Spin Reorientation Transition Research Articles

Threefold spin reorientation transition and field induced spin switching in rare earth doped single crystal Dy0.75Nd0.25FeO3

We report a single crystal of Dy0.75Nd0.25FeO3 by optical floating zone method. This well-grown single crystal displays threefold spin reorientation transition from Γ4 (GxAyFz) to a mix state of Γ4 and Γ2 (FxCyGz), then to Γ1 (AxGyCz), finally to Γ2 (FxCyGz) below 30 K. The phenomenon of threefold spin reorientation transition has not reported in rare earth orthoferrites, even barely in other compounds with spin reorientation transition. Besides, this bulk single crystal also displays a field induced spin switching transition. These distinguished responses in the single crystal present an opportunity to future application in magnetic devices of the emerging field of spintronics.

Magnetic structure and properties of Ca, Mn-doped bismuth ferrites near the polar/nonpolar phase boundary

Neutron diffraction and magnetization measurements of the Bi0.85Ca0.15Fe1-xMnxO3+δ (x = 0.4, 0.5) compounds have been performed at room and low temperatures to disclose the effect of the mixed-valence Mn substitution on the magnetic structure and properties of the Ca-doped bismuth ferrites near the polar/nonpolar phase boundary. It has been confirmed that the Mn substitution results in the filling of anion vacancies produced by the aliovalent replacement of Bi3+ by Ca2+. The Bi0.85Ca0.15Fe0.6Mn0.4O3+δ compound has the acentric structure specific to the pure BiFeO3 (space group R3c) and displays a G-type antiferromagnetic order at room temperature (m300K = 1.35(2) μB). The magnetic moments localized on the Fe/Mn ions are directed along the polar axis. The spin-reorientation transition from the c to a axis takes place with decreasing temperature. An increase in the Mn concentration gives rise to the polar → nonpolar (R3c → Pnma) structural phase transformation. The nonpolar (x = 0.5) compound has a G-type antiferromagnet structure (TN = 210 K) with spins aligned along the orthorhombic b axis. The low-temperature magnetic moments (m5K = 2.67(2) μB and m5K = 1.80(3) μB for the samples with x = 0.4 and x = 0.5, respectively) are considerably smaller than those predicted for complete spin ordering of the interacting ions of Fe3+, Mn3+ and Mn4+ (>4 μB). While the neutron diffraction measurements reveal no contribution associated with a long-range ferromagnetic order at T = 5 K, a significant increase in the magnetization of the samples, suggesting the formation of a glassy phase, is observed with decreasing temperature.

Magnetocaloric properties and unconventional critical behavior in (Gd,Tb)6(Fe,Mn)Bi2 intermetallics

The magnetic and magnetocaloric properties of the intermetallic family (Gd,Tb)6(Fe,Mn)Bi2 have been studied from 2 K to temperatures above the respective Curie temperatures TC. The substitution of Gd by Tb (Gd6FeBi2, Gd3Tb3FeBi2, Tb6FeBi2) tunes TC in the range 350-250 K and favors the apparition of a metamagnetic transition at very low temperature (below 10 K) from a complex magnetic state to a ferromagnetic one, as well as a spin reorientation transition below Tm = 72 K. As a consequence, an important inverse magnetocaloric effect (IMCE) appears below 20 K and an interesting direct magnetocaloric effect (DMCE) appears over a wide temperature span between TC and Tm with maxima at those temperatures. The partial substitution of Fe by Mn in Tb6Fe0.5Mn0.5Bi2 shifts these effects upwards in temperature while expanding the region of the direct magnetocaloric effect between 70 and 400 K. The combination of adjoint IMCE and DMCE as well as the wide span of the latter shows that tuning this family allows to locate the magnetocaloric effect in different regions of interest. The critical behavior of the PM-FM transitions has been studied obtaining the critical exponents α, β, γ, δ and checking that the respective magnetocaloric effects also scale with the critical parameters n and δ. The transition in Gd6FeBi2 belongs to the Heisenberg universality class with deviations due to magnetocrystalline anisotropies; the critical exponents for Gd3Tb3FeBi2 (in agreement with the Mean Field model) suggest the presence of long range order magnetic interactions, while Tb6FeBi2 and Tb6Fe0.5Mn0.5Bi2 present an unconventional critical behavior aligned with long range order interactions.

Evolution of cation and spin orders in the double–double-double perovskite series CaxMn2−xFeReO6

Variations of perovskite superstructure type and magnetic properties across the high-pressure ${\mathrm{Ca}}_{x}{\mathrm{Mn}}_{2\ensuremath{-}x}{\mathrm{FeReO}}_{6}$ series have been investigated by powder neutron-diffraction, x-ray magnetic circular dichroism, and magnetization measurements. Monoclinic $P{2}_{1}/n\phantom{\rule{0.16em}{0ex}}{A}_{2}B{B}^{\ensuremath{'}}{\mathrm{O}}_{6}$ double perovskite solid solutions with rocksalt-type ordering of $B/{B}^{\ensuremath{'}}\text{\ensuremath{-}}\mathrm{Fe}/\mathrm{Re}$ cations but no $A$-cation order are discovered to exist only close to the end members $0lxl0.17$ and $1.73lxl2$. Compositions in the range $0.74lxl\ensuremath{\sim}1.1$ adopt a tetragonal $P{4}_{2}/n\phantom{\rule{0.16em}{0ex}}A{A}^{\ensuremath{'}}B{B}^{\ensuremath{'}}{\mathrm{O}}_{6}$ double-double perovskite phase based on ${\mathrm{CaMnFeReO}}_{6}$, which has both columnar $A/{A}^{\ensuremath{'}}\text{\ensuremath{-}}\mathrm{Ca}/\mathrm{Mn}$ and rocksalt $B/{B}^{\ensuremath{'}}\text{\ensuremath{-}}\mathrm{Fe}/\mathrm{Re}$ cation orders. Two-phase coexistence of double and double-double perovskites occurs over wide regions between these limits. All samples are ferrimagnetic with Curie temperatures near 500 K. Low-temperature Mn spin order is also observed in the Mn-rich double perovskites and the double-double perovskites. Spin reorientation transitions observed across all of the double perovskites are shown to result from $5{d}^{2}\phantom{\rule{4pt}{0ex}}{\mathrm{Re}}^{5+}$ orbital ordering, but this does not occur in the double-double perovskites. The Ca-rich double perovskites show significant magnetic coercivity at low temperatures.

Spin-phonon coupling in Mn-Bi co-doped SmFeO3: An experimental study

The intriguing physical properties of SmFeO3 such as spin-phonon coupling and spin reorientation transition (~480 K) make it interesting from fundamental point of view and a suitable candidate for oxide-based spintronic applications. Here, we have studied the temperature dependent structural, vibrational, and magnetic properties of polycrystalline Sm0.9Bi0.1Fe0.9Mn0.1O3 prepared by conventional solid-state reaction method. The compound stabilizes in orthorhombic structure with space group “Pnma” and exhibits no structural phase transitions in the investigated temperature range (300–500 K). Magnetic measurements reveal the weak ferromagnetic–paramagnetic transition at 620 K. Thermal evolution of phonon modes investigated using Raman spectroscopy in the temperature range 300–800 K reveal that Ag(3) phonon mode related to FeO6 vibrations exhibits anomalous behaviour below magnetic transition temperature, which we attribute to spin-phonon coupling. The optical band gap value of ∼ 5.17 eV has been estimated from the analysis of UV–Vis diffuse reflectance spectroscopy using the Tauc relation. The value of ΔEt2u→t2g is estimated to be ~ 2.6 eV for p-d charge transfer transitions in Fe/MnO6 octahedra. The obtained valence states from X-ray photoelectron spectroscopy analysis of all the elements of the sample are in excellent agreement with the expected values.

Magnetocaloric effect and spin-phonon correlations in RFe0.5Cr0.5O3 (R = Er and Yb) compounds

We report the results of our investigation of the physical properties of mixed metal oxides RFe0.5Cr0.5O3 (R = Er and Yb). ErFe0.5Cr0.5O3 undergoes an antiferromagnetic ordering around 270 K followed by spin reorientation (SR) transitions around 150 and 8 K respectively. In contrast, in YbFe0.5Cr0.5O3 a single SR transition is noted at 36 K, below the AFM ordering temperature of 280 K. In ErFe0.5Cr0.5O3, a significant value of magnetic entropy change (ΔSM) ∼ -12.4 J/kg-K is noted near the 2nd SR transition, however, this value is suppressed in YbFe0.5Cr0.5O3. Temperature dependent dielectric permittivity of ErFe0.5Cr0.5O3 and YbFe0.5Cr0.5O3 at different frequencies, reveal the presence of Debye-like relaxation behaviour in both compounds, which can be due to the effect of charge carrier hopping between localized states of Fe and Cr ions. Temperature dependent Raman scattering studies divulge that spin-phonon coupling plays a crucial role in defining the physical properties of these compounds.

The negative magnetization and dielectric relaxation in (La0.3Pr0.7)1-xCaxCrO3 ceramics

The (La0.3Pr0.7)1-xCaxCrO3 (x = 0, 0.1, 0.3 and 0.5) ceramics have been synthesized by a sol-gel method. The compounds crystalize in orthorhombic structure with space group Pnma at room temperature. The magnetic measurements confirm that the materials form canted antiferromagnetic (AFM) ordering from 254.1, 231.2, 118.5, 49.3 K for the samples of x = 0, 0.1, 0.3 and 0.5, accompanied by a spin reorientation transition at 191.4, 145.1, 55.8, 38.9 K because of the Pr3+-Cr3+ interaction. Meanwhile, a positive exchange bias effect is observed due to the antiparallel coupling between the Pr3+ and the canted AFM structure of Cr3+. The Néel temperature, compensation temperature as well as the coupling strength of Pr3+-Cr3+ monotonously decrease with the increase of Ca2+ concentration. For the samples of x = 0.1 and 0.3, there exists a field induced Pr3+-Pr3+ AFM ordering. By means of dielectric measurements, large permittivity at room temperature and dielectric relaxation are observed in all the samples. The permittivity is decreased and dielectric relaxation moves to low temperature range with the increase of Ca2+ concentration. A relaxor-like ferroelectric transition is observed in the measuring temperature range in Ca2+ doped samples.

Control of spin orientation in antiferromagnetic NiO by epitaxial strain and spin–flop coupling

A ferromagnet/antiferromagnet (FM/AFM) Fe/NiO bilayer was grown using molecular beam epitaxy on MgO(001) and Cr buffered MgO(001) substrates. X-ray linear dichroism measurements showed a dominating out-of-plane component for the NiO spins in Fe/NiO/MgO and an in-plane spin direction for NiO layers grown on the Cr buffer. Furthermore, systematic studies on the magnetic properties of Fe/NiO grown on the wedge-shaped Cr buffer revealed a continuous strain-induced spin reorientation transition from out-of-plane to in-plane NiO spin directions when the Cr thickness increased from 0 nm to 3.5 nm. The analysis of the in-plane magnetic structure of NiO in Fe/NiO/Cr showed a pronounced uniaxial anisotropy in thin AFM layers. The AFM spins are perpendicular to the Fe spins due to spin–flop interaction. These results demonstrate the feasibility of using strain and coupling with FMs to manipulate spin structures in NiO.

Noise characterization of ultrasensitive anomalous Hall effect sensors based on Co40Fe40B20 thin films with compensated in-plane and perpendicular magnetic anisotropies

We have performed magnetotransport and noise characterization studies of ultrasensitive anomalous Hall effect (AHE) sensors based on the Ta/Co40Fe40B20/MgO multilayer structure. The magnetization is near spin reorientation transition. This greatly reduces the saturation field with improvement of the magnetic sensing performance. We have performed temperature-dependent measurements to investigate the effect of tunable magnetic anisotropy. Both 1/f noise and sensitivity have a strong temperature dependence. Moreover, the scaling relations between 1/f noise and sensitivity change dramatically as temperature changes, showing different noise originations depending on magnetic anisotropies. With a small sensing area of 20×20 μm2, the best magnetic field detectability reaches 76 nT/Hz at 1 Hz and 2 nT/Hz at 10 kHz. AHE sensors with compensated magnetic anisotropies are, thus, suitable for ultrasensitive magnetic field sensing applications.

Magnetic properties of rare-earth and transition metal based perovskite type high entropy oxides

High entropy oxides (HEOs) are a recently introduced class of oxide materials, which are characterized by a large number of elements (i.e., five or more) sharing one lattice site, which crystallize in a single phase structure. One complex example of the rather young HEO family is the rare-earth transition metal perovskite high entropy oxides. In this comprehensive study, we provide an overview of the magnetic properties of three perovskite type high entropy oxides. The compounds have a rare-earth site that is occupied by five different rare-earth elements, while the transition metal site is occupied by a single transition metal. In this way, a comparison to the parent binary oxides, namely, the orthocobaltites, -chromites, and -ferrites, is possible. X-ray absorption near edge spectroscopy, magnetometry, and Mössbauer spectroscopy are employed to characterize these complex materials. In general, we find surprising similarities to the magnetic properties of the binary oxides despite the chemical disorder on the rare-earth site. However, distinct differences and interesting magnetic properties are also observed such as noncollinearity, spin reorientation transitions, and large coercive fields of up to 2 T at ambient temperature. Both the chemical disorder on the rare-earth A-site and the nature of the transitional metal on the B-site play an important role in the physical properties of these high entropy oxides.

The unusual spin reorientation transition and exchange bias effect in Er0.6Dy0.4FeO3 single crystal

In this work, the single crystal Er0.6Dy0.4FeO3 (EDFO) was grown using optical floating-zone method. The magnetic behaviors of single crystal EDFO at low temperatures were systematically investigated. With lowering temperatures, an unusual spin reorientation transition could be observed. The transition was reasonably speculated as Γ3 (Cx, Fy, Az) → Γ4 (Gx, Ay, Fz). Exchange bias effect could be found in the magnetization hysteresis loops, revealing the relationship of interaction between Fe3+ and R3+ (Dy3+ and Er3+) sublattices in EDFO single crystal. Additionally, when the magnetic field along the a-axis increased to 70 kOe, the magnetic phase transition took place at around 40 K, suggesting that an external field can trigger spin reorientation transition along a special axis. The features in single crystal EDFO have a significant potential in material physics and device application and provide insight into the magnetic structure and exchange bias for RFeO3 single crystals.

Single-Crystal Growth and Room-Temperature Magnetocaloric Effect of X-Type Hexaferrite Sr2Co2Fe28O46.

X-type hexaferrites have been receiving considerable attention due to their promising applications in many magnetic-electronic fields. However, the growth of single-crystal X-type hexaferrite is still a challenge. Herein we reported, for the first time, the preparation of single crystal X-type hexaferrite Sr2Co2Fe28O46 (Sr2Co2X) with high-quality and large size using floating-zone method with laser as the heating source. The crystals show rhombohedral symmetry with space group of R-3m (No. 166, a = 5.8935(1) Å and c = 83.7438(17) Å). Co2+ and Fe3+ oxidation states were confirmed by the X-ray absorption near-edge spectroscopy. The prepared Sr2Co2X exhibits a spin reorientation transition from easy-cone to easy-axis at T2 of 343 K and a ferrimagnetism-paramagnetism transition at Curie temperature (TC) of ∼743 K. The spin reorientation transition was accompanied by magnetocaloric effect (MCE). Both conventional and inverse MCEs were observed near T2 with a magnetic field applied along the c-axis. The maximum value of the magnetic entropy change along the c-axis was evaluated to be 1.1 J/kg·K for a magnetic field change of 5 T.

Structural and Magnetic Properties of Ba1-xRexCo2ZnxFe16-xO27 W-type Hexaferrite prepared by Ball Milling Method

Rare earth substituted W-type hexaferrites were prepared by mixing and ball milling starting powders with molar ratios consistent with the stoichiometry of Ba1-xRexCo2ZnxFe16-xO27 (Re is a rare-earth element; x = 0.1 and 0.2), pelletizing, and sintering 1300° C. X-ray diffraction patterns showed a pure W-type phase in all samples, except in the Nd-Zn (x = 0.1) substituted sample which revealed the presence of an impurity α-Fe2O3 nonmagnetic phase. The crystallization of the W-type phase in all samples was further confirmed by the characteristic Curie temperature ranging between 476° C and 484° C as revealed by the thermomagnetic measurements. Scanning electron microscopy imaging revealed the variations of the particle size and morphology, and porosity of the prepared samples. The magnetic measurements indicated that the RE–Zn substitution improved the saturation magnetization slightly relative to the un-substituted Co2W hexaferrite, and resulted in a decrease of the coercivity and magnetocrystalline anisotropy field. In addition, the peaks below 300° C in the thermomagnetic curves is an indication of the occurrence of spin reorientation transitions in the prepared hexaferrites.

Temperature dependent terahertz giant anisotropy and cycloidal spin wave modes in BiFeO3 single crystal**Project supported by the National Natural Science Foundation of China (Grant Nos. 61975110, 11674213, 61735010, and 11604202), the 111 Project, China (Grant No. D18014), the International Joint Lab Program supported by Science and Technology Commission Shanghai Municipality, China (Grant No. 17590750300), the Key Project supported by Science

THz time-domain spectroscopy (THz-TDS) is used to study the THz-optical properties of a single crystal bismuth ferrite BiFeO3 (BFO). It can be found that the anisotropy of BiFeO3 is strongly dependent on the temperature. A giant birefringence up to around 3.6 is observed at 1 THz. The presence of a spatially modulated cycloidal antiferromagnetic structure leads to spin cycloid resonances (SCR) ψ and Φ, corresponding to the out-of-plane and in-plane modes of the spin cycloid, respectively. We distinguish the SCR with respect to their response to orthogonal polarizations of the electric fields of the incident THz beam. In addition, we observe a resonance appearing below 140 K, which might be interpreted as an electromagnon mode and related to a spin reorientation transition. Our present observations present that the temperature and polarization, as the external control parameters, can be used to modulate the THz optical properties of BFO single crystal.

Room-temperature magnetization reversal and magnetocaloric switching in Fe substituted GdMnO3

Room-temperature tunable bipolar magnetization switching and magnetically switchable magnetocaloric phenomena having numerous application potentials are reported in $\mathrm{GdM}{\mathrm{n}}_{1\ensuremath{-}x}\mathrm{F}{\mathrm{e}}_{x}{\mathrm{O}}_{3}$ ($x=0.55$ and 0.60) polycrystalline samples. Substitution of Fe in antiferromagnetic $\mathrm{GdMn}{\mathrm{O}}_{3}$ induces a first-order spin-reorientation transition $({T}_{SR})$, which along with antiferromagnetic ordering transition $({T}_{\mathrm{N}})$ gives rise to anomalies in dielectric spectra, a signature of magnetodielectric effect. Temperature-dependent Raman spectra confirm the spin-phonon coupling which could be the origin of the magnetodielectric effect in the system. Notably, low-field magnetically tunable magnetization reversal is found to appear between ${T}_{\mathrm{SR}}$ and ${T}_{\mathrm{N}}$ in these compounds owing to the competition between single-ion magnetic anisotropy and antisymmetric Dzyaloshinsky-Moriya interaction. Additionally, the $\mathrm{GdM}{\mathrm{n}}_{0.40}\mathrm{F}{\mathrm{e}}_{0.60}{\mathrm{O}}_{3}$ sample reveals the coexistence of magnetically switchable conventional and inverse magnetocaloric effect at 250 and 310 K. The tailoring of these coexisting room-temperature magnetization reversal and magnetocaloric phenomena in a single-phase system suggests a route to design the material suitable for potential applications in electromagnetic and memory devices.

Modulation of Jahn-Teller Mn3+ ion on anisotropy and high field magnetic diagram of Sm(Fe, Mn)O3

SmFeO3 and SmFe0.9Mn0.1O3 single crystal samples grown with a floating zone technique have been investigated under static and pulsed high magnetic fields along all principal crystallographic axes. Comprehensive investigation on magnetization (behavior) show that the spin switch transition and spin reorientation transition among the Sm3+ and Fe3+/Mn3+ sublattices is highly anisotropic. Especially, with the applied magnetic field along a-axis, a field induced multi-step transition was observed in SmFeO3 around compensation temperature (TComp1 ~ 3.9 K), which was not observed in Mn doped SmFe0.9Mn0.1O3 (TComp2 ~ 9.3 K). The experimental results show that the Jahn-Teller (J-T) Mn3+ ions has an important effect on anisotropy and affects the spin-reorientation and high field magnetization behavior. The study provides a clear picture to show the dominate effects between rare earth ions and transition metal ions on the complicated magnetization behavior.

Unveiling ferrimagnetic ground state, anomalous behavior of the exchange-bias field around spin reorientation, and magnetoelectric coupling in YbCr1−xFexO3 ( 0.1≤x≤0.6 )

We present a comprehensive experimental study of the magnetic structure, magnetic and dielectric properties of the rare-earth orthochromite-orthoferrite solid-solution series $\mathrm{YbC}{\mathrm{r}}_{1\ensuremath{-}x}\mathrm{F}{\mathrm{e}}_{x}{\mathrm{O}}_{3}$ ($0.1\ensuremath{\le}x\ensuremath{\le}0.6$). Room-temperature synchrotron x-ray diffraction analysis reveals the absence of any superlattice reflections, which excludes the formation of a $B$-site-ordered double-perovskite-like phase and establishes the complete solid solubility of Fe at the Cr site within the framework of orthorhombic Pbnm structure. We demonstrate that canted antiferromagnetic ground state of $\mathrm{YbCr}{\mathrm{O}}_{3}$ is converted to a ferrimagnetic with Fe doping, in addition to an increase in the magnetic ordering temperature. An unusual, second magnetic transition (first-order in nature) appears for $x\ensuremath{\ge}0.3$ samples below the ferrimagnetic transition temperature (e.g., at 70 K for $x=0.4$), which is identified as the spin reorientation of transition metal ions from the neutron powder diffraction measurements, and primarily, driven by the $f\text{\ensuremath{-}}d$ exchange interaction. A clear evidence of the anomalous behavior of coercivity and exchange bias field is found around the spin reorientation temperature, which is characterized by a significant change in the magnetocrystalline anisotropy due to spin reorientation of transition metal ions. Temperature-dependent dielectric data exhibit the magnetoelectric coupling as well as a ferroelectric relaxor-like state at the onset of ferrimagnetic ordering. Here, we reveal the anomalous behavior of the exchange bias field and significant magnetoelectric coupling around the spin reorientation and ferrimagnetic transitions, respectively, in $\mathrm{YbC}{\mathrm{r}}_{1\ensuremath{-}x}\mathrm{F}{\mathrm{e}}_{x}{\mathrm{O}}_{3}$.

Tuning magnetic properties of single-layer MnTe2 via strain engineering

We systematically study the strain-tuning effect on the electronic and magnetic properties of single-layer MnTe2 using first-principles calculations. The calculations show that the unstrained single-layer MnTe2 is an intrinsic ferromagnetic metal with a perpendicular magnetocrystalline anisotropy. The in-plane biaxial tensile strain greatly enhances the perpendicular magnetocrystalline anisotropy. The orbital-projected spin-orbit coupling energy indicates that the magnetocrystalline anisotropy energy mainly comes from the contribution of the Te atom although its magnetic moment is small. The ferromagnetic interaction between the nearest two Mn atoms is also strengthened significantly by the tensile strain. The Curie temperature increases from 88 K without strain to 440 K at 10% strain. Moreover, the single-layer MnTe2 becomes a half metal when the tensile strain is larger than 6%. If compressive strain is applied, the single-layer MnTe2 undergoes a spin reorientation transition from out-of-plane to in-plane magnetization. The compressive strain also induces the transition of the Mn–Mn exchange coupling from ferromagnetic to antiferromagnetic. The intrinsic ferromagnetic properties and the strong strain-tuning effect make the single-layer MnTe2 a promising candidate for spintronics applications.

Demagnetization of an ultrathin Co/NiO bilayer with creation of submicrometer domains controlled by temperature-induced changes of magnetic anisotropy

We have investigated the magnetization in a ferromagnetic/antiferromagnetic Co/NiO bilayer from room temperature (RT) to 200 °C. Using polar magneto-optical Kerr effect (PMOKE) based magnetometry, we observe the temperature-induced spin reorientation transition of the Co layer at 150 °C (from out-of-plane to in-plane state). Zero field cooling (ZFC) down to RT leads to the appearance of a micrometer size domain structure and demagnetization of the sample. The remanence magnetization after the ZFC process strongly depends on the temperature from which the cooling process starts (onset temperature). The domain structure and its evolution under the external out-of-plane magnetic field were studied with magnetic force and PMOKE microscopies.

Effect of Sm doping on structure, dielectric and magnetic properties of GdFeO3

Nano-particles of GdFeO3 (GFO) and Gd0.4Sm0.6FeO3 (GSFO) were synthesized by sol-gel auto-combustion method to study the effect of Sm3+doping on physical properties of GFO. Rietveld refinement of x-ray diffraction pattern confirms the proper phase formation of samples and the average octahedral <Fe–O1–Fe> angle of GSFO is found to be 145.54⁰ which is larger compared to GFO 142.53⁰. Temperature dependent DC magnetization measurements showed that Sm doping in GdFeO3introduces spin-reorientation transition which is absent in pure GdFeO3 phase. The dielectric constant of GSFO is found to be larger than that of GFO because of change in hybridization between the O-2p states and Fe-3d states. In both the ceramics at higher temperatures (above 150 °C) conduction mechanism is taking place via oxygen defect charge carrier hoping. The complex impedance analysis revealed that the distribution of relaxation time of charge carriers is temperature independent. Sm doping in GFO not only changed the dielectric properties but also changed the magnetic coercive field and shape of the magnetic isotherm of GFO.