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Controlling magnetic anisotropy by orbital magnetic moments related tointerfacial strains has considerable potential for the development of futuredevices using spins and orbitals. For the fundamental physics, the relationshipbetween strain and orbital magnetic moment is still unknown, because there arefew tools to probe changes of orbital magnetic moment. In this study, wedeveloped an electric-field- (E)-induced X-ray magnetic circular dichroism(EXMCD) technique to apply E to a ferroelectric BaTiO3 substrate. We reversiblytuned the interfacial lattice constants of Ni/Cu multilayers on BaTiO3 usingthis technique. As the domain structures in BaTiO3 are modulated by E, EXMCDmeasurements reveal that the changes in the magnetic anisotropy of Ni/Cu filmsare induced through the modulation of orbital magnetic moments in Ni withmagneto-elastic contributions. The strained Ni layer that induces theperpendicular magnetic anisotropy without E is released at E = 8 kV/cm, andin-plane magnetization also occurs. We observed that EXMCD measurementsclarified the origin of the reversible changes in perpendicular magneticanisotropy and established the relationship between macroscopic inversemagnetostriction effects and microscopic orbital moment anisotropy.

Strain-Induced Reversible Manipulation of Orbital Magnetic Moments in Ni/Cu Multilayers on Ferroelectric BaTiO3