Large topological Hall effect in the non-collinear phase of an antiferromagnet

Sürgers, Christoph; Fischer, G.; Winkel, Patrick; Löhneysen, H. v.

doi:10.1038/ncomms4400

Cited by 211 publications

(213 citation statements)

References 49 publications

(68 reference statements)

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“…32 In addition, we discuss data obtained on a 40-nm film which have been published earlier. 20 The hexagonal structure of the polycrystalline film was confirmed by x-ray diffraction. Sputtered films prepared under the same conditions have a coarse-grained morphology with a grain size less than 100 nm.…”

Section: Methodsmentioning

confidence: 75%

“…In fact, an extra contribution to the AHE caused by the noncollinear magnetic structure and attributed to a THE has been reported for Mn 5 Si 3 films. 20 Noncollinearity may also be stabilized in the isostructural ferromagnet Mn 5 Ge 3 by uniaxial distortion. 21 Mn 5 Ge 3 and Mn 5 Ge 3 C x (x ≈ 1) have been proposed as ferromagnetic electrodes for spintronic applications due to their ability to grow epitaxially on Si and GaAs substrates.…”

Section: A Hall Effect In Noncollinear Magnetic Structuresmentioning

confidence: 99%

“…Magnetic fields H * and H c determined from the Hall effect for the single crystal (increasing field-sweep) with H oriented perpendicularly to the crystallographic c axis (square symbols), and H * of the 160-nm and 40-nm thick films. 20 Triangles indicate H c observed in M(H ).…”

Section: B Single Crystalmentioning

confidence: 99%

“…(1)) using the whole set of magnetotransport data with focus on the high-field regime and assuming A possible additional contribution varying only linearly with ρ xx due to skew scattering does not change the obtained values R 0 and S H due to the high resistivity of the film 20 and is therefore not further taken into account. The inset in Fig.…”

Section: A Thin Filmsmentioning

confidence: 99%

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Anomalous Hall effect in the noncollinear antiferromagnet Mn5Si3

et al. 2016

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Metallic antiferromagnets with noncollinear orientation of magnetic moments provide a playground for investigating spin-dependent transport properties by analysis of the anomalous Hall effect. The intermetallic compound Mn 5 Si 3 is an intinerant antiferromagnet with collinear and noncollinear magnetic structures due to Mn atoms on two inequivalent lattice sites. Here, magnetotransport measurements on polycrstalline thin films and a single crystal are reported. In all samples, an additional contribution to the anomalous Hall effect attributed to the noncollinear arrangment of magnetic moments is observed. Furthermore, an additional magnetic phase between the noncollinear and collinear regimes above a metamagnetic transition is resolved in the single crystal by the anomalous Hall effect. C 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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Section: Methodsmentioning

confidence: 75%

Section: A Hall Effect In Noncollinear Magnetic Structuresmentioning

confidence: 99%

Section: B Single Crystalmentioning

confidence: 99%

Section: A Thin Filmsmentioning

confidence: 99%

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Anomalous Hall effect in the noncollinear antiferromagnet Mn5Si3

et al. 2016

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“…Therefore, we believe that a finite thermal Hall effect in these magnets should be attributed to scalar spin chirality as opposed to the DMI. A similar effect in frustrated electronic (metallic) magnets is known as topological or spontaneous Hall effect [53][54][55][56][57] with or without the magnetic field respectively. The present model is an analog of this effect in quantum magnets with charge-neutral magnetic spin excitations.…”

Section: Arxiv:160804561v12 [Cond-matstr-el] 16 Jan 2017mentioning

confidence: 99%

Topological thermal Hall effect in frustrated kagome antiferromagnets

Owerre

2017

Phys. Rev. B

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In frustrated magnets the Dzyaloshinsky-Moriya interaction (DMI) arising from spin-orbit coupling (SOC) can induce a magnetic long-range order. Here, we report a theoretical prediction of thermal Hall effect in frustrated kagomé magnets such as KCr3(OH)6(SO4)2 and KFe3(OH)6(SO4)2. The thermal Hall effects in these materials are induced by scalar spin chirality as opposed to DMI in previous studies. The scalar spin chirality originates from magnetic-field-induced chiral spin configuration due to non-coplanar spin textures, but in general it can be spontaneously developed as a macroscopic order parameter in chiral quantum spin liquids. Therefore, we infer that there is a possibility of thermal Hall effect in frustrated kagomé magnets such as herbertsmithite ZnCu3(OH)6Cl2 and the chromium compound Ca10Cr7O28, although they also show evidence of magnetic long-range order in the presence of applied magnetic field or pressure.Introduction-. Topological phases of matter are an active research field in condensed matter physics, mostly dominated by electronic systems. Quite recently the concepts of topological matter have been extended to nonelectronic bosonic systems such as quantized spin waves (magnons) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and quantized lattice vibrations (phonons) [18][19][20][21][22][23]. In the former, spin-orbit coupling manifests in the form of Dzyaloshinsky-Moriya interaction [24,25] and it leads to topological spin excitations and chiral edge modes in collinear ferromagnets [5,6]. The quantized spin waves or magnons are charge-neutral quasiparticles and they do not experience a Lorentz force as in charge particles. However, a temperature gradient can induce a heat current and the DMI-induced Berry curvature acts as an effective magnetic field in momentum space. This leads to a thermal version of the Hall effect characterized by a temperature dependent thermal Hall conductivity [1,3]. Thermal Hall effect is now an emerging active research area for probing the topological nature of magnetic spin excitations in quantum magnets. The thermal Hall effect of spin waves has been realized experimentally in a number of pyrochlore ferromagnets [2,4]. Recently, DMI-induced topological magnon bands and thermal Hall effect have been observed in collinear kagomé ferromagnet Cu(1-3, bdc) [8,9].In frustrated kagomé magnets, however, there is no magnetic long-range order (LRO) down to the lowest accessible temperatures. The classical ground states have an extensive degeneracy and they are considered as candidates for quantum spin liquid (QSL) [26,27]. The ground state of spin-1/2 Heisenberg model on the kagomé lattice is believed to be a U(1)-Dirac spin liquid [28]. In physical realistic materials, however, there are other interactions and perturbations that tend to alleviate QSL ground states and lead to LRO. Recent experimental syntheses of kagomé antiferromagnetic materials have shown that the effects of SOC or DMI are not negligible in frustrated magnets. The DMI is an intrinsic pertur...

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Controlling Chiral Spin States of a Triangular‐Lattice Magnet by Cooling in a Magnetic Field

Deng

Fischer

Uhlarz

et al. 2019

Adv Funct Materials

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Magnetic materials with a non‐collinear and non‐coplanar arrangement of magnetic moments hosting a nonzero scalar spin‐chirality exhibit unique magnetic and spin‐dependent electronic transport properties. The spin chirality often occurs in materials where competing exchange interactions lead to geometrical frustrations between magnetic moments and to a strong coupling between the crystal lattice and the magnetic structure. These characteristics are particularly strong in Mn‐based antiperovskites where the interactions and chirality can be tuned by substitutional modifications of the crystalline lattice. This study presents evidence for the formation of two unequal chiral spin states in magnetically ordered Mn3.338Ni0.651N antiperovskite based on density functional theory calculations and supported by magnetization measurements after cooling in a magnetic field. The existence of two scalar spin‐chiralities of opposite sign and different magnitude is demonstrated by a vertical shift of the magnetic‐field dependent magnetization and Hall effect at low fields and from an asymmetrical magnetoresistivity when the applied magnetic field is oriented parallel or antiparallel to the direction of the cooling field. This opens up the possibility of manipulating the spin chirality for potential use in the emerging field of chiral spintronics.

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Large topological Hall effect in the non-collinear phase of an antiferromagnet

Cited by 211 publications

References 49 publications

Anomalous Hall effect in the noncollinear antiferromagnet Mn5Si3

Anomalous Hall effect in the noncollinear antiferromagnet Mn5Si3

Topological thermal Hall effect in frustrated kagome antiferromagnets

Controlling Chiral Spin States of a Triangular‐Lattice Magnet by Cooling in a Magnetic Field

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