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Origin of the spin reorientation transitions in (Fe1-xCox)(2)B alloys

TitleOrigin of the spin reorientation transitions in (Fe1-xCox)(2)B alloys
Publication TypeJournal Article
Year of Publication2015
AuthorsBelashchenko, KD, Ke, LQ, Dane, M, Benedict, LX, Lamichhane, TN, Taufour, V, Jesche, A, Bud'ko, SL, Canfield, PC, Antropov, VP
JournalApplied Physics Letters
Date Published02
Type of ArticleArticle
ISBN Number0003-6951
Accession NumberWOS:000349845300048
KeywordsBorides, magnetocrystalline anisotropy

Low-temperature measurements of the magnetocrystalline anisotropy energy K in (Fe1-xCox)(2)B alloys are reported, and the origin of this anisotropy is elucidated using a first-principles electronic structure analysis. The calculated concentration dependence K(x) with a maximum near x = 0.3 and a minimum near x = 0.8 is in excellent agreement with experiment. This dependence is traced down to spin-orbital selection rules and the filling of electronic bands with increasing electronic concentration. At the optimal Co concentration, K depends strongly on the tetragonality and doubles under a modest 3% increase of the c/a ratio, suggesting that the magnetocrystalline anisotropy can be further enhanced using epitaxial or chemical strain. (C) 2015 AIP Publishing LLC.

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