Topological Hall effect in thin films of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mrow><mml:mn>1.5</mml:mn></mml:mrow></mml:msub><mml:mi>PtSn</mml:mi></mml:mrow></mml:math>

Swekis, Peter; Μάρκου, Αναστάσιος; Kriegner, Dominik; Gayles, Jacob; Schlitz, Richard; Schnelle, Walter; Goennenwein, Sebastian T. B.; Felser, Claudia

doi:10.1103/physrevmaterials.3.013001

Cited by 36 publications

(57 citation statements)

References 35 publications

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“…In addition, microstructural defects like twins and grain boundaries of the polycrystalline samples may also act as pinning centers to stabilize the aSKs. Previous reports on analogous Heusler compounds, e.g., bulk Mn 2 PtSn [44] and thin films of Mn 2 PtSn [45], Mn 2−x PtSn [46], and Mn 2 RhSn [47] also revealed a THE but did not show an inverse hysteresis in the ρ yx loop. In Fig.…”

Section: Topological Hall Effectmentioning

confidence: 70%

Detection of antiskyrmions by topological Hall effect in Heusler compounds

Kumar

Reehuis

et al. 2020

Phys. Rev. B

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Heusler compounds having D2d crystal symmetry gained much attention recently due to the stabilization of a vortex-like spin texture called antiskyrmions in thin lamellae of Mn1.4Pt0.9Pd0.1Sn as reported in the work of Nayak et al. [Nature 548, 561 (2017)]. Here we show that bulk Mn1.4Pt0.9Pd0.1Sn undergoes a spin-reorientation transition from a collinear ferromagnetic to a non-collinear configuration of Mn moments below 135 K, which is accompanied by the emergence of a topological Hall effect. We tune the topological Hall effect in Pd and Rh substituted Mn1.4PtSn Heusler compounds by changing the intrinsic magnetic properties and spin textures. A unique feature of the present system is the observation of a zerofield topological Hall resistivity with a sign change which indicates the robust formation of antiskyrmions. I. INTRODUCTIONTopological magnetic textures show promise in many areas of technology, such as racetrack memory [1,2] and neuromorphic computing [3,4], due to the unique transport properties that allow for efficient manipulation [5,6] and detection [7,8] of the magnetic textures. This is a consequence of the real space Berry curvature of the topological texture that can be tuned by the electronic structure [9,10]. One such topological texture is the skyrmion [11,12] which is found in chiral magnets [13] with a unit integer topological charge.Recently antiskyrmions (aSKs) [14], the anti-particles of the skyrmions, were stabilized in thin lamellae of the tetragonal inverse Heusler compound Mn1.4Pt0.9Pd0.1Sn for a broader field range and even above room temperature [15]. In this compound (D2d symmetry class), the Dzyaloshinskii-Moriya interaction (DMI) is anisotropic where the DM vectors along the x and y directions in the basal plane are of opposite sign and hence cause the stability of the aSKs [16]. The in-plane winding of the spin texture for an aSK is anisotropic with an opposite topological charge as compared to that of the azimuthally symmetric Bloch and Néel skyrmion of the same charge [17]. The topological winding induces a real space Berry curvature that strongly influences all transport properties [18]. The topological Hall effect (THE) is one such electrical transport property that has been intrinsically linked to the skyrmions [8]. The THE results in a further component of the total Hall signal, in addition to the normal Hall and the magnetization-scaled anomalous Hall components [19]. It arises due to the emergent magnetic field which is a result of the finite Berry phase contributions from either II. EXPERIMENT Polycrystalline ingots of Mn1.4Pt1-xPdxSn (x = 0, 0.1 … 0.3) and Mn1.4Pt1-yRhySn (y = 0.1, 0.2 … 0.8) with the stoichiometric amounts of constituent elements were prepared by arcmelting in the presence of Ar atmosphere. The synthesized ingots were sealed in an evacuated quartz tube and annealed at 873 K (Pd-substituted samples) and 1073 K (parent compound Mn1.4PtSn and Rh-substituted samples) for 7 days followed by quenching into an ice-water mixture. The phase purity and the cryst...

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Section: Topological Hall Effectmentioning

confidence: 70%

Detection of antiskyrmions by topological Hall effect in Heusler compounds

Kumar

Reehuis

et al. 2020

Phys. Rev. B

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“…This spin chirality generates an effective electromagnetic field for electrons through the spin Berry phase mechanism. The resulting Hall effect, known as the Topological Hall (TH) effect, has been observed in perovskite oxides [9][10][11][12], chiral magnets [13,14], frustrated magnets [15], and Heusler alloys [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Topological Hall effect and emergent skyrmion crystal at manganite-iridate oxide interfaces

2019

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Scalar spin chirality is expected to induce a finite contribution to the Hall response at low temperatures. We study this spin-chirality-driven Hall effect, known as the topological Hall effect, at the manganite side of the interface between La1−xSrxMnO3 and SrIrO3. The ferromagnetic doubleexchange hopping at the manganite layer, in conjunction with the Dzyaloshinskii-Moriya (DM) interaction which arises at the interface due to broken inversion symmetry and strong spin-orbit coupling from the iridate layer, could produce a skyrmion-crystal (SkX) phase in the presence of an external magnetic field. Using the Monte Carlo technique and a two-orbital spin-fermion model for manganites, supplemented by an in-plane DM interaction, we obtain phase diagrams which reveal at low temperatures a clear SkX phase and also a low-field spin-spiral phase. Increasing temperature, a skyrmion-gas phase, precursor of the SkX phase upon cooling, was identified. The topological Hall effect primarily appears in the SkX phase, as observed before in oxide heterostructures. We conclude that the manganite-iridate superlattices provide another useful platform to explore a plethora of unconventional magnetic and transport properties. arXiv:1905.09887v2 [cond-mat.str-el]

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“…The magnetic properties in spin glasses revealed that chiral magnetic interactions between neighboring spins can also play a key role in metallic systems. The RKKY model was extended to 3-sites to the bilayer systems has been predicted by [18] that a large Dzyaloshinskii-Moriya interaction (DMI) with magnetic film and a heavy material with large spin-orbit coupling. The best solution up to now seems to increase the effective magnetic volume by using multilayer stacks composed of multiple repetitions of thin magnetic metal layers separated by heavy metal nonmagnetic layers grown by sputtering deposition.…”

Section: Multilayer Thin Filmsmentioning

confidence: 99%

Skyrmions in Thin Films, Interfaces and Antiferromagnetism

Rajagopal¹

2021

Magnetic Skyrmions

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Magnetic skyrmions are small whirling topological defects in a texture magnetization state. Their stabilization and dynamics depend strongly on their topological properties. Skyrmions are induced by non-centrosymmetric crystal structure of magnetic compounds and thin films. Skyrmions are extremely small, with diameters in the nanometer range, and behave as particles that can be created, moved and annihilated. This makes them suitable for information storage and logic technologies. Skyrmions had been observed only at low temperature, and mostly under large applied magnetic fields. An intense research in this field has led to the identification of skyrmions in thin-film and multilayer structures in these heterostrutres skyrmions are able to survive at room temperature and can be manipulated by electrical currents. Utilizing interlayer magnetic exchange bias with synthetic antiferromagnet with can be used to isolated antiferromagnetic skyrmions at room temperature. The development of skyrmion-based topological spintronics holds promise for applications in the writing, processing and reading functionalities at room temperature and can be extended further to all-electrical manipulation spintronics.

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Topological Hall effect in thin films of Mn1.5PtSn

Cited by 36 publications

References 35 publications

Detection of antiskyrmions by topological Hall effect in Heusler compounds

Detection of antiskyrmions by topological Hall effect in Heusler compounds

Topological Hall effect and emergent skyrmion crystal at manganite-iridate oxide interfaces

Skyrmions in Thin Films, Interfaces and Antiferromagnetism

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