Out- versus in-plane magnetic anisotropy of free Fe and Co nanocrystals: Tight-binding and first-principles studies
Out- versus in-plane magnetic anisotropy of free Fe and Co nanocrystals: Tight-binding and first-principles studies
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DOI：
10.1103/physrevb.90.205409
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发表时间：
2014-07
影响因子：
3.7
通讯作者：
Dongzhe Li;C. Barreteau;M. R. Castell;F. Silly;A. Smogunov
中科院分区：
文献类型：
--
作者：
Dongzhe Li;C. Barreteau;M. R. Castell;F. Silly;A. Smogunov
©2014美国物理学会。我们报道了自由铁（体心立方）和钴（面心立方）板和纳米晶体的磁晶各向异性能（MAE）的紧密结合和密度泛函理论计算。该纳米晶体是截断的方形金字塔，可以通过在SrTiO3（001）衬底上沉积金属来生长。对于这两种元素，我们的局部分析表明，纳米晶体的总MAE在很大程度上由（001）面的贡献主导。然而，Fe（001）的易轴是平面外的，而Co（001）的易轴是平面内的。这对纳米晶体的磁反转机制有直接的影响。事实上，铁纳米晶体非常高的单轴各向异性使它们成为磁性存储器件的更好的潜在候选者。
© 2014 American Physical Society. 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 total MAE 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.