The chiral Hall effect in canted ferromagnets and antiferromagnets

Jonathan, Kipp,; Samanta, Kartik; Lux, Fabian R.; Merte, M.; Go, Dongwook; Hanke, Jan-Philipp; Redies, Matthias; Freimuth, Frank; Blügel, Stefan; Mokrousov, Yuriy

doi:10.1038/s42005-021-00587-3

Cited by 25 publications

(16 citation statements)

References 51 publications

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“…This behavior can be explained by the robustness of intrinsic contributions to the CHE. In fact, with decreasing disorder the values of the CHE converge to the clean limit values, which are given by the integrated values of Berry curvature Ω xy antisymmetrized with respect to q [20]. The rise of non-vanishing intrinsic chiral AHE becomes apparent from looking at Fig.…”

Section: Chiral Hall Effectmentioning

confidence: 88%

“…The corresponding chiral Hall effect (CHE) was shown to be directly sensitive to the sense of local spin chirality and, in contrast to the topological Hall effect, to fine details of spin distribution [18,19], which potentially makes it a powerful tool for tracking texture dynamics with magnetotransport means. Recently, it was also demonstrated from model considerations and first-principles calculations that the CHE can be prominent in canted spinorbit coupled ferromagnets and antiferromagnets [20]. For textures, a signal consistent with such chiral contributions has been reported experimentally for the anomalous Hall effect (AHE) [21], the planar Hall effect (PHE) [9], and magnetoconductivity (MC), although additional analysis is necessary to unambiguously pin down the exact microscopic origin of the observed signal.…”

Section: Introductionmentioning

confidence: 99%

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Chiral response of spin spiral-states as the origin of chiral transport fingerprints of spin textures

Jonathan¹,

Lux²,

Mokrousov³

2021

Preprint

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The transport properties of non-trivial spin textures are coming under closer scrutiny as the amount of experimental data and theoretical simulations is increasing. To extend the commonly accepted yet simplifying and approximate picture of transport effects taking place in systems with spatially varying magnetization, it is important to understand the transport properties of building blocks for spin textures − the homochiral spin-spiral states. In this work, by referring to phenomenological symmetry arguments based on the gradient expansion, and explicit calculations within the Kubo framework, we study the transport properties of various types of spin-spirals in a two-dimensional model with strong spin-orbit interaction. In particular, we focus on the contributions to the magnetoconductivity, the planar Hall effect and the anomalous Hall effect, which are sensitive to the sense of chirality of the spiral states. We analyze the emergence, symmetry, and microscopic properties of the resulting chiral magnetoconductivity, chiral planar Hall effect, and chiral Hall effect in terms of spin-spiral propagation direction, cone angle, spiral pitch, and disorder strength. Our findings suggest that the presence of spin-spiral states in magnets can be readily detected in various types of magnetotransport setups. Moreover, the sizable magnitude of chiral contributions to the conductivity of skyrmions estimated from homochiral spirals implies that chiral, as opposed to topological, magnetotransport can play a prominent role for the detection of non-trivial spin textures.

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Section: Chiral Hall Effectmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Chiral response of spin spiral-states as the origin of chiral transport fingerprints of spin textures

Jonathan¹,

Lux²,

Mokrousov³

2021

Preprint

Self Cite

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“…We foresee that Heusler and half-Heusler compounds, with noncollinear magnetic groundstates, [28,43,[45][46][47][48][49][50] should exhibit rich transport properties endowed by their Berry curvature, whose various manifestations remain partially unexplored and origin(s) in part unexplained. Beyond the celebrated electrodynamics of magnetic skyrmion quasi-particles, [51] Heusler compounds offer a rich platform for the exploration of their prospective use in functional spintronics devices with PMA (e.g., for SO-torque-induced switching of magnetic random access memory devices [52,53] ), with the additional motivation of establishing new transport signatures [54,55] and overall new understandings of noncollinear magnetic structures.…”

Section: Discussionmentioning

confidence: 99%

Anomalous Hall Effect in Epitaxial Thin Films of the Hexagonal Heusler MnPtGa Noncollinear Hard Magnet

Ibarra

Lesne

Sabir

et al. 2022

Adv Materials Inter

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Materials hosting noncollinear magnetic ordering and sizeable spin‐orbit coupling can manifest perpendicular magnetic anisotropy and a Berry curvature‐driven intrinsic anomalous Hall effect. In this work, the structural, magnetic, and magnetotransport properties of crystalline hexagonal Heusler MnPtGa epitaxial thin films are reported. The centrosymmetric MnPtGa films (P63/mmc space group) crystallize with a preferred c‐axis (0001) crystal orientation. Along this crystallographic direction, the MnPtGa films exhibit preferential perpendicular magnetic anisotropy, below the Curie temperature TC = 263 K, with a large effective uniaxial magnetic anisotropy Keff = 0.735 MJ m−3, at 150 K. In addition, the MnPtGa system undergoes a thermally induced spin reorientation transition below Tsr = 160 K, which marks the onset of a noncollinear spin‐canted state. The anomalous Hall conductivity (AHC) of MnPtGa films exhibits a nonmonotonic behavior as a function of temperature, which changes sign at T* = 110 K. Concurrently with the reported unusual dependence of the AHC on the longitudinal conductivity in MnPtGa crystalline thin films, these findings strongly suggest an anomalous Hall effect of intrinsic origin, driven by a momentum‐space Berry curvature mechanism, as supported by first‐principle calculations.

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“…Recently, the interplay between electronic transport and the Néel order of metallic antiferromagnets has attracted a surge of interest, partly stimulated by the realization of electric control of sublattice magnetization utilizing strong spin-orbit coupling (SOC) and space inversion symmetry breaking in collinear antiferromagnetic metals [4][5][6][7][8][9]. A moderate change in the spin orientation of a collinear antiferromagnet (such as spin canting) may have a significant effect on the electronic band structure and subsequently manifest itself in transport properties [10][11][12][13][14]. There have also been reviving efforts to develop new optical [15,16] or electrical [17][18][19] probes to read out antiferromagnetic order.…”

Section: Introductionmentioning

confidence: 99%

Unidirectional Magnetoresistance in Antiferromagnet/Heavy-metal bilayers

Shim,

Mehraeen,

Sklenar

et al. 2022

Preprint

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The interplay between electronic transport and antiferromagnetic order has attracted a surge of interest as recent studies have shown that a moderate change in the spin orientation of a collinear antiferromagnet may have a significant effect on the electronic band structure. Among numerous electrical probes to read out such magnetic order, unidirectional magnetoresistance (UMR), where the resistance changes under the reversal of the current direction, can provide rich insights into the transport properties of spin-orbit coupled systems. However, UMR has never been observed in antiferromagnets before, given the absence of intrinsic spin-dependent scattering. Here, we report a UMR in the antiferromagnetic phase of a FeRh|Pt bilayer, which undergoes a sign change and then increases strongly with an increasing external magnetic field, in contrast to UMRs in ferromagnetic and nonmagnetic systems. We show that Rashba spin-orbit coupling alone cannot explain the sizable UMR in the antiferromagnetic bilayer and that field-induced spin canting distorts the Fermi contours to greatly enhance the UMR by two orders of magnitude. Our results can motivate the growing field of antiferromagnetic spintronics, and suggest a route to the development of tunable antiferromagnet-based spintronics devices.

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The chiral Hall effect in canted ferromagnets and antiferromagnets

Cited by 25 publications

References 51 publications

Chiral response of spin spiral-states as the origin of chiral transport fingerprints of spin textures

Chiral response of spin spiral-states as the origin of chiral transport fingerprints of spin textures

Anomalous Hall Effect in Epitaxial Thin Films of the Hexagonal Heusler MnPtGa Noncollinear Hard Magnet

Unidirectional Magnetoresistance in Antiferromagnet/Heavy-metal bilayers

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