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Tunable dimensional crossover and magnetocrystalline anisotropy in Fe2P-based alloys

TitleTunable dimensional crossover and magnetocrystalline anisotropy in Fe2P-based alloys
Publication TypeJournal Article
Year of Publication2017
AuthorsZhuravlev, IA, Antropov, VP, Vishina, A, van Schilfgaarde, M, Belashchenko, KD
JournalPhysical Review Materials
Date Published10
Type of ArticleArticle
ISBN Number2475-9953
Accession NumberWOS:000416586100001
Keywords(fe1-xnix)2p, crystal, fe2p, magnetic-properties, mossbauer, neutron-diffraction, ni, phosphides

Electronic structure calculations are used to examine the magnetic properties of Fe2P-based alloys and the mechanisms through which the Curie temperature andmagnetocrystalline anisotropy can be optimized for specific applications. It is found that at elevated temperatures the magnetic interaction in pure Fe2P develops a pronounced two-dimensional character due to the suppression of the magnetization in one of the sublattices, but the interlayer coupling is very sensitive to band filling and structural distortions. This feature suggests a natural explanation for the observed sharp enhancement of the Curie temperature by alloying with multiple elements, such as Co, Ni, Si, and B. The magnetocrystalline anisotropy is also tunable by electron doping, reaching a maximum near the electron count of pure Fe2P. These findings enable the optimization of the alloy content, suggesting coalloying of Fe2P with Co (or Ni) and Si as a strategy for maximizing the magnetocrystalline anisotropy at and above room temperature.

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