Kumar Deepak, David Adrian, Fouchet Arnaud, Pautrat Alain, Boullay Philippe, Jung Chang Uk, Prellier Wilfrid
Normandie Université, UNICAEN, ENSICAEN, Laboratoire CRISMAT, CNRS UMR 6508, Caen Cedex 4 F-14050, France.
Department of Physics, Oxide Research Center, Hankuk University of Foreign Studies, Yongin, Gyeonggi 17035, Korea.
ACS Appl Mater Interfaces. 2020 Aug 5;12(31):35606-35613. doi: 10.1021/acsami.0c07794. Epub 2020 Jul 27.
We have probed the structural and magnetic properties of PrVO (PVO) thin films grown on the (001)-, (110)-, and (111)-oriented SrTiO (STO) substrates. By changing the substrate orientation, the film out-of-plane orientation can be tuned to [110], [100]/[010], and [011]/[311], with different in-plane crystallographic variants. Accommodation of these variants on the different substrates implies different strain states, which have direct influence on the magnetic properties of PVO films. The magnetic moment of PVO films radically enhances from 0.4 μ/f.u. for STO(001) to 2.3 μ/f.u. for STO(111). While films on the (001)-oriented STO substrate display out-of-plane anisotropy, an in-plane anisotropy is observed for films grown on the (110)- and (111)-oriented STO substrates. In addition, a strong uniaxial magnetic anisotropy is also extracted for a partially relaxed film on the (110)-oriented STO substrate. Such findings can help oxide community for the better understanding of magnetic anisotropy in vanadate thin films, a subject that still suffer from significant lack of scientific investigations.
我们研究了在（001）、（110）和（111）取向的SrTiO（STO）衬底上生长的PrVO（PVO）薄膜的结构和磁性。通过改变衬底取向，可以将薄膜的面外取向调整为[110]、[100]/[010]和[011]/[311]，且具有不同的面内晶体学变体。这些变体在不同衬底上的排列意味着不同的应变状态，这对PVO薄膜的磁性有直接影响。PVO薄膜的磁矩从STO（001）时的0.4 μ/f.u.急剧增加到STO（111）时的2.3 μ/f.u.。虽然在（001）取向的STO衬底上的薄膜表现出面外各向异性，但在（110）和（111）取向的STO衬底上生长的薄膜观察到面内各向异性。此外，对于在（110）取向的STO衬底上的部分弛豫薄膜，还提取到了很强的单轴磁各向异性。这些发现有助于氧化物领域更好地理解钒酸盐薄膜中的磁各向异性，这一主题仍严重缺乏科学研究。
