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Tetragonal Superstructure of the Antiskyrmion Hosting Heusler Compound Mn_1.4PtSn.

ABSTRACT: Skyrmions in non-centrosymmetric magnets are vortex-like spin arrangements, viewed as potential candidates for information storage devices. The crystal structure and noncollinear magnetic structure together with magnetic and spin-orbit interactions define the symmetry of the skyrmion structure. We outline the importance of these parameters in the Heusler compound Mn_1.4PtSn which hosts antiskyrmions, a vortex-like spin texture related to skyrmions. We overcome the challenge of growing large micro-twin-free single crystals of Mn_1.4PtSn, which has proved to be the bottleneck for realizing bulk skyrmionic/antiskyrmionic states in a compound. The use of 5d-transition metal, platinum, together with manganese as constituents in the Heusler compound such as Mn_1.4PtSn is a precondition for the noncollinear magnetic structure. Because of the tetragonal inverse Heusler structure, Mn_1.4PtSn exhibits large magneto-crystalline anisotropy and D _2d symmetry, which are necessary for antiskyrmions. The superstructure in Mn_1.4PtSn is induced by Mn-vacancies, which enable a ferromagnetic exchange interaction to occur. Mn_1.4PtSn, the first known tetragonal Heusler superstructure compound, opens up a new research direction for properties related to the superstructure in a family containing thousands of compounds.

SUBMITTER: Vir P

PROVIDER: S-EPMC6694724 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Tetragonal Superstructure of the Antiskyrmion Hosting Heusler Compound Mn<sub>1.4</sub>PtSn.

Vir Praveen P Kumar Nitesh N Borrmann Horst H Jamijansuren Bayardulam B Kreiner Guido G Shekhar Chandra C Felser Claudia C

Chemistry of materials : a publication of the American Chemical Society 20190711 15

Skyrmions in non-centrosymmetric magnets are vortex-like spin arrangements, viewed as potential candidates for information storage devices. The crystal structure and noncollinear magnetic structure together with magnetic and spin-orbit interactions define the symmetry of the skyrmion structure. We outline the importance of these parameters in the Heusler compound Mn<sub>1.4</sub>PtSn which hosts antiskyrmions, a vortex-like spin texture related to skyrmions. We overcome the challenge of growing ...[more]

PMID: 31423051

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Project description:In this work, two kinds of competition between different Heusler structure types are considered, one is the competition between XA and L21 structures based on the cubic system of full-Heusler alloys, Pd2 YZ (Y = Co, Fe, Mn; Z = B, Al, Ga, In, Tl, Si, Ge, Sn, Pb, P, As, Sb). Most alloys prefer the L21 structure; that is, Pd atoms tend to occupy the a (0, 0, 0) and c (0.5, 0.5, 0.5) Wyckoff sites, the Y atom is generally located at site b (0.25, 0.25, 0.25), and the main group element Z has a preference for site d (0.75, 0.75, 0.75), meeting the well known site-preference rule. The difference between these two cubic structures in terms of their magnetic and electronic properties is illustrated further by their phonon dispersion and density-of-states curves. The second type of competition that was subjected to systematic study was the competitive mechanism between the L21 cubic system and its L10 tetragonal system. A series of potential tetragonal distortions in cubic full-Heusler alloys (Pd2 YZ) have been predicted in this work. The valley-and-peak structure at, or in the vicinity of, the Fermi level in both spin channels is mainly attributed to the tetragonal ground states according to the density-of-states analysis. ΔE M is defined as the difference between the most stable energy values of the cubic and tetragonal states; the larger the value, the easier the occurrence of tetragonal distortion, and the corresponding tetragonal structure is stable. Compared with the ΔE M values of classic Mn2-based tetragonal Heusler alloys, the ΔE M values of most Pd2CoZ alloys in this study indicate that they can overcome the energy barriers between cubic and tetragonal states, and possess possible tetragonal transformations. The uniform strain has also been taken into consideration to further investigate the tetragonal distortion of these alloys in detail. This work aims to provide guidance for researchers to further explore and study new magnetic functional tetragonal materials among the full-Heusler alloys.

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Tetragonal Superstructure of the Antiskyrmion Hosting Heusler Compound Mn_1.4PtSn.

Publications

Tetragonal Superstructure of the Antiskyrmion Hosting Heusler Compound Mn<sub>1.4</sub>PtSn.

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Tetragonal Superstructure of the Antiskyrmion Hosting Heusler Compound Mn1.4PtSn.

Publications

Tetragonal Superstructure of the Antiskyrmion Hosting Heusler Compound Mn<sub>1.4</sub>PtSn.

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OmicsDI is part of the ELIXIR infrastructure

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Tetragonal Superstructure of the Antiskyrmion Hosting Heusler Compound Mn_1.4PtSn.