ひずみによる垂直磁気異方性の操作：電場印加時のX線磁気円二色性による軌道弾性効果の実証

抄録

Controlling magnetic anisotropy by orbital magnetic moments related to interfacial strains has considerable potential for the development of future devices using spins and orbitals. In this study, we developed an electric-field (E)-induced X-ray magnetic circular dichroism (XMCD) technique to apply E to a ferroelectric BaTiO₃ substrate. We reversibly tuned the interfacial lattice constants of Ni/Cu multilayers on BaTiO₃ using this technique. The strained Ni layer that induces the perpendicular magnetic anisotropy without E is released at E＝8 kV/cm, and in-plane magnetization also occurs. We observed that electric-field-induced XMCD measurements clarified the origin of the reversible changes in perpendicular magnetic anisotropy and established the relationship between macroscopic inverse magneto-striction effects and microscopic orbital magnetic moment anisotropy.