Hydrogen-mediated control of magnetic anisotropy and magnetic domain structure in Co/Pd multilayer

This study demonstrates the reversible transition from perpendicular to in-plane magnetic anisotropy in Co/Pd multilayers induced by hydrogenation, using a magneto-optic Kerr microscope. By controlling hydrogen pressure and exposure time, the transition is separated into coercivity and squareness ratio changes, reflecting reduced perpendicular anisotropy and spin reorientation. The Dzyaloshinskii-Moriya interaction is observed through asymmetric magnetic domain expansion, with hydrogenation causing domains to fragment. These results suggest hydrogenation as a method for precise control of magnetic anisotropy and domain structures.