Out- versus in-plane magnetic anisotropy of free Fe and Co nanocrystals: Tight-binding and first-principles studies

Dongzhe Li, Cyrille Barreteau, Martin R. Castell, Fabien Silly, Alexander Smogunov

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    Abstract

    We report tight-binding and density functional theory calculations of magnetocrystalline anisotropy energy (MAE) of free Fe (body-centered-cubic) and Co (face-centered-cubic) slabs and nanocrystals. The nanocrystals are truncated square pyramids which can be grown experimentally by deposition of metal on a SrTiO3(001) substrate. For both elements our local analysis shows that the totalMAE of the nanocrystals is largely dominated by the contribution of (001) facets. However, while the easy axis of Fe(001) is out-of-plane, it is in-plane for Co(001). This has direct consequences on the magnetic reversal mechanism of the nanocrystals. Indeed, the very high uniaxial anisotropy of Fe nanocrystals makes them a much better potential candidate for magnetic storage devices.
    Original languageEnglish
    JournalPhysical Review B
    Volume90
    Issue number20
    Pages (from-to)205409
    Number of pages8
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2014

    Bibliographical note

    ©2014 American Physical Society

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