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Element-resolved magnetism across the temperature- and pressure-induced spin reorientation in MnBi

TitleElement-resolved magnetism across the temperature- and pressure-induced spin reorientation in MnBi
Publication TypeJournal Article
Year of Publication2016
AuthorsChoi, YS, Jiang, XJ, Bi, WL, Lapa, P, Chouhan, RK, Paudyal, D, Varga, T, Popov, D, Cui, J, Haskel, D, Jiang, JS
JournalPhysical Review B
Date Published11
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000388816200007
Keywordsbi, edge, electronic-structure, full-potential calculations, intermetallic compound, iron, magnetooptical properties, mnsb, physics, ray circular-dichroism, transformation

Rare-earth free permanent magnet MnBi (NiAs-type crystal structure) displays strong uniaxial magnetic anisotropy above its similar to 90 K spin reorientation transition (SRT). X-ray magnetic circular dichroism (XMCD) measurements at the Mn K and Bi L-2,(3) edges show induced magnetism in Bi, which is strongly coupled to the magnetism of Mn. Temperature- and pressure-dependent XMCD results reveal that hydrostatic pressure mimics the effect of temperature, driving a transition from uniaxial to in-plane anisotropy. The pressure and temperature transitions are shown to be connected to an anisotropic lattice contraction in NiAs-type structures. Temperature and pressure, hence, induce coupled structural and magnetic responses, highlighting the importance of both anisotropic lattice change and Mn-Bi hybridization in leading to the magnetic anisotropy change across the SRT. The dependence of magnetic anisotropy on the anisotropic lattice change is confirmed by density functional theory.

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Alternate JournalPhys. Rev. B