Solid-phase synthesis of L10-FePd(001) epitaxial thin films: Structural transformations and magnetic anisotropy
Solid-phase synthesis of L10-FePd(001) epitaxial thin films: Structural transformations and magnetic anisotropy
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L10-FePd(001)外延薄膜的固相合成：结构转变和磁各向异性
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
G. Bondarenko
中科院分区：
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作者：
V. Myagkov;V. S. Zhigalov;L. Bykova;L. A. Solov’ev;G. Bondarenko
实验研究了Fe（001）/Pd（001）外延膜中L10-FePd硬磁相的固相合成。在450°C时，在Fe/Pd界面处开始形成三种类型的L10-FePd有序微晶，其c轴与MgO（001）衬底的100 nm方向一致。在退火温度增加到500°C之后，发生结构重排，并且引起具有垂直于膜平面的c轴的L10-FePd微晶的主要生长。10小时退火后，这种微晶的分数成为主导，导致大的垂直各向异性。确定了L10-FePd相的第一磁晶各向异性常数，并估算了第二磁晶各向异性常数。结果表明，L10-FePd（001）基面的磁各向异性不能用四轴晶体的双轴各向异性来描述。高于500°C的退火导致L10-FePd演变成无序的立方相。
The solid-phase synthesis of the L10-FePd magnetically hard phase in Fe(001)/Pd(001) epitaxial films has been experimentally investigated. The formation of three types of L10-FePd ordered crystallites whose c axes coincide with the 〈100〉 directions of the MgO(001) substrate begins at the Fe/Pd interface at a temperature of 450°C. After an increase in the annealing temperature to 500°C, structural rearrangement occurs and gives rise to the predominant growth of L10-FePd crystallites with the c axis perpendicular to the film plane. After 10-h annealing, the fraction of such crystallites becomes dominant, leading to large perpendicular anisotropy. The first magnetocrystalline-anisotropy constant of the L10-FePd phase has been determined and the second constant has been estimated. It has been shown that magnetic anisotropy in the L10-FePd(001) basal plane cannot be described by the biaxial anisotropy of the tetragonal crystal. The annealing above 500°C results in the evolution of L10-FePd to a disordered cubic phase.