Canting Of Moments Research Articles

Spin and orbital magnetism by light in rutile altermagnets

While the understanding of altermagnetism is still at a very early stage, it is expected to play a role in various fields of condensed matter research, for example spintronics, caloritronics and superconductivity. In the field of optical magnetism, it is still unclear to which extent altermagnets as a class can exhibit a distinct behavior. Here we choose RuO2, a prototype metallic altermagnet with a giant spin splitting, and CoF2, an experimentally known insulating altermagnet, to study the light-induced magnetism in rutile altermagnets from first-principles. We demonstrate that in the non-relativisic limit the allowed sublattice-resolved orbital response exhibits symmetries, imposed by altermagnetism, which lead to a drastic canting of light-induced moments. On the other hand, we find that inclusion of spin-orbit interaction enhances the overall effect drastically, introduces a significant anisotropy with respect to the light polarization and strongly suppresses the canting of induced moments. Remarkably, we observe that the moments induced by linearly-polarized laser pulses in light altermagnets can even exceed in magnitude those predicted for heavy ferromagnets exposed to circularly polarized light. By resorting to microscopic tools we interpret our results in terms of the altermagnetic spin splittings and of their reciprocal space distribution. Based on our findings, we speculate that optical excitations may provide a unique tool to switch and probe the magnetic state of rutile altermagnets.

Theoretical description of the thermodynamic properties and the magnetocaloric effect in R2Cu2Cd (R = Dy,Ho)

In this paper, we present a theoretical discussion of the magnetocaloric effect in the compounds Dy2Cu2Cd and Ho2Cu2Cd whose curves of the heat capacity and isothermal entropy change exhibit two peaks. For this purpose, we use a model Hamiltonian of local magnetic moments with two anisotropic magnetic sublattices. In the model, it is considered that exchange interactions between magnetic moments depend on their xyz components. Besides, it is also included in the model a single ion uniaxial anisotropy and the Dzyaloshinskii-Moriya interaction to account for the canted magnetic moments. Our theoretical calculations show that the existence of these two peaks is associated with a spin reorientation transition at a lower temperature and a ferromagnetic-paramagnetic one at a higher temperature. The results of our theoretical calculations are in reasonable agreement with the existing experimental data of heat capacity and the isothermal entropy change.

Crystal growth, magnetic and electrical transport properties of the kagome magnet RCr6Ge6 (R = Gd–Tm)

Abstract Kagome magnets have attracted considerable research attentions due to the interplay between topology, magnetism and electronic correlations. In this study, we report single crystal synthesis of a series of the kagome magnets RCr6Ge6 (R = Gd - Tm) which possess defect-free Cr kagome lattices, and systematically study their magnetic and electrical transport properties. The transition from canted ferrimagnetic to paramagnetic state in GdCr6Ge6, TbCr6Ge6, DyCr6Ge6, HoCr6Ge6, ErCr6Ge6, and TmCr6Ge6 occurs at 11.3 K, 10.8 K, 4.3 K, 2.5 K, 3.3 K, and below 2 K, respectively, due to R-R interactions within the compounds. Magnetization measurements reveal highly anisotropic magnetism with canted magnetic moments in these compounds. In the electrical transport, both negative and positive magnetoresistance at different magnetic field and temperature have been observed due to the competition between different scattering mechanisms. Our work enriches understandings on the Cr-based kagome magnets and paves way for searching possible topological responses in this family.

Spin-torque-driven antiferromagnetic resonance.

The intrinsic fast dynamics make antiferromagnetic spintronics a promising avenue for faster data processing. Ultrafast antiferromagnetic resonance-generated spin current provides valuable access to antiferromagnetic spin dynamics. However, the inverse effect, spin-torque-driven antiferromagnetic resonance (ST-AFMR), which is attractive for practical utilization of fast devices but seriously impeded by difficulties in controlling and detecting Néel vectors, remains elusive. We observe ST-AFMR in Y3Fe5O12/α-Fe2O3/Pt at room temperature. The Néel vector oscillates and contributes to voltage signal owing to antiferromagnetic negative spin Hall magnetoresistance-induced spin rectification effect, which has the opposite sign to ferromagnets. The Néel vector in antiferromagnetic α-Fe2O3 is strongly coupled to the magnetization in Y3Fe5O12 buffer, resulting in the convenient control of Néel vectors. ST-AFMR experiment is bolstered by micromagnetic simulations, where both the Néel vector and the canted moment of α-Fe2O3 are in elliptic resonance. These findings shed light on the spin current-induced dynamics in antiferromagnets and represent a step toward electrically controlled antiferromagnetic terahertz emitters.

Effect of Partial Replacement of Mn with Cr on Exchange Bias Behavior and Negative Magnetization in Nanocrystalline Ho2CoMnO6 Double Perovskite

In the present work, we have reported a detailed study on the structural and magnetic properties of Ho2CoMn1-xCrxO6 (x = 0–0.5) double perovskite. Rietveld analysis of observed x-ray diffraction patterns revealed that the examined samples are crystallized in the P21/n space group with a monoclinic structure. With Cr substitution, the lattice parameters got reduced. The particle size is also observed to be decreased. Magnetic analysis reveals a single ferromagnetic (FM) transition (TC1) at 83 K for x ≤ 0.2. It is attributed to the superexchange interaction in Co2+ - O2− - Mn4+ networks. Whereas, for x ≥ 0.3, we observed two transitions namely TC1 and TC2. Here TC2 is attributed to the result of antiferromagnetic (AFM) interactions in Cr3+- O2− - Cr3+ and/or Cr3+- O2− - Mn4+ networks. TC2 decreases from 77 K for x = 0.3 to 63 K for x = 0.5 sample, whereas no appreciable variation in TC1 is observed. In addition, the intermediate compounds such as x = 0.2 and 0.4 show another transition at 120 K and is attributed to the charge ordering temperature (TCO). Magnetization reversal (MR) has been observed in x = 0.5 at a lower applied field with a compensation temperature of 7 K. The competition between the paramagnetic (PM) moment of Ho3+/Mn3+ ions under the influence of the negative internal field caused by AFM ordered ions and the FM components of Co2+ and Mn4+ ions is attributed to this MR. At 4 K, a bipolar switching of magnetization is demonstrated for x = 0.5. After Cr substitution, the hysteresis (M−H) loops show a decrease in saturation magnetization (MS) and coercivity (Hc). Exchange bias field of − 114 Oe and + 208 Oe are observed for x = 0.0 and 0.5 samples respectively. They are attributed to the competition between canted magnetic moments of RE ions and FM moments of TM ions, where, the former one is dominating for x = 0.5 and vice versa for x = 0.0 samples.

High pressure effects on magnetic states of elemental holmium

The pressure response of the magnetic and structural properties of elemental holmium was explored by means of neutron powder diffraction in the pressure range up to 8.7 GPa and the temperature range 7 – 290 K. At ambient pressure, below TN = 127 K the incommensurate helical state with a propagation vector q = (0 0 qz) is evidenced. On temperature lowering, the qz value decreases from 0.270c* (at 125 K) to 5/26c* at TL = 20 K. Below the lock-in transition temperature TL, a commensurate cone structure is formed due to canting of magnetic moments towards the c axis. Upon lattice compression, a gradual suppression of the low temperature cone structure was found and just a helical state was observed above 4 GPa. This state is incommensurate in the temperature range TL < T < TN and becomes commensurate below TL. At T = 7 K, the qz component evolves towards ¼ c* value at 8.7 GPa. The Néel temperature decreases to 108 K with a pressure increase up to 8.7 GPa with a pressure coefficient dTN/dP ≈ −2.2 K/GPa, while the lock-in transition temperature exhibits opposite behavior and grows up to about 50 K with a coefficient of dTL/dP ≈ 3.4 K/GPa. The magnetic P-T phase diagram of Ho is constructed. The compression of Ho lattice at T = 7 K is nearly isotropic, as found from about the same compressibilities of the a and c axes.

Observation of c -axis magnetization at low temperatures in the weak ferromagnet FeBO3 reveals a spin-reorientation transition

The weak ferromagnet $\mathrm{Fe}{\mathrm{BO}}_{3}$ is well known for being a unique system for modeling and testing magnetic dynamics primarily due to relatively simple and localized magnetic structure and its interesting spin wave dynamics. At room temperature, it has slightly canted iron moments lying in the $a\text{\ensuremath{-}}b$ plane that result in a strong antiferromagnetic moment and a weak ferromagnetic moment, which results in pronounced ferromagnetic and antiferromagnetic spin modes. However, some previous studies have shown unusual low-temperature behavior that suggests a phase transition. By performing low-temperature magnetization measurements, both in bulk and on the mesoscale, we have observed a low-temperature magnetic texture in this material in which a large $c$-axis magnetization occurs. Magnetic fields along the $c$ axis as high as 1300 Oe were observed close to the sample's surface. This presents evidence for the onset of a Morin transition or another type of spin-reorientation phase transition wherein the ${\mathrm{Fe}}^{3+}$ moments would acquire a $c$-axis component to their canting below a critical temperature. The observation of this $c$-axis magnetization suggests that there is a different ground state in this material than has been previously expected and could be due to as yet unexplored intricacies of the Dzyaloshinskii-Moriya interaction.

Current-induced switching of thin film α−Fe2O3 devices imaged using a scanning single-spin microscope

Electrical switching of N\'eel order in an antiferromagnetic insulator is desirable as a basis for memory applications. Unlike electrically driven switching of ferromagnetic order via spin-orbit torques, electrical switching of antiferromagnetic order remains poorly understood. Here we investigate the low-field magnetic properties of 30-nm-thick, $c$-axis-oriented $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ Hall devices using a diamond nitrogen-vacancy center scanning microscope. Using the canted moment of $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ as a magnetic handle on its N\'eel vector, we apply a saturating in-plane magnetic field to create a known initial state before letting the state relax in low field for magnetic imaging. We repeat this procedure for different in-plane orientations of the initialization field. We find that the magnetic field images are characterized by stronger magnetic textures for fields along $[\overline{1}\overline{1}20]$ and $[11\overline{2}0]$, suggesting that despite the expected 3-fold magnetocrystalline anisotropy, our $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ thin films have an overall in-plane uniaxial anisotropy. We also study current-induced switching of the magnetic order in $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$. We find that the fraction of the device that switches depends on the current pulse duration, amplitude, and direction relative to the initialization field.

Composition‐Dependent Ferroelectricity of LuFeO3 Orthoferrite Thin Films

AbstractThis work characterizes the structural, magnetic, and ferroelectric properties of epitaxial LuFeO3 orthoferrite thin films with different Lu/Fe ratios. LuFeO3 thin films are grown by pulsed laser deposition on SrTiO3 substrates with Lu/Fe ratio ranging from 0.6 to 1.5. LuFeO3 is antiferromagnetic with a weak canted moment perpendicular to the film plane. Piezoresponse force microscopy imaging and switching spectroscopy reveal room temperature ferroelectricity in Lu‐rich and Fe‐rich films, whereas the stoichiometric film shows little polarization. Ferroelectricity in Lu‐rich films is present for a range of deposition conditions and crystallographic orientations. Positive‐up‐negative‐down ferroelectric measurements on a Lu‐rich film yield ≈13 µC cm−2 of switchable polarization, although the film also shows electrical leakage. The ferroelectric response is attributed to antisite defects analogous to that of Y‐rich YFeO3, yielding multiferroicity via defect engineering in a rare earth orthoferrite.

Antiferromagnetic spin canting and magnetoelectric multipoles in h−YMnO3

Hexagonal ${\mathrm{YMnO}}_{3}$ is a prototype antiferromagnet which exhibits multiferroic behavior with the ferroelectric and magnetic transitions occurring at different temperatures. We observe an out-of-plane canting of the ${\mathrm{Mn}}^{3+}$ magnetic moments using resonant x-ray diffraction (RXD) in a single crystal of this material. These canted moments result in the symmetry-forbidden (0,0,1) magnetic Bragg reflection, which is observed at the Mn ${L}_{2,3}$ absorption edges. We also observe an unexpected difference in the RXD spectral shapes at different temperatures. Using ab initio calculations, we explore the possibility that this behavior arises due to the interference between scattering from the canted magnetic moments and parity-odd atomic multipoles on the ${\mathrm{Mn}}^{3+}$ ions.

A Room-Temperature Spin-Valve with van der Waals Ferromagnet Fe5 GeTe2 /Graphene Heterostructure.

The discovery of van der Waals (vdW) magnets opened a new paradigm for condensed matter physics and spintronic technologies. However, the operations of active spintronic devices with vdW ferromagnets are limited to cryogenic temperatures, inhibiting their broader practical applications. Here, the robust room-temperature operation of lateral spin-valve devices using the vdW itinerant ferromagnet Fe5 GeTe2 in heterostructures with graphene is demonstrated. The room-temperature spintronic properties of Fe5 GeTe2 are measured at the interface with graphene with a negative spin polarization. Lateral spin-valve and spin-precession measurements provide unique insights by probing the Fe5 GeTe2 /graphene interface spintronic properties via spin-dynamics measurements, revealing multidirectional spin polarization. Density functional theory calculations in conjunction with Monte Carlo simulations reveal significantly canted Fe magnetic moments in Fe5 GeTe2 along with the presence of negative spin polarization at the Fe5 GeTe2 /graphene interface. These findings open opportunities for vdW interface design and applications of vdW-magnet-based spintronic devices at ambient temperatures.

Perfect kagome-lattice antiferromagnets with Jeff=12 : The Co2+ analogs of the copper minerals volborthite and vesignieite

We report the synthesis, crystal structure, and magnetic properties of Co$^{2+}$ kagome magnets Co$_3$V$_2$O$_7$(OH)$_2$$\cdot$2H$_2$O and BaCo$_3$(VO$_4$)$_2$(OH)$_2$, which can be recognized as Co-analogues of the intensively researched quantum kagome magnet volborthite Cu$_3$V$_2$O$_7$(OH)$_2$$\cdot$2H$_2$O and vesignieite BaCu$_3$(VO$_4$)$_2$(OH)$_2$. For each compound, the ground state is seemingly A-type antiferromagnetic order. At low temperatures, applying a magnetic field causes a metamagnetic-like transition described by the transition in which antiferromagnetically-aligned canted moments change to ferromagnetically-aligned ones. These ground and field-induced states include a canted ferromagnetic component perpendicular to the kagome planes favored by Dzyaloshinskii-Moriya interactions. These magnetic properties are well characterized by the J$_{eff}$ = 1/2 physics. Our findings will be the first step toward clarifying the J$_{eff}$ = 1/2 kagome physics, which has been little studied experimentally or theoretically.

Unraveling the origin of the peculiar transition in the magnetically ordered phase of the Weyl semimetal Co3Sn2S2

Recent discovery of topologically non-trivial behavior in Co3Sn2S2 stimulated a notable interest in this itinerant ferromagnet (Tc = 174 K). The exact magnetic state remains ambiguous, with several reports indicating the existence of a second transition in the range 125 -- 130 K, with antiferromagnetic and glassy phases proposed to coexist with the ferromagnetic phase. Using detailed angle-dependent DC and AC magnetization measurements on large, high-quality single crystals we reveal a highly anisotropic behavior of both static and dynamic response of Co3Sn2S2. It is established that many observations related to sharp magnetization changes when B || c are influenced by the demagnetization factor of a sample. On the other hand, a genuine transition has been found at Tp = 128 K, with the magnetic response being strictly perpendicular to the c-axis and several orders of magnitude smaller than for B || c. Calculations using density-functional theory indicate that the ground state magnetic structure consist of magnetic moments canted away from the c-axis by a small angle (~ 1.5deg). We argue that the second transition originates from a small additional canting of moments within the kagome plane, with two equivalent orientations for each spin.

Probing the spin-phonon coupling through Raman spectroscopy in Pb(Fe1/2Nb1/2)O3 – Pb(Co1/3Nb2/3)O3 ceramics

We report on the spin-phonon coupling in (1-x)Pb(Fe1/2Nb1/2)O3 – (x)Pb(Co1/3Nb2/3)O3 (PFCN, x = 0.1–0.5) ceramics by noticing changes in the phonon modes around the magnetic phase transition (TN) in the temperature-dependent Raman spectroscopy. A huge bifurcation was found between MZFC and MFC curves, revealing the existence of strong magnetic anisotropy in all the ceramics. Variations in TN are due to the coexistence of antiferromagnetic and ferromagnetic interactions through Fe–O–Fe, Co–O–Co, Fe–O–Co canted magnetic moments. The Tg is due to the superexchange interaction among Fe/Co–O–Nb–O–Co/Fe paths formed by the local short-range chemical ordering of Fe, Co, and Nb ions. The Raman spectra, recorded over a wide range of temperatures, reveal some anomalies in B–O–B bending and O–B–O stretching modes in the vicinity of TN, corresponding to the spin-phonon coupling in all the ceramics. This evidences the existence of magnetoelectric coupling in all the PFCN ceramics. Room temperature Mössbauer spectra of x = 0.1, 0.3 and 0.5 revealed the paramagnetic nature. Electron paramagnetic resonance (EPR) spectra showed the existence of antiferromagnetic and ferromagnetic orderings in all the ceramics.

Magnetic nanoprecipitates and interfacial spin disorder in zero-field-annealed Ni50Mn45In5 Heusler alloys as seen by magnetic small-angle neutron scattering.

Shell ferromagnetism is a new functional property of certain off-stoichiometric Ni-Mn-In Heusler alloys, with a potential application in non-volatile magnetic memories and recording media. One key challenge in this field remains the determination of the structural and magnetic properties of the nanoprecipitates that are the result of an annealing-induced segregation process. Thanks to its unique mesoscopic length scale sensitivity, magnetic small-angle neutron scattering appears to be a powerful technique to disclose the microstructure of such annealing-induced nanoprecipitates. In this study, the microstructure of a zero-field-annealed off-stoichiometric Ni50Mn45In5 Heusler alloy is investigated by unpolarized magnetic small-angle neutron scattering. The neutron data analysis reveals a significant spin-misalignment scattering, which is mainly related to the formation of annealing-induced ferromagnetic nanoprecipitates in an antiferromagnetic matrix. These particles represent a source of perturbation which, due to dipolar stray fields, gives rise to canted spin moments in the surroundings of the particle-matrix interface. The presence of anticorrelations in the computed magnetic correlation function reflects the spatial perturbation of the magnetization vector around the nanoprecipitates. The magnetic field dependence of the zero crossing and the minima of the magnetic correlation function are qualitatively explained using the law of approach to ferromagnetic saturation for inhomogeneous spin states. More specifically, at remanence, the nanoprecipitates act magnetically as one superdefect with a correlation length that lies outside the experimental q range, whereas near saturation the magnetization distribution follows each individual nanoprecipitate. Analysis of the neutron data yields an estimated size of 30 nm for the spin-canted region and a value of about 75 nm for the magnetic core of the individual nanoprecipitates.

Negative Magnetization and Exchange Bias Behavior in Nanocrystalline Ho2CoMn1−xNixO6 (x=0‐0.4) Double Perovskite

A gel combustion method is opted to prepare nanocrystalline samples of Ho2CoMn1−xNixO6 (x = 0–0.4) (HCMNO) double perovskite. Structural studies reveal a formation of nanocrystalline samples, which crystallize into monoclinic structure with space group P21/n. A drop in the lattice parameters including unit cell volume are noticed with Ni substitution. Magnetization versus temperature (M-T) analysis shows a single FM transition in the parent compound at 83 K (TC1) and it is ascribed to the super exchange interaction in Co2+ - O2- - Mn4+ networks. However, it is turned into two FM transitions (TC1, TC2) after Ni substitution, where TC2 arises due to possible super exchange interaction in Co2+ - O2- - Ni4+ networks. The transition temperature TC1, is decreasing from 83 to 76 K for x = 0.0–0.4 sample, whereas TC2 increases up to 88 K for x = 0.4 sample. A magnetization reversal (MR) has been observed in higher Ni concentration (x = 0.3 and 0.4) samples in the field cooled state with a compensation temperature (Tcomp) of 4.4 K and 10 K respectively. This MR is attributed to the competition between the ferromagnetic (FM) moment of the transition metal (TM) ions and the polarization of magnetic moments of rare-earth (RE) ions at low temperatures. A typical bipolar switching of magnetization has been demonstrated for x = 0.3 and 0.4 sample. At 5 K, the hysteresis (M-H) loops demonstrate a decrease in saturation magnetization (MS) and coercivity (Hc) value after Ni substitution. However, the observed MS of the order of 11.60–10.27 µB/f.u. (for x = 0.0–0.4) at 5 K is attributed to some visible contribution related to the polarization/ordering of Ho moment with the net magnetic moment of TM ions. A maximum exchange bias field value of 230 Oe has been observed at 5 K for x = 0.4 sample. It is due to the competition between the spin canted magnetic moments of RE ions and the FM moments of TM ions.

Effect of interlayer Dzyaloshinskii-Moriya interaction on spin structure in synthetic antiferromagnetic multilayers

Chiral magnetism defines the spin structure sense of rotation in magnetic films and stabilized by the interfacial Dzyaloshiniskii-Moriya interaction (DMI), which can be used to generate the chiral nature of magnetic textures like spin spirals and skyrmions. Here, the direct evidence of the interlayer DMI was observed at room temperature, by designing the synthetic system with a ferromagnet/insulating spacer/ferromagnet structure whose magnetic chirality can be effectively manipulated between ferromagnetic coupling and antiferromagnetic coupling by changing spacer thickness. The interlayer DMI breaks the symmetry of the magnetic reversal process, leading to chiral exchange-biased Hall loops, where the noncollinear magnetic states were systematically characterized and quantified by using polarized neutron reflectometry (PNR). PNR results indicate that the maximum angle of the canted magnetic moments for ferromagnetic coupling can reach as high as $11.5{}^{\ensuremath{\circ}}$, which is stronger than that for antiferromagnetic coupling, suggesting the higher energy excitation of magnetic chirality. This canted spin structure is verified by first-principles calculation. Our findings should be greatly useful for the interfacial design of spintronic devices to control and tailor the magnetic chirality for the formation of the spin texture in high-density memory.

Origin of the type-II Weyl state in topological antiferromagnetic YbMnBi2

Recently, the topological nature of an antiferromagnet YbMnBi2 has been controversial. YbMnBi2 is regarded as a candidate of Type-II Weyl semimetals with magnetic moments of Mn atoms canting about 10{\deg} in some studies but as a Dirac semimetal without canting in others. By means of systematical density functional theory calculations, we show the perfect YbMnBi2 bulk has a collinear antiferromagnetic ordering and, naturally, it is a Dirac semimetal. Considering the vital role of magnetic moment canting in generating the Type-II Weyl state, we artificially cant the magnetic moments of Mn atoms and find that YbMnBi2 enters into the Type-II Weyl state from about 2{\deg}. Inspired by this and taking into account the possible defects in experiments, we suggest that Bi vacancies in Mn-Bi-Mn bonds, which produce sizable Dzyaloshinskii-Moriya interactions and thereby cant the magnetic moments of Mn atoms, can tune the topological nature of YbMnBi2 from Dirac semimetals to Type-II Weyl semimetals. Our work unveils the possible underlying mechanism for the Type-II Weyl state in YbMnBi2, providing insights into the Weyl state in other magnetic topological materials.

Structural and Magnetic Properties of Thin-film ScFeO₃

Structural and magnetic properties of ScFeO₃ compound were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy, and vibrating sample magnetometry (VSM) in comparison with those of Fe₂O₃ and Sc₂O₃. The specimens were prepared as thin films under identical sol-gel deposition process. The XRD data indicated that the ScFeO₃ specimen have cubic bixbyite structure, identical to that of the Sc₂O₃ specimen but different from that of the Fe₂O₃ specimen (rhombohedral). The estimated lattice constant of ScFeO₃ is smaller than that of Sc₂O₃ by 2.9 %. According to the VSM data, the ScFeO₃ specimen showed a magnetic hysteresis curve that is alike in shape to that of the Fe₂O₃ specimen with the saturation magnetization of the former (2.6 emu/㎤) being smaller by 30 % than that of the latter (3.7 emu/㎤). The observed small magnetization in ScFeO₃ implies an antiferromagnetic spin alignment of neighboring FeSUP3+/SUP ions with canted spin magnetic moment.

Temperature-driven spin switching and exchange bias in the ErFeO3 ferrimagnet

The compensated ferrimagnet orthoferrite $\mathrm{ErFe}{\mathrm{O}}_{3}$ exhibits the exchange bias (EB) effect, which was previously detected as the traditional shift of the magnetization hysteresis loops $M$ vs $H$ near the compensation temperature ${T}_{\mathrm{comp}}=45\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. This paper shows that another specific phenomenon, temperature-driven spin switching and exchange bias, occurs in this ferrimagnet. Namely, the EB manifests itself as the temperature shift of the hysteresis loops $M$ vs $T$, which occurs upon successive cooling and heating in a weak magnetic field. The $M$ vs $T$ loops limiting the region of coexistence of negative and positive magnetization are shifted towards lower or higher temperatures, depending on the sign of the applied magnetic field, which causes the unidirectional EB anisotropy. The EB anisotropy energy, which contributes to the energy barrier for switching spins to an equilibrium state, determines the shift in the switching temperature ${T}_{\mathrm{sw}}$. Exchange-biased spin switching in $\mathrm{ErFe}{\mathrm{O}}_{3}$ is discussed within a model, which explains the magnetic compensation of the canted ferromagnetic moment of the ${\mathrm{Fe}}^{3+}$ spins and the opposite moment of paramagnetic ${\mathrm{Er}}^{3+}$ spins induced by the antiferromagnetic exchange interaction between the Er and Fe ions.