2021 年 64 巻 5 号 p. 230-235
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.