Robust Antiskyrmion Phase in Bulk Tetragonal Mn–Pt(Pd)–Sn Heusler System Probed by Magnetic Entropy Change and AC‐Susceptibility Measurements

Magnetic skyrmions, topologically protected chiral spin textures having potential applications in data storage, are stabilized in certain magnetic materials with broken inversion symmetry. The existence of magnetic antiskyrmions has been recently demonstrated in thin plates of a tetragonal Heusler m...

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Bibliographic Details
Published in:Advanced functional materials 2019-06, Vol.29 (24), p.n/a
Main Authors: Jamaluddin, Sk, Manna, Subhendu K., Giri, Bimalesh, Madduri, P. V. Prakash, Parkin, Stuart S. P., Nayak, Ajaya K.
Format: Article
Language:English
Subjects:
Anomalies
antiskyrmions
Chemical composition
Crystal structure
Data storage
Entropy
Heusler materials
Hypothetical particles
Magnetic materials
Magnetic permeability
Materials science
Organic chemistry
Palladium
Particle theory
Phase transitions
Platinum
skyrmion
Symmetry
Thin plates
Tin compounds
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Summary:Magnetic skyrmions, topologically protected chiral spin textures having potential applications in data storage, are stabilized in certain magnetic materials with broken inversion symmetry. The existence of magnetic antiskyrmions has been recently demonstrated in thin plates of a tetragonal Heusler material with D2d crystal symmetry. Here, the robust nature of the antiskyrmion phase in bulk tetragonal Mn–Pt(Pd)–Sn compounds by utilizing magnetic entropy change and AC‐susceptibility measurements is shown. It is found that the formation of the antiskyrmion phase is accompanied by a positive magnetic entropy change, which is supported by the concomitant observation of an anomaly in AC‐susceptibility measurements. Supporting these findings, no anomalies are found in AC‐susceptibility and magnetic entropy change measurements for a Mn–Pt(Pd)–Sn compound that is stabilized in the cubic phase by slight changes in chemical composition, thereby showing the robustness of the antiskyrmion phase to the D2d crystal structure. An unambiguous identification of a robust antiskyrmion phase in bulk tetragonal Mn–Pt(Pd)–Sn Heuslers with D2d crystal symmetry is shown to access by a positive magnetic entropy change (ΔSM > 0) and strong peak‐kind anomalies in the field‐dependent ac‐susceptibility measurements. By contrast, no such anomalies are obtained in the cubic Mn–Pt–Sn materials, signifying the importance of D2d symmetry to host antiskyrmion lattice.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201901776