Effect of Composition on the Ordered Phase Formation in Co-Pt Thin Film Deposited on MgO(111) Single-Crystal Substrate
Effect of Composition on the Ordered Phase Formation in Co-Pt Thin Film Deposited on MgO(111) Single-Crystal Substrate
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成分对 MgO(111) 单晶基底上沉积的 Co-Pt 薄膜有序相形成的影响
DOI：
10.1109/tmag.2014.2325876
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发表时间：
2014
影响因子：
2.1
通讯作者：
and Nobuyuki Inaba
中科院分区：
文献类型：
--
作者：
Mitsuru Ohtake;Daisuke Suzuki;Masaaki Futamoto;Fumiyoshi Kirino;and Nobuyuki Inaba
CoxPt 100-x（在。在300 °C加热的MgO（111）衬底上，通过改变Co含量从0到100，制备了具有平行于衬底表面的密排面的合金外延薄膜。定量测定了密排晶面的堆积顺序（面心立方和六方晶系的体积比）和有序度。富Pt和几乎等原子组成的薄膜主要由fcc晶体组成（）。随着增加值超过56，值急剧增加。富钴薄膜由hcp（）和fcc（）晶体组成。薄膜中含有亚稳有序相。从fcc和hcp晶体的体积比和有序度的观点出发，确定了随组成的增加，晶体结构为SFs（SFs：堆垛层错）SFs（）+ SFs。含有有序相的薄膜表现出很强的垂直磁各向异性。结果表明，当饱和磁化强度控制在600 ~ 1150 emu/cm范围内时，CoxPt 100-x薄膜的单轴磁晶各向异性能可保持在1000 ~ 1150 emu/cm。
CoxPt100-x(at. %) alloy epitaxial films with the close-packed plane parallel to the substrate surface are prepared on MgO(111) substrates heated at 300 °C by varying the Co content offrom 0 to 100. The stacking sequence of close-packed plane (the volume ratios of fcc and hcp crystals,and) and the order degree are quantitatively determined. The films with Pt-rich and nearly equiatomic compositions primarily consist of fcc crystals (). With increasing thevalue beyond 56, thevalue drastically increases. The films with Co-rich compositions consist of mixtures of hcp () and fcc () crystals. The films withinvolve metastable ordered phases. The order degree ofis kept constant around 0.25 in a compositional range ofFrom the viewpoints of volume ratios of fcc and hcp crystals and order degree, the crystal structure is determined to varySFs (SFs: stacking faults)SFs()+ SFs with increasing thevalue. The films including ordered phases show strong perpendicular magnetic anisotropies. It is shown that the uniaxial magnetocrystalline anisotropy energy of CoxPt100-xfilm can be kepterg/cmwhile controlling the saturation magnetization from 600 to 1150 emu/cm.