Epitaxial Fe films on GaAs(001): Does the substrate surface reconstruction affect the uniaxial magnetic anisotropy?
Epitaxial Fe films on GaAs(001): Does the substrate surface reconstruction affect the uniaxial magnetic anisotropy?
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DOI：
10.1063/1.1447205
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发表时间：
2002-05
影响因子：
3.2
通讯作者：
R. Moosbühler;F. Bensch;M. Dumm;G. Bayreuther
中科院分区：
文献类型：
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作者：
R. Moosbühler;F. Bensch;M. Dumm;G. Bayreuther
在GaAs（001）上外延生长的Fe薄膜的面内磁各向异性，除了厚度相关的四倍贡献外，还有来自Fe/GaAs界面的单轴分量。这在以前的几项调查中已经观察到。然而，在大多数研究中，发现单轴易轴（e.a）的方向沿[110]方向，但也有少数病例报道平行于[−110]方向的e.a。有人认为，在铁沉积之前，GaAs表面的不同重建可能是造成这种差异的原因。在本文中，研究表明，在室温下，在富ga的GaAs（001）表面上通过分子束外延生长的Fe（001）薄膜中，单轴各向异性总是沿其易轴[110]，其大小几乎相同。特别是，GaAs衬底的表面重建- （4×2）或（2×6） -对产生的单轴磁各向异性没有影响。这[连同最近有关…的研究结果]
The in-plane magnetic anisotropy of Fe films epitaxially grown on GaAs(001), in addition to a thickness-dependent four-fold contribution has a uniaxial component originating from the Fe/GaAs interface. This has been observed in several previous investigations. The orientation of the uniaxial easy axis (e.a.), however, was found to be along the [110] direction in most studies, but also an e.a. parallel to [−110] was reported in a few cases. It has been suggested that different reconstructions of the GaAs surface prior to Fe deposition could be responsible for this discrepancy. In the present contribution, it is shown that in Fe(001) films grown by molecular-beam epitaxy on Ga-rich GaAs(001) surfaces at room temperature the uniaxial anisotropy always has its easy axis along [110] with practically the same magnitude. In particular, the surface reconstruction of the GaAs substrate — either (4×2) or (2×6) — has no effect on the resulting uniaxial magnetic anisotropy. This [together with recent results related ...