Spin reorientation in MnBi

Yoshida, Hajime; Shima, T.; Takahashi, Takahiro; Fujimori, H.; Abe, S.; Kaneko, T.; Kanomata, T.; Suzuki, Takanori

doi:10.1016/s0925-8388(00)01352-9

Cited by 26 publications

(22 citation statements)

References 11 publications

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“…This result is consistent with a previous report [7]. Yoshida et al [13] observed thermal hysteresis in the temperature variation of the AC permeability of MnBi in the vicinity of T SR and suggested that the spin reorientation transition is of the first order. Figure 3(a) shows the powder x-ray diffraction patterns of LTP-MnBi at 292 K for B = 0 and 4 T. For B = 4 T, the 300 and 220 peaks are enhanced, though the hkl peaks are suppressed except for the 211 and 311 peaks.…”

Section: Methodssupporting

confidence: 94%

“…According to the report on the effect of pressure on LTP-MnBi by Yoshida et al [13], T SR increases linearly with quasi-hydrostatic pressure P at the rate of dT SR /dP = 0.96 K GPa −1 . They suggested that the cell volume in the state with the magnetic easy direction along the c-axis is larger than that when the axis is in the c-plane.…”

Section: Magnetic and Structural Properties At Low Temperaturementioning

confidence: 98%

“…This spin reorientation was also observed by neutron diffraction [10,11] and nuclear magnetic resonance (NMR) [12] measurements on LTP-MnBi. However, the relation between the magnetic and structural properties has not yet been clarified in detail [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and structural phase transitions of MnBi under high magnetic fields

Koyama

Mitsui

Watanabe

2008

Science and Technology of Advanced Materials

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High-field x-ray diffraction and magnetization measurements and differential thermal analysis (DTA) were carried out for polycrystalline MnBi with an NiAs-type hexagonal structure to investigate its magnetic and structural phase transitions. The lattice parameter a rapidly decreases below the spin reorientation temperature T SR (= 90 K) in a zero magnetic field. The parameter c decreases gradually with decreasing temperature and exhibits an anomaly in the vicinity of T SR . By applying a magnetic field of 5 T, the parameter a increases by ∼0.05% when T < T SR and varies smoothly when 8 T 300 K. DTA data show that the magnetic phase transition temperature from the ferromagnetic state to the paramagnetic state increases linearly at a rate of 2 KT −1 with increasing magnetic field up to 14 T.

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Section: Methodssupporting

confidence: 94%

Section: Magnetic and Structural Properties At Low Temperaturementioning

confidence: 98%

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Magnetic and structural phase transitions of MnBi under high magnetic fields

Koyama

Mitsui

Watanabe

2008

Science and Technology of Advanced Materials

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“…The lattice parameters a and c were determined to be 0.4310 nm and 0.6076 nm at RT, respectively, which are comparable to the reported data of the LTP phase. 4,5,[7][8][9][10][11][12] Using a Farady-force magnetometer, magnetization M was measured in the temperature range from 300 to 620 K and in magnetic fields up to 10 T. The experimental setup of the magnetization measurements was described in Ref. 13) in detail.…”

Section: Methodsmentioning

confidence: 99%

Magnetic Phase Transition of MnBi under High Magnetic Fields and High Temperature

et al. 2007

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Magnetization measurements and differential thermal analysis (DTA) of polycrystalline MnBi were carried out in magnetic fields up to 14 T and in 300-773 K, in order to investigate the magnetic phase transition. The magnetic phase transition temperature (T t ) at a zero magnetic field is 628 K and linearly increases with increasing fields up to 14 T at the rate of 2 KT À1 . A metamagnetic transition between the paramagnetic and field-induced ferromagnetic states was observed just above T t . The exothermic and endothermic peaks were detected in the magnetic field dependence of DTA signals in 626-623 K, which relates to the metamagnetic transition. The obtained results were discussed on the basis of a mean field theory.

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“…12 Theoretical and experimental studies have shown that the ratio between in-plane and out-of-plane lattice parameters plays an important role in determining the magnetic anisotropy and magnetization. 11,13,14 In Mn-pnictide ferromagnets, MnAs, MnSb, and MnBi, with hexagonal NiAs-type structures, structural response to temperature or pressure is characterized by anisotropic lattice change.…”

mentioning

confidence: 99%

Element-resolved magnetism across the temperature- and pressure-induced spin reorientation in MnBi

Choi

Jiang

et al. 2016

Phys. Rev. B

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Rare-earth free permanent magnet MnBi (NiAs-type crystal structure) displays strong uniaxial magnetic anisotropy above its ∼90 K spin reorientation transition (SRT). X-ray magnetic circular dichroism (XMCD) measurements at the Mn K and Bi L2,3 edges show induced magnetism in Bi, which is strongly coupled to the magnetism of Mn. Temperature-and pressure-dependent XMCD results reveal that hydrostatic pressure mimics the effect of temperature, driving a transition from uniaxial to in-plane anisotropy. The pressure and temperature transitions are shown to be connected to an anisotropic lattice contraction in NiAs-type structures. Temperature and pressure, hence, induce coupled structural and magnetic responses, highlighting the importance of both anisotropic lattice change and Mn-Bi hybridization in leading to the magnetic anisotropy change across the SRT. The dependence of magnetic anisotropy on the anisotropic lattice change is confirmed by density functional theory.

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Spin reorientation in MnBi

Cited by 26 publications

References 11 publications

Magnetic and structural phase transitions of MnBi under high magnetic fields

Magnetic and structural phase transitions of MnBi under high magnetic fields

Magnetic Phase Transition of MnBi under High Magnetic Fields and High Temperature

Element-resolved magnetism across the temperature- and pressure-induced spin reorientation in MnBi

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