Magnetic anisotropy of (100)- and (110)-oriented epitaxial CrO2 films grown on SnO2- the effects of strain and interface
Magnetic anisotropy of (100)- and (110)-oriented epitaxial CrO2 films grown on SnO2- the effects of strain and interface
复制标题
SnO2 上生长的 (100) 和 (110) 取向外延 CrO2 薄膜的磁各向异性 - 应变和界面的影响
DOI：
10.1016/j.ceramint.2017.07.178
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发表时间：
2017
影响因子：
5.2
通讯作者：
Shi Jing
中科院分区：
文献类型：
--
作者：
Liu Shuo;Lu Zhihong;Zhang Zhenhua;Cheng Ming;Liu Yong;Yu Ziyang;Li Weiwei;Xiong Rui;Shi Jing
研究了在SnO2上生长的不同取向和厚度的CrO2薄膜的晶体结构和磁性，并与在TiO2上生长的CrO2薄膜进行了比较。结果表明，在（100）膜中存在大的各向异性应变，而在（110）膜中仅存在小的各向异性应变。在SnO_2和TiO_2上制备的CrO_2（110）薄膜的磁各向异性相似。对于CrO2（100）薄膜，其磁各向异性差异较大，在相同厚度下，SnO2衬底上的CrO2（100）薄膜的磁各向异性大于TiO2衬底上的CrO2（100）薄膜。然而，薄膜的易轴被发现总是沿caxis，即使在非常小的厚度，并没有观察到易轴切换。第一性原理计算表明，磁各向异性能不仅与各向异性应变有关，而且与衬底有关。界面的各向异性偏好和应变效应之间的竞争可能是决定实际易轴方向的一个重要因素。应变和界面的综合作用也可能是导致SnO2和TiO2上CrO2（100）薄膜磁各向异性差异的原因之一。
The crystal structures and magnetic properties of CrO2films of different orientations and thicknesses grown on SnO2were investigated and compared with those on TiO2. Results reveal that large anisotropic strains were found in (100) films, but only small strains existed in (110) films. The magnetic anisotropies of CrO2(110) films on SnO2and TiO2were found to be similar. As for CrO2(100) films, magnetic anisotropies were quite different-at the same thickness, the magnetic anisotropy of the film on SnO2substrate was higher than that on TiO2. However, the easy axes of the films were found to be always alongcaxis even at very small thickness, and no easy axis switching was observed. First-principle calculations reveal that magnetic anisotropy energy is not only concerned with anisotropic strain but also with the substrate. The competition between the anisotropic preference of interface and the effect of strains may be one important factor for determining the actual easy axis direction. The combined effects of strain and interface may also be one reason for the magnetic anisotropic difference between CrO2(100) films on SnO2and TiO2.