Magnetic anisotropy and microstructure in molecular beam epitaxial FePt(110)/MgO(110)
Magnetic anisotropy and microstructure in molecular beam epitaxial FePt(110)/MgO(110)
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DOI：
10.1063/1.368158
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发表时间：
1998-07-15
影响因子：
3.2
通讯作者：
McCartney, MR
中科院分区：
文献类型：
--
作者：
Farrow, RFC;Weller, D;McCartney, MR
我们比较了在300 ℃和500 ℃下通过分子束外延在MgO（110）衬底上生长的FexPt 1-x（x = 0.6）薄膜的生长、结构和磁性。在两个温度下生长产生具有FePt，Pt [001]//MgO[001]和FePt，Pt（110）//MgO（110）的几乎单一取向的外延膜。对于在300 ℃下的生长，L1（0）（CuAu I）四方相的化学有序化是不完全的（长程有序参数，S = 0.38），而在500 ℃下的生长则几乎完全有序化（S = 0.81）。尽管不完全的化学有序性，但在300 ℃下生长的薄膜存在大的双重面内磁各向异性（K-u = 1.5 × 10（7）erg/cm（3））。300摄氏度的薄膜的透射电子显微镜证实了外延生长，几乎没有扩展的缺陷，但也揭示了化学有序分布不均匀的他。有序化的方向通常是均匀的（c轴沿着MgO [001]），但是在1-10 nm的长度尺度上有序化程度的变化是明显的。(C)1998年美国物理学会。[S0021-8979（98）01214-6]。
We compare the growth, structural, and magnetic properties of FexPt1-x(x similar or equal to 0.6) films grown by molecular beam epitaxy on MgO (110) substrates held at 300 and 500 degrees C. Growth at both temperatures yields nearly single orientation epitaxial films with FePt, Pt [001]//MgO[001] and FePt, Pt (110)//MgO (110). For growth at 300 degrees C, chemical ordering to the L1(0) (CuAu I) tetragonal phase is incomplete (long-range order parameter, S = 0.38) in contrast with growth at 500 degrees C for which ordering is nearly complete (S = 0.81). Despite incomplete chemical ordering, a large two-fold, in-plane magnetic anisotropy (K-u = 1.5 X 10(7) erg/cm(3)) is present for the film grown at 300 degrees C. Transmission electron microscopy for the 300 degrees C film confirms epitaxial growth with few extended defects but also reveals that chemical ordering is distributed inhomogeneously within the him. The direction of ordering is generally uniform (c axis along MgO [001]) but variations in the degree of ordering are evident on a length scale of 1-10 nm. (C) 1998 American Institute of Physics. [S0021-8979(98)01214-6].