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arXiv 1007.2766cond-mat.mtrl-sci
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(Ga,Mn)As微棒磁各向异性的应变控制

Strain control of magnetic anisotropy in (Ga,Mn)As microbars

C. King, J. Zemen, K. Olejník, L. Horák, J. Haigh, V. Novák, J. Kučera, V. Holý, R. P. Campion, B. L. Gallagher, T. Jungwirth

摘要:

我们提出了一个实验和理论研究的磁晶各向异性的酒吧光刻成(Ga,Mn)作为外延层下生长的压缩晶格应变的阵列。用高分辨X射线衍射方法研究了(Ga,Mn)As微棒的结构特性。实验数据,表现出较强的应变松弛效应,是在良好的协议与有限元模拟。SQUID磁化测量进行研究的控制磁各向异性(Ga,Mn)As的光刻诱导的应变弛豫的微棒。基于(Ga,Mn)As铁磁自旋轨道耦合能带结构的平均场动力学交换模型,对各向异性进行了微观理论模拟.基于实验数据和理论模型之间的总体协议,我们得出结论,微图案化诱导的各向异性的磁晶,自旋轨道耦合的起源。

英文摘要:

We present an experimental and theoretical study of magnetocrystalline anisotropies in arrays of bars patterned lithographically into (Ga,Mn)As epilayers grown under compressive lattice strain. Structural properties of the (Ga,Mn)As microbars are investigated by high-resolution X-ray diffraction measurements. The experimental data, showing strong strain relaxation effects, are in good agreement with finite element simulations. SQUID magnetization measurements are performed to study the control of magnetic anisotropy in (Ga,Mn)As by the lithographically induced strain relaxation of the microbars. Microscopic theoretical modeling of the anisotropy is performed based on the mean-field kinetic-exchange model of the ferromagnetic spin-orbit coupled band structure of (Ga,Mn)As. Based on the overall agreement between experimental data and theoretical modeling we conclude that the micropatterning induced anisotropies are of the magnetocrystalline, spin-orbit coupling origin.

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