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Shear-strain-mediated magnetoelectric effects revealed by imaging.
Nature Materials ( IF 37.2 ) Pub Date : 2019-05-20 , DOI: 10.1038/s41563-019-0374-8 M Ghidini 1, 2, 3 , R Mansell 4 , F Maccherozzi 2 , X Moya 3 , L C Phillips 3 , W Yan 3 , D Pesquera 3 , C H W Barnes 4 , R P Cowburn 4 , J-M Hu 5 , S S Dhesi 2 , N D Mathur 3
Nature Materials ( IF 37.2 ) Pub Date : 2019-05-20 , DOI: 10.1038/s41563-019-0374-8 M Ghidini 1, 2, 3 , R Mansell 4 , F Maccherozzi 2 , X Moya 3 , L C Phillips 3 , W Yan 3 , D Pesquera 3 , C H W Barnes 4 , R P Cowburn 4 , J-M Hu 5 , S S Dhesi 2 , N D Mathur 3
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Large changes in the magnetization of ferromagnetic films can be electrically driven by non-180° ferroelectric domain switching in underlying substrates, but the shear components of the strains that mediate these magnetoelectric effects have not been considered so far. Here we reveal the presence of these shear strains in a polycrystalline film of Ni on a 0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 substrate in the pseudo-cubic (011)pc orientation. Although vibrating sample magnetometry records giant magnetoelectric effects that are consistent with the hitherto expected 90° rotations of a global magnetic easy axis, high-resolution vector maps of magnetization (constructed from photoemission electron microscopy data, with contrast from X-ray magnetic circular dichroism) reveal that the local magnetization typically rotates through smaller angles of 62-84°. This shortfall with respect to 90° is a consequence of the shear strain associated with ferroelectric domain switching. The non-orthogonality represents both a challenge and an opportunity for the development and miniaturization of magnetoelectric devices.
中文翻译：
成像揭示了剪切应变介导的磁电效应。
铁磁性薄膜的磁化强度的巨大变化可以通过下层基板中的非180°铁电畴转换来驱动，但是到目前为止，尚未考虑介导这些磁电效应的应变的剪切分量。在这里，我们揭示了这些剪切应变在伪立方（011）pc取向的0.68Pb（Mg1 / 3Nb2 / 3）O3-0.32PbTiO3衬底上的Ni多晶膜中的存在。尽管振动样品的磁力测定法记录了巨大的磁电效应，与迄今预期的全球磁易轴的90°旋转一致，但是高分辨率的磁化矢量图（由光发射电子显微镜数据构成，与X射线磁性圆二色性形成对比）揭示了局部磁化强度通常会旋转62-84°的较小角度。相对于90°的这种不足是与铁电畴转换相关的剪切应变的结果。非正交性对于磁电器件的发展和小型化既是挑战，又是机遇。
更新日期：2019-05-21
中文翻译：
成像揭示了剪切应变介导的磁电效应。
铁磁性薄膜的磁化强度的巨大变化可以通过下层基板中的非180°铁电畴转换来驱动，但是到目前为止，尚未考虑介导这些磁电效应的应变的剪切分量。在这里，我们揭示了这些剪切应变在伪立方（011）pc取向的0.68Pb（Mg1 / 3Nb2 / 3）O3-0.32PbTiO3衬底上的Ni多晶膜中的存在。尽管振动样品的磁力测定法记录了巨大的磁电效应，与迄今预期的全球磁易轴的90°旋转一致，但是高分辨率的磁化矢量图（由光发射电子显微镜数据构成，与X射线磁性圆二色性形成对比）揭示了局部磁化强度通常会旋转62-84°的较小角度。相对于90°的这种不足是与铁电畴转换相关的剪切应变的结果。非正交性对于磁电器件的发展和小型化既是挑战，又是机遇。
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