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arXiv 2009.12941cond-mat.mtrl-sci
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电场对Pd/Co/Pt薄膜磁性影响的理论研究

Theoretical study on the electric field effect on magnetism of Pd/Co/Pt thin films

Eszter Simon, Alberto Marmodoro, Sergiy Mankovsky, Hubert Ebert

摘要:

基于第一性原理计算,我们研究了$(001)$ /Co/Pt薄膜结构中Pt层在外加电场作用下的电磁性质.由于Co底层,表面Pt层具有通过外部电场修改的感应力矩。场诱导的变化可以解释由修改后的自旋相关轨道杂化随场强的非线性变化。我们计算的X射线吸收和X射线磁圆二色光谱的外加电场和检查其影响的光谱在Pt层周围的L $_{2}$和L $_{3}$边缘。我们还确定了层相关的磁晶各向异性,并表明各向异性可以很容易地在不同的层由外部电场调谐。

英文摘要:

Based on first principles calculations we investigate the electronic and magnetic properties of Pt layers in Pd$(001)$/Co/Pt thin film structures exposed to an external electric field. Due to the Co underlayer, the surface Pt layers have induced moments that are modified by an external electric field. The field induced changes can be explained by the modified spin-dependent orbital hybridization that varies non-linearly with the field strength. We calculate the x-ray absorption and the x-ray magnetic circular dichroism spectra for an applied external electric field and examine its impact on the spectra in the Pt layer around the L$_{2}$ and L$_{3}$ edges. We also determine the layer dependent magneto-crystalline anisotropy and show that the anisotropy can be tuned easily in the different layers by the external electric field.

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