Butterfly-shaped Hysteresis Research Articles

Orbital multiferroicity in pentalayer rhombohedral graphene.

Ferroic orders describe spontaneous polarization of spin, charge and lattice degrees of freedom in materials. Materials exhibiting multiple ferroic orders, known as multiferroics, have important parts in multifunctional electrical and magnetic device applications1-4. Two-dimensional materials with honeycomb lattices offer opportunities to engineer unconventional multiferroicity, in which the ferroic orders are driven purely by the orbital degrees of freedom and not by electron spin. These include ferro-valleytricity corresponding to the electron valley5 and ferro-orbital-magnetism6 supported by quantum geometric effects. These orbital multiferroics could offer strong valley-magnetic couplings and large responses to external fields-enabling device applications such as multiple-state memory elements and electric control of the valley and magnetic states. Here we report orbital multiferroicity in pentalayer rhombohedral graphene using low-temperature magneto-transport measurements. We observed anomalous Hall signals Rxy with an exceptionally large Hall angle (tanΘH > 0.6) and orbital magnetic hysteresis at hole doping. There are four such states with different valley polarizations and orbital magnetizations, forming a valley-magnetic quartet. By sweeping the gate electric field E, we observed a butterfly-shaped hysteresis of Rxy connecting the quartet. This hysteresis indicates a ferro-valleytronic order that couples to the composite fieldE·B(where Bis the magnetic field), but not to the individual fields. Tuning E would switch each ferroic order independently and achieve non-volatile switching of them together. Our observations demonstrate a previously unknown type of multiferroics and point to electrically tunable ultralow-power valleytronic and magnetic devices.

ZnII-DyIII single-molecule magnets constructed by salen-type ligand, acetate and β-diketonate

A series of ZnII-DyIII complexes with molecular formula [LZn(CH3COO)Dy(hfac)2] (1), [LZn(CH3COO)2Dy(dbm)]·CH2Cl2 (2), [LZn(CH3COO)Dy(btfa)2]·CH2Cl2 (3), (H2L = N,N'-bis(3-methoxysalicylidene)-1,2-phenylenediamine, hfac = hexafluoroacetylacetone, dbm = dibenzoylmethane, btfa = benzoyltrifluoride acetone) were structurally and magnetically characterized. They have similar ZnII-DyIII structural cores bridged by N and O atoms of the hexadentate salen type ligand (L). The main difference between them is the peripheral β-diketonate co-ligands surrounding DyIII ion. Dynamic magnetic properties measurements revealed that complexes 1-3 exhibit the field-induced SMM behavior with relaxation energy barriers Ueff/kB of 45.49 K, 69.28 K and 101.34 K, respectively. The ac magnetic susceptibility of diluted sample 3Dy0.05Y0.95 confirmed the single molecule original relaxation, in which the quantum tunneling of magnetization (QTM) was suppressed efficiently and a butterfly-shaped hysteresis loop at 1.8 K was observed.

Magnetic and magneto-transport studies in van der Waals Fe5−xGeTe2 flakes

The layered van der Waals metallic material Fe5−xGeTe2, which has near room-temperature itinerant ferromagnetism, offers unprecedented opportunities to explore exotic phenomena and functionalities as well as prospective uses in spintronic or quantum devices. However, the intriguing magnetic ground state of Fe5−xGeTe2 is quite complicated and remains controversial. In this work, we investigate the magnetic ordering transitions in Fe5−xGeTe2 nanoflakes through magneto-transport measurements. The anomalous Hall resistance increases with rising temperature, reaching its maximum at 100 K. Meanwhile, a clear butterfly-shaped magnetoresistance hysteresis was observed with opposite dependence on the switching field around this critical temperature. All experimental results point to the scenario that Fe5−xGeTe2 transitions from the paramagnetic to ferromagnetic state at 265 K and then evolves to a ferrimagnetic state at 100 K. Our work promotes the understanding of magnetism in Fe5−xGeTe2 and motivates further efforts to develop room-temperature spintronic devices based on Fe5−xGeTe2.

Ferroelectric polarization-enhanced photodegradation performance for dyes in BaTiO3/AgAlO2 heterostructure

Introducing an internal electric field into photocatalysts is an efficient strategy to inhibiting the charge carrier recombination which is the obstacle to the photocatalytic technology. Herein, we propose to construct BaTiO3/AgAlO2 heterostructure with improved photocatalytic performance through a polarization effect. The ferroelectric BaTiO3 particles with nanocube morphology are distributed over ellipsoid-like AgAlO2. The UV–vis absorption edges extend from 415 to 545 nm owing to the energy band overlap. The ultrasound-assisted photocatalysis efficiency of methyl blue under BaTiO3/AgAlO2 is increased by 22 %. Photoelectrochemical results indicate that the separation efficiency of photoinduced carriers is enhanced by the polarization effect. Moreover, the photocurrent of the BaTiO3/AgAlO2 after polarization is increased by 1.6 times of that before polarization. Piezoelectric force microscope shows that the phase angle has a great change, confirming the polarization switching process. The butterfly-shaped displacement-voltage hysteresis loop confirms the local piezoelectric response originated from BaTiO3.

Fully solution-processed organic RRAM device with highly stable butterfly-shaped hysteresis

Resistive random access memory (RRAM) is considered a promising next-generation memory device owing to its low energy consumption and ultra-high speed. In this study, we demonstrated a vacuum-free and low-cost solution to fabricate a highly stable nonvolatile RRAM device. Organic materials such P3HT and PEDOT:PSS were used to form the active layer and top electrode, respectively. The fabricated organic RRAM has a structure of ITO/P3HT/PEDOT:PSS, and exhibits well-controlled and highly stabilized nonvolatile butterfly shape resistive switching behavior, with an endurance of up to 1000 repeated cycling tests. Schottky emission, hopping, and direct tunneling were evaluated for switching mechanism. The geometrical structure was analyzed using the field emission scanning electron microscopy image, and the switching mechanisms were confirmed through the ultraviolet photoelectron spectroscopy measurement and energy band diagram analysis. Our results indicate that the fabricated solution-processed organic RRAM devices have the potential for use in nonvolatile memory devices.

Antiferromagnetic structure and magnetic properties of Dy2O2Te : An isostructural analog of the rare-earth superconductors R2O2Bi

The rare-earth compounds R2O2Bi (R=Tb, Dy, Er, Lu, Y) are newly discovered superconductors in the vicinity of a rare-earth magnetic long-range order. In this work, we determine the magnetic order of the parent compound Dy2O2Te by neutron scattering as the A-type antiferromagnetic structure below the N\'eel temperature TN=9.7K. The large staggered magnetic moment 9.4(1) {\mu}B per Dy at T=3.5K lies in the basal ab plane. In a magnetic field, anomalous magnetic properties including the bifurcation between zero-field- and field-cooling magnetization, a butterfly-shaped magnetic hysteresis, and slow magnetic relaxation emerge, which are related to the field-induced metamagnetic transitions in Dy2O2Te. Our experimental findings could stimulate further research on the relation between antiferromagnetism and superconductivity in these rare-earth compounds.

Opening magnetic hysteresis via improving the planarity of equatorial coordination by hydrogen bonding.

Through a mixed-ligand strategy, the structural change from a discrete dinuclear DyIII cluster to a one-dimensional polymeric chain was achieved, maintaining the two magnetic entities with the same {Dy(dppbO2)2(H2O)5} (dppbO2 = 1,4-butylenebis(diphenylphosphine oxide)) core structure. Since the hydrogen bonding between the equatorial coordinated water molecules and the guests/solvents/anions is distinct, the local geometry and the equatorial planarity of the first coordination sphere of the central DyIII ion become slightly different caused by the second coordination sphere. As a result, the dinuclear compound shows typical butterfly-shaped hysteresis loops, while it significantly opens at zero magnetic field up to 11 K for the 1D polymer, which is unprecedented in coordination polymers. Our experimental observations and theoretical analysis indicate that the hydrogen bonding leads to the fine-tuning of certain bond lengths and angles of the coordination environment, as well as the crystal field to a certain extent, revealing that the second coordination sphere affects the first coordination sphere by hydrogen bonding.

Modeling of butterfly-shaped hysteresis in dielectric elastomer actuators

Dielectric elastomer actuators exhibit butterfly-shaped hysteresis effects under unbiased periodic input signals. In comparison with single hysteresis effects, butterfly-shaped hysteresis effects are more complicated, which include two single hysteresis loops, and the directions of both loops are different. Hence, it is a great challenge to build a hysteresis model to describe the butterfly-shaped behavior. To this end, a butterfly-shaped relay operator is newly proposed as an elementary operator to construct the butterfly-shaped Preisach model, and the weighting functions/weights of the developed model are positively defined, which facilitates the construction of the unique inverse model and the controller design. To further improve the modeling accuracy, a piecewise-defined butterfly-shaped Preisach model considering the variation of asymmetric nonlinear hysteresis effects with different input amplitudes is proposed. Experiments with the fabricated elastomer actuator-actuated system are conducted to validate the effectiveness of the developed modeling approach.

Polymer conformation-dependent piezoelectric properties and self-bias magnetoelectric responses in adhesive-free laminate composites of Ni-foam/PVDF/Ni-foam

In the past decade, polymer-based magnetoelectric (ME) laminate composites have been developed for feasible applications such as flexible energy harvesters and wearable sensors. The 2-2-type ME laminate composites have been typically prepared by epoxy adhesion of piezoelectric and magnetostrictive layers, which is a drawback that disrupts strain transfer from the magnetostrictive phase to the piezoelectric phase due to its strong hardness after epoxy curing. In this study, to overcome the disadvantage of insufficient strain transfer due to the adhesive layers, we designed adhesive-free laminate composites consisting of porous magnetostrictive nickel foam (NF) and soft poly (vinylidene fluoride) (PVDF) films, which exhibited good physical coupling via the sandwich hot-pressing of NF/PVDF/NF. In addition, the self-bias ME effect could be expected from NF, since it exhibits butterfly-shaped magnetostrictive hysteresis loops. Therefore, NF/annealed PVDF(AP)/NF and NF/hot-pressed PVDF(HP)/NF were prepared for investigating the polymer conformation during the fabrication process of ME laminates. Polymer conformation-dependent piezoelectric properties were investigated after annealing and hot-pressing, respectively. The NF/AP/NF laminates (mM/mP = 0.88) were found to exhibit a β/α phase ratio of 2.07, degree of crystallinity (χc) of 46.5%, piezoelectric charge constant (d33) of 17.7 pC/N, and self-bias ME response of 1.88 mV/cm Oe (94% of the maximal ME response at Hbias = 20 Oe). The NF/HP/NF laminates (mM/mP = 1.26) were found to exhibit a β/α phase ratio of 1.40, χc of 32.2%, d33 of 12.4 pC/N, and self-bias ME response of 2.27 mV/cm Oe (92% of the maximal ME response at Hbias = 10 Oe). The high β/α phase ratio were carried out sufficient stretching effect during hot-press laminating process. The optimal piezoelectric properties of β/α phase ratio and χc were induced by predominant stretching of PVDF chains rather than recrystallization during the hot-press. Further, reliable self-bias ME responses were obtained in the adhesive-free laminate composites by enhancement of coupling effect between magnetostrictive and piezoelectric phases. As a result, the sandwich laminate composites of NF/PVDF/NF were successfully prepared via hot-pressing and reliable ME responses were obtained without requiring the electroding process. This demonstrates the feasibility of ME laminate composites for use in wearable energy harvesters or sensors through removal of the hard adhesive layer.

Butterfly-shaped magnetoresistance in van der Waals ferromagnet Fe5GeTe2

We have performed magnetoresistance (MR) measurements on van der Waals ferromagnetic devices using quenched- (Q-) and nonquenched- (NQ-) Fe5GeTe2 crystals. A clear butterfly-shaped hysteresis has been observed for thin-film (less than 6 unit-cell layer) Q- and NQ-Fe5GeTe2 devices, but not for thicker film ones. The switching field of the butterfly-shaped MR is consistent with the coercive filed obtained from the Hall measurements. The MR ratio of the butterfly peak reaches about 10% at maximum, which is much larger than that observed with conventional magnetic materials. Such a large MR ratio would be related to magnetic fluctuations due to the complicated magnetic structure in this material.

Hexanuclear [Cp*Dy]6 single-molecule magnet.

A hexanuclear cluster [(Cp*Dy)6K4Cl16(THF)6], [Cp*Dy]6, has been constructed from six {Cp*DyIII} synthons in which the strongly coordinating Cp*- caps determine the local anisotropy axes. Structural characterization of [Cp*Dy]6 shows two almost parallel triangular (Cp*Dy)3 fragments that are linked by the K+ and Cl- ions. Magnetic measurements reveal slow thermal relaxation and fast quantum tunneling relaxation in the absence of an external dc field. After applying a weak dc field, the quantum tunneling relaxation is efficiently suppressed, giving a sizable energy barrier of 561 K, which represents the current record energy barrier for high nuclearity organometallic SMMs.

Regulation of Substituent Effects on Configurations and Magnetic Performances of Mononuclear DyIII Single-Molecule Magnets.

A series of mononuclear DyIII compounds, [Dy(tmpd)3(4,4'-dmpy)] (1), [Dy(tffb)3(4,4'-dmpy)] (2), [Dy(tffb)3(5,5'-dmpy)] (3), and [Dy(tmpd)3(5,5'-dmpy)] (4) [tmpd = 4,4,4-trifluoro-1-(4-methoxyphenyl)-1,3-butanedione, tffb = 4,4,4-trifluoro-1-(4-fluorophenyl)-1,3-butanedione, 4,4'-dmpy = 4,4'-dimethyl-2,2'-bipyridyl, and 5,5'-dmpy = 5,5'-dimethyl-2,2'-bipyridyl], have been synthesized by modifying β-diketonate ligands and capping N-donor co-ligands. DyIII ions in 1-4 possess N2O6 octacoordinated environments. Compounds 1 and 2 exhibit distorted trigonal dodecahedron configurations, while 3 and 4 display distorted square antiprismatic configurations. Systematic investigations of the alternating current measurements indicate the different magnetic relaxation dynamics with energy barriers (Ueff) of 66 K (1, 45 cm-1), 189 K, (2, 131 cm-1), 115 K (3, 79 cm-1), and 205 K (4, 142 cm-1). To deeply understand their different magnetic behaviors, the magnetic anisotropies of 1-4 were studied by ab initio calculations. From ab initio calculations, the energies of the first excited state (KD1) are consistent with the experimental Ueff under zero direct current field. Compound 4 presents the largest Ueff because of the smallest gX,Y and μQTM as well as the most strong axial crystal field parameters (CFPs) among compounds 1-4. The M versus H data exhibit butterfly-shaped hysteresis loops at 2 K for 1-4. The different coordination geometries, the magnetic dynamics, the electrostatic repulsion, and CFPs result from the different substituent effects of ligands, including the electronic effect, the steric effect, and the positions of substituted groups.

Different single-molecule magnets behaviors of carboxyl bridged dinuclear Dy(III) complexes induced by charged and neutral ligand

Three dinuclear dysprosium complexes, namely, Dy2(DBM)4L2(CH3CH2OH)2·2CH2Cl2(1), Dy2(DBM)4L2(CH3OH)2·2CH2Cl2(2), Dy2(BAC)4L2(CH3CH2OH)2 (3) and yttrium compound Y2(BAC)4L2(CH3CH2OH)2 (3Y) (L = 2,6-dimethoxybenzoic acid, DBM = dibenzoyl methane, BAC = Benzoylacetone), were structurally and magnetically characterized. The single-crystal structures showed that L serves as an effective bridge to link two Dy(III) centers with μ2-η1:η2-O2 coordination mode. Each Dy(III) ion was chelated by two bidentate β-diketonate co-ligands and a methanol or ethanol molecule, leading to an eight-coordinated geometry. The magnetic measurements revealed that all the complexes behaved as field-induced single-molecule magnets, and the ferromagnetic intramolecular interactions between Dy(III) ions are apparent. Strikingly, the alteration of neutral ligands between 1 and 2 did not result in a significant change of their relaxation energy barriers (Ueff/kB = 25.6 K and 26.1 K respectively), while the dramatically enhancement of energy barrier by nearly triple (91.6 K) increase was observed in 3 when modulating the terminal of β-diketonate anion and the open butterfly-shaped hysteresis loop was also observed at 1.8 K in 10% diluted samples of 3. The electrostatic model for the determination of the magnetic anisotropy in Dy complexes implemented by the Magellan program revealed that the dynamic magnetic relaxation is dominated by the charged β-diketonate ligand much more than the neutral ligand in this case.

Effect of nuclearity and symmetry on the single-molecule magnets behavior of seven-coordinated β-diketonate Dy(III) complexes

A couple of mononuclear and dinuclear lanthanide complexes, Dy(thd)3(Py) (1), Ln2(thd)6(4,4′-Bpy) (Ln = Dy (2), Gd (3), Py = Pyridine, 4,4′-Bpy = 4,4′-Bipyridine) have been designed and isolated from the reaction of β-diketonate-based ligand 2,2,6,6-tetramethyl-3,5-heptanedione (Hthd), LnCl3∙6H2O and neutral ligands. The single-crystal X-ray diffraction analysis confirms that the Dy(III) ions of complexes 1 and 2 are seven-coordinated with N1O6 coordination environment, forming C3v and C2v local symmetry. Magnetic studies reveal that mononuclear complex 1 displays butterfly-shaped hysteresis loops at 1.8 K and slow relaxation of magnetization with energy barrier 34.7 K in optimized external filed while dinuclear complex 2 not exhibits single-molecule magnet (SMM) behavior. The variable temperature magnetic data of dinuclear Gd(III) analogues (3) indicate the negligible intramolecular magnetic interactions between the two Gd(III) centers in structure due to long Ln⋅⋅⋅ Ln distance. The diluted sample by Y(III) ions of complexes 1′ and 2′ and electrostatic model calculation were employed to elucidate distinction of magnetic properties. Investigation of magneto-structural correlation emphasizes that the orientation of the magnetic axis affects the magnetic properties, which is further associated with local symmetry of the Dy(III) ions.

Nanostructure‐enhanced magnetoelectric/magnetostrictive properties and reduced losses in self‐assembled epitaxial CuFe2O4–BiFeO3 layers on Pb(Mg1/3Nb2/3)O3–33at%PbTiO3 crystals

AbstractSelf‐assembled two‐phase heterostructures of BiFeO3 and CuFe2O4 (BFO–CuFO) were deposited on (100)‐oriented SrRuO3‐buffered Pb(Mg1/3Nb2/3) O3–33at%PbTiO3 (PMN–PT) by using switching pulsed laser deposition (SPLD), and compared to single layers of CuFO on the same single crystal substrate. The CuFO phase of the self‐assembled layers had notably slimmer M‐H loops than for previously reported vertically integrated CoFe2O4 nanopillar ones, but wider ones than for CuFO/PMN–PT heterostructures. Notable changes in the magnetization of the CuFO nanopillars were found with applied DC electric field (EDC), where Mr/Ms exhibited typical butterfly‐shaped hysteresis with EDC. This was in distinct difference to CuFO/PMN–PT heterostructures which did not exhibit magnetoelectric coupling. The findings demonstrate a trade‐off between magnetoelectric/magnetostrictive properties and loss that can be controlled by nanostructure features.

Single-Molecule Magnet Behavior of 1D Coordination Polymers Based on DyZn2(salen)2 Units and Pyridin- N-Oxide-4-Carboxylate: Structural Divergence and Magnetic Regulation.

Two 1D coordination polymers composed of DyZn2(salen)2 units and pyridin- N-oxide-4-carboxylate have been prepared by solvothermal reactions. Complex 1 with the formula {[DyZn2(La)2(POC)](OH)(ClO4)}·H2O·MeOH [H2La] = N, N'-bis(3-methoxysalicylidene)-1,3-diaminopropane, POC- = pyridin- N-oxide-4-carboxylate] is composed of a zigzag chain cation [DyZn2(La)2(POC)] n2 n+ as well as isolated hydroxide and perchlorate anions. Complex 2 with the formula {[Dy3Zn7(Lb)6(POC)6](OH)3(ClO4)2}·9H2O [H2Lb] = N, N'-bis(3-methoxysalicylidene)-1,2-diaminoethane] is also an ionic compound containing isolated hydroxide and perchlorate anions, but its cation shows a novel nanowire structure, in which six-coordinate zinc(II) ions with C3 symmetry act as the axis and [DyZn2(Lb)2(POC)]2+ structural units as spiral leaves. Complex 1 shows good single-molecule magnet performance with an Ueff/ k value of 235.3(3.1) K ( Hdc = 0 Oe), one of the largest values for coordination polymers. A butterfly-shaped magnetic hysteresis loop can be monitored at as high as 3.8 K for 1, while a dc field is necessary for complex 2 to display slow magnet relaxation owing to the quantum-tunneling effect, with a much smaller Ueff/ k value of 14.6(0.2) K ( Hdc = 1000 Oe). The difference of magnetic properties has been explained using detailed ab initio calculations.

Manipulating the Relaxation of Quasi- D4 d Dysprosium Compounds through Alternation of the O-Donor Ligands.

Three mononuclear DyIII complexes with the same auxiliary ligand Lz (2,4-diamino-6-pyridyl-1,3,5-triazine), [Dy(TTA)3Lz] (1Dy) (TTA = 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedionate), [Dy(acac)3Lz]·CH3OH·0.5H2O (2Dy) (acac = acetylacetonate), and [Dy(MQ)2Lz2]Br·CH3OH (3Dy) (HMQ = 2-methyl-8-quinolinol), have been synthesized through alteration of the ligands containing O donors. In all three complexes, the DyIII ions are eight-coordinate and submitted to pseudo- D4 d symmetry in the first coordination sphere. It is noteworthy that the TTA ligands in 1Dy are easily substituted by other bidentate capping ligands with O donors, leading to distinct magnetic properties, which were studied experimentally and via ab initio calculations. All three complexes were found to exhibit single-molecule magnet behavior with Ueff of 22 cm-1 (1Dy), 112 cm-1 (2Dy), and 56 cm-1 (3Dy) under zero applied dc field. Complex 1Dy demonstrates inferior SIM properties compared with 2Dy and 3Dy, which can be attributed to the strong electron-withdrawing effects of TTA ligands, as confirmed by theoretical calculations. However, butterfly-shaped magnetic hysteresis in 1Dy and 3Dy was observed at 1.9 K, while not in 2Dy.

Fundamental circuit element and nonvolatile memory based on magnetoelectric effect

The magnetoelectric coupling effect in materials provides an additional degree of freedom of physical states for information storage and shows great potential in developing a new generation of memory devices. We use an alternative concept of nonvolatile memory based on a type of nonlinear magnetoelectric effects showing a butterfly-shaped hysteresis loop. The state of magnetoelectric coefficient, instead of magnetization, electric polarization, or resistance, is utilized to store information. Because this memory concept depends on the relationship between the charge and magnetic flux, it is actually the fourth fundamental circuit memory element in addition to memristor, memcapacitor, and meminductor, and is defined as memtranstor. Our experiments in memtranstor comprised of the[Pb(Mg1/3Nb2/3)]0.7[PbTiO3]0.3(PMN-PT)/Terfenol-D and Ni/PMN-PT/Ni multiferroic heterostructures clearly demonstrated that the magnetoelectric coefficient can be repeatedly switched not only between positive and negative polarities but also between multilevel states by applying electric fields, confirming the feasibility of this principle. In addition to nonvolatile memory, the nonvolatile logic functions, such as NOR and NAND and synaptic plasticity functions, such as long-term potentiation/depression and spiking-time-dependent plasticity are implemented in a single memtranstor by engineering the applied electric-field pulses. The combined functionalities of memory, logic, and synaptic plasticity enable the memtranstor to serve as a promising candidate for future computing systems beyond von Neumann architecture.

Magnetoconductance signatures of chiral domain-wall bound states in magnetic topological insulators

Recent magnetoconductance measurements performed on magnetic topological insulator candidates have revealed butterfly-shaped hysteresis. This hysteresis has been attributed to the formation of gapless chiral domain-wall bound states during a magnetic field sweep. We treat this phenomenon theoretically, providing a link between microscopic magnetization dynamics and butterfly hysteresis in magnetoconductance. Further, we illustrate how a spatially resolved conductance measurement can probe the most striking feature of the domain-wall bound states: their chirality. This work establishes a regime where a definitive link between butterfly hysteresis in longitudinal magneto-conductance and domain-wall bound states can be made. This analysis provides an important tool for the identification of magnetic topological insulators.

Organophosphonate-Bridged Polyoxometalate-Based Dysprosium(III) Single-Molecule Magnet.

A novel dysprosium(III)-containing polytungstoarsenate, [{(AsW9O33)3Dy2(H2O)4W4O9(H2O)}2(NH2(CH2PO3)2)]33-, comprising two identical subunits bridged by an organophosphonate ligand shows single-molecule-magnet (SMM) behavior. Magnetic studies reveal that this complex exhibits a butterfly-shaped hysteresis loop up to 8 K, and a thermally activated energy barrier of 101(5) K reached a breakthrough among all polyoxometalate-supported SMMs.