Continuous tunable lateral magnetic anisotropy in La0.67Ca0.33MnO3/SrRuO3 superlattices by stacking period-modulation
Continuous tunable lateral magnetic anisotropy in La0.67Ca0.33MnO3/SrRuO3 superlattices by stacking period-modulation
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DOI：
10.1063/5.0052109
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发表时间：
2021-07
期刊：
影响因子：
1.6
通讯作者：
Lili Qu;D. Lan;Kexuan Zhang;Enda Hua;B. Ge;Liqiang Xu;F. Jin;Guan-Yin GAO;Lingfei Wang
中科院分区：
文献类型：
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作者：
Lili Qu;D. Lan;Kexuan Zhang;Enda Hua;B. Ge;Liqiang Xu;F. Jin;Guan-Yin GAO;Lingfei Wang
磁各向异性的有效控制对自旋电子器件的发展具有重要意义。在这项工作中，我们进行了一个案例研究的堆叠周期（N）介导的横向磁各向异性的重取向在La0.67Ca0.33MnO3/SrRuO 3超晶格。当N从1增加到15时，磁易轴从正交[010]轴切换到[100]轴。超晶格（SL）（N = 15）的最大各向异性常数达到−1.83 × 105 erg/cm 3。X射线吸收光谱和X射线线性二向色性进一步表明，所观察到的横向磁各向异性的变化是由面内轨道极化驱动的。对于具有小N的SL，各向异性应变诱导轨道极化沿着b轴可以导致[010]取向的磁易轴。对于大N的SL，从二维到三维的维度交叉可以增强Ru t2 g和Mn dx 2 −y2轨道的杂化，这可以与应变效应竞争并将磁易轴切换到[100]。我们的研究结果提出了一个潜在的战略工程磁各向异性，通过应变工程和界面轨道工程的合作。
Effective control of magnetic anisotropy is important for developing spintronic devices. In this work, we performed a case study of stacking periods (N)-mediated reorientation of lateral magnetic anisotropy in ultrathin La0.67Ca0.33MnO3/SrRuO3 superlattices. As N increases from 1 to 15, the magnetic easy-axis switches from the orthorhombic [010] to [100]-axis. The maximum anisotropy constant of the superlattice (SL) (N = 15) reaches −1.83 × 105 erg/cm3. X-ray absorption spectroscopy and x-ray linear dichroism further suggest that the observed changes in lateral magnetic anisotropy are driven by in-plane orbital polarization. For SLs with small N, anisotropic strain-induced orbital polarization along the b-axis can result in the [010]-oriented magnetic easy axis. For SLs with large N, the dimension crossover from 2-dimension to 3-dimension could enhance the hybridization of Ru t2g and Mn dx2−y2 orbitals, which can compete with the strain effect and switch the magnetic easy axis to [100]. Our results suggest a potential strategy for engineering magnetic anisotropy through the cooperation of strain engineering and interfacial orbital engineering.