Control of c-Axis Orientation of L10 Ordered FePt, CoPt, and FePd Alloy Thin Films Deposited on MgO(001) Substrates
Control of c-Axis Orientation of L10 Ordered FePt, CoPt, and FePd Alloy Thin Films Deposited on MgO(001) Substrates
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MgO(001) 基底上沉积的 L10 有序 FePt、CoPt 和 FePd 合金薄膜 c 轴取向的控制
DOI：
10.1109/tmag.2014.2328624
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发表时间：
2014
影响因子：
2.1
通讯作者：
N. Inaba
中科院分区：
文献类型：
--
作者：
M. Ohtake;A. Itabashi;M. Futamoto;F. Kirino;N. Inaba
在(001)取向的底层或基底上形成的膜除了轴垂直于膜表面的(001)晶体之外还可以包括轴位于膜平面内的(100)晶体。本文在MgO(001)单晶衬底上制备了具有结构的FePt、CoPt和FePd合金薄膜。通过在 200 °C 低温沉积制备的无序结构磁性薄膜上引入薄 MgO 盖层，并在 600 °C 对双层薄膜进行退火，可以精确地将轴取向控制为垂直。在 MgO/(FePt, CoPt, FePd)/MgO 夹层结构中，相变优先沿垂直方向发生。此外，帽层促进有序化。有盖层和无盖层的 FePt、CoPt 和 FePd 薄膜的有序度分别为（0.82，0.58）、（0.36，0.30）和（0.72，0.62）。有盖层的 FePt 薄膜表现出很强的垂直磁各向异性和非常低的面内矫顽力，因为该薄膜不包含（100）晶体并具有高阶学位。
films formed on (001)-oriented underlayers or substrates may involve (100) crystal with the-axis lying in the film plane in addition to (001) crystal with the-axis normal to the film surface. In this paper, FePt, CoPt, and FePd alloy films withstructure are prepared on MgO(001) single-crystal substrates. The-axis orientation is accurately controlled to be perpendicular by introducing a thin MgO cap layer on magnetic films with disordered structure prepared by low-temperature deposition at 200 °C and by annealing the bilayer films at 600 °C. The phase transformation preferentially occurs along the perpendicular direction in the MgO/(FePt, CoPt, FePd)/MgO sandwich structures. Furthermore, the cap layer promotesordering. The order degrees of FePt, CoPt, and FePd films with and without cap layers, (,are (0.82, 0.58), (0.36, 0.30), and (0.72, 0.62), respectively. The FePt film with cap layer shows a strong perpendicular magnetic anisotropy and a very low in-plane coercivity because of which the film does not include(100) crystal and possesses a high-order degree.