Sign reversal of anomalous Hall conductivity and magnetoresistance in cubic noncollinear antiferromagnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>Pt</mml:mi></mml:mrow></mml:math>
 thin films

Mukherjee, Joynarayan; Suraj, T. S.; Basumatary, Himalaya; Sethupathi, K.; Raman, Karthik V.

doi:10.1103/physrevmaterials.5.014201

Cited by 15 publications

(9 citation statements)

References 39 publications

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“…Figure 1(d) shows ρ xy as a function of the external field at 300K. Negative Hall-resistance loops were observed for L1 2 -ordered Mn 3 Pt, which means the signature of AHE exists in L1 2 -ordered Mn 3 Pt and corresponds to the previous observation in the Mn 3 X (X = Sn, Ge, Ga, Ir, Pt) family of AFM materials 23,[25][26][27][28] .…”

supporting

confidence: 76%

Observation of unconventional spin polarization induced spin orbit torque in L1$_2$-ordered antiferromagnetic Mn$_3$Pt thin films

Yu,

Karube,

Liu

et al. 2021

Preprint

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Non-collinear antiferromagnets exhibits richer magneto-transport properties due to the topologically nontrivial spin structure they possess compared to conventional nonmagnetic materials, which allows us to manipulate the charge-spin conversion more freely by taking advantage of the chirality. In this work, we explore the unconventional spin orbit torque of L1 2 -ordered Mn 3 Pt with a triangular spin structure. We observed an unconventional spin orbit torque along the x-direction for the (001)-oriented L1 2 Mn 3 Pt, and found that it has a unique sign reversal behavior relative to the crystalline orientation. This generation of unconventional spin orbit torque for L1 2 -ordered Mn 3 Pt can be interpreted as stemming from the magnetic spin Hall effect. This report help clarify the correlation between the topologically nontrivial spin structure and charge-spin conversion in non-collinear antiferromagnets.

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supporting

confidence: 76%

Observation of unconventional spin polarization induced spin orbit torque in L1$_2$-ordered antiferromagnetic Mn$_3$Pt thin films

Yu,

Karube,

Liu

et al. 2021

Preprint

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“…A polarisable AHE has been observed in thin films of Mn 3 Pt [26,27], Mn 3 Ir [28], and also Mn 3 NiN [29], which is also cubic. The polarisability of thin films may be a consequence of the combination of epitaxial strain and piezomagnetism: under tetragonal lattice distortion, the spin directions become inequivalent, potentially causing spin canting and inducing a net ferromagnetic moment on which the field can act.…”

Section: Introductionmentioning

confidence: 90%

Observation of an anomalous Hall effect in single-crystal Mn₃Pt

et al. 2023

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The Mn3X family of compounds was the first in which a large anomalous Hall effect (AHE) was predicted to arise from a purely antiferromagnetic structure, due to the Berry curvature in momentum space. Nearly simultaneously with this prediction, a large AHE was observed experimentally in one of the hexagonal members of this family, Mn3Sn. Aligning antiferromagnetic domains, a necessary step for observation of the AHE, is more challenging for the cubic members of the Mn3X family, due to a combination of a smaller spontaneous ferromagnetic moment and much stronger magnetic anisotropy. Here, we use a combination of uniaxial stress and applied magnetic field to align domains of bulk single-crystal Mn3Pt, and demonstrate for the first time a substantial AHE in a cubic member of the Mn3X family. The AHE remains locked in with essentially no quantitative variation when the stress is ramped back to zero, which shows that it is not a consequence of any stress-induced ferromagnetic moment.

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“…In addition, exceptional Berry curvatures of the electron bands in topological antiferromagnets can give rise to the intrinsic anomalous Hall effect [3], as strong as that observed in conventional ferromagnetic materials [4][5][6][7]. Recently, the Kagome-type noncollinear antiferromagnetic compounds Mn 3 X, including the hexagonal compounds with X=Ge, Sn, and Ga, and the cubic compounds with X=Ir and Pt, have attracted intensive studies [8,9]. In particular, Mn 3 Ge and Mn 3 Sn were proposed to be antiferromagnetic Weyl semimetals [4,7,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, Mn 3 Ge and Mn 3 Sn were proposed to be antiferromagnetic Weyl semimetals [4,7,[10][11][12]. A variety of intriguing phenomena were observed, such as large anomalous Hall effect [5,6,9,[13][14][15][16], spin Hall effect [8,17,18], anomalous Nernst effect [19][20][21][22], and magneto-optical Kerr effect [23]. Imaging and writing magnetic domains via the anomalous Nernst effect has also been realized [24].…”

Section: Introductionmentioning

confidence: 99%

Probing magnetic anisotropy in Kagome antiferromagnetic Mn$_3$Ge with torque magnetometry

Liu¹,

Xiao²,

Yu.³

et al. 2021

Preprint

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We investigate the magnetic symmetry of the topological antiferromagnetic material Mn3Ge by using torque measurements. Below the Néel temperature, detailed angle-dependent torque measurements were performed on Mn3Ge single crystals in directions parallel and perpendicular to the Kagome basal plane. The out-of plane torque data exhibit ± sin θ and sin 2θ behaviors, of which the former results from the spontaneous ferromagnetism within the basal plane and the latter from the in-and out-of-plane susceptibility anisotropy. The reversible component of the in-plane torque exhibits sin 6ϕ behavior, revealing the six-fold symmetry of the in-plane magnetic free energy. Moreover, we find that the free energy minima are pinned to the direction of spontaneous ferromagnetism, which correspond to the maxima of the irreversible component of the in-plane torque. We provide an effective spin model to describe the in-plane magnetic anisotropy. Our results demonstrate that the ground state of Mn3Ge is described by the coexistence of a strong six-fold antichiral order and a weak ferromagnetic order induced by second-order spin anisotropy.

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Sign reversal of anomalous Hall conductivity and magnetoresistance in cubic noncollinear antiferromagnet Mn3Pt thin films

Cited by 15 publications

References 39 publications

Observation of unconventional spin polarization induced spin orbit torque in L1$_2$-ordered antiferromagnetic Mn$_3$Pt thin films

Observation of unconventional spin polarization induced spin orbit torque in L1$_2$-ordered antiferromagnetic Mn$_3$Pt thin films

Observation of an anomalous Hall effect in single-crystal Mn₃Pt

Probing magnetic anisotropy in Kagome antiferromagnetic Mn$_3$Ge with torque magnetometry

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Sign reversal of anomalous Hall conductivity and magnetoresistance in cubic noncollinear antiferromagnet Mn3Pt thin films

Cited by 15 publications

References 39 publications

Observation of unconventional spin polarization induced spin orbit torque in L1$_2$-ordered antiferromagnetic Mn$_3$Pt thin films

Observation of unconventional spin polarization induced spin orbit torque in L1$_2$-ordered antiferromagnetic Mn$_3$Pt thin films

Observation of an anomalous Hall effect in single-crystal Mn3Pt

Probing magnetic anisotropy in Kagome antiferromagnetic Mn$_3$Ge with torque magnetometry

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Observation of an anomalous Hall effect in single-crystal Mn₃Pt