Magnetic anisotropy engineering in in-plane magnetized ultrathin ferromagnetic films (invited)
Magnetic anisotropy engineering in in-plane magnetized ultrathin ferromagnetic films (invited)
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面内磁化超薄铁磁薄膜的磁各向异性工程（特邀）
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
P. Bode
中科院分区：
文献类型：
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作者：
J. Bland;S. Hope;B. Choi;P. Bode
我们利用磁光克尔效应研究了室温下在暴露于 CO 的 Co/Cu(110) 体系上沉积亚单层数量的 Cu 的效果。研究发现，对于厚度高达 40 ML 的所有 Co 厚度，Cu 覆盖层可以完全逆转由 CO 吸附引起的面内 90° 易轴转换。 Cu 反转有效面内单轴各向异性 KUeff 的符号，从而将易磁化轴从 [1-10] 方向切换到 [001] 方向。根据立方磁晶各向异性常数 K1 的大小，观察到两种切换模式，而立方磁晶各向异性常数 K1 又取决于 Co 膜的厚度。对于足够厚的Co薄膜（dCo>15 ML），由于立方各向异性和有效单轴各向异性贡献之间的竞争，发现易轴逐渐从[1-10]方向移动到[001]方向。因此，我们能够控制地设计该系统中易轴的方向作为铜覆盖层厚度的函数。对于 Co 薄膜（dCu...
We have studied the effect of depositing submonolayer quantities of Cu onto the CO exposed Co/Cu(110) system at room temperature using the magneto-optic Kerr effect. Cu overlayers are found to completely reverse the in-plane 90° easy axis switch caused by the CO adsorption, for all Co thicknesses studied up to 40 ML. The Cu reverses the sign of the effective in-plane uniaxial anisotropy KUeff thereby switching the easy axis from the [1-10] to the [001] direction. Two modes of switching are observed depending on the magnitude of the cubic magnetocrystalline anisotropy constant K1 which is in turn dependent on the thickness of the Co films. For sufficiently thick Co films (dCo>15 ML), the easy axis is found to shift gradually from the [1-10] to the [001] direction due to the competition between the cubic and effective uniaxial anisotropy contributions. Therefore, we are able to controllably engineer the direction of the easy axis in this system as a function of Cu overlayer thickness. For thin Co films (dCu...