Shutaro Karube 교수

The spin-splitter effect is theoretically predicted to generate an unconventional spin current with x- and z- spin polarization via the spin-split band in antiferromagnets. The generated torque, namely, spin-splitter torque, is effective for the manipulation of magnetization in an adjacent magnetic layer without an external magnetic field for spintronic devices such as MRAM. Here, we study the generation of torque in collinear antiferromagnetic RuO_{2} with (100), (101), and (001) crystal planes

Spin-orbit (SO) field generated via spin Hall effect (SHE) or Rashba-Edelstein effect (REE) is one of the most important topics in spintronics for both fundamental physics and practical applications. Therefore a lot of SO materials such as heavy metals or topological insulators have been intensively studied so far for high conversion efficiency or functionality. But the SO torque efficiency is a material specific value in any case. It is ideal for us to synthesize the SO materials which have var

Abstract Magnetization dynamics in a synthetic antiferromagnet with an adjacent Pt layer are investigated. Using dc bias, magnetic damping can be effectively controlled by the spin–orbit torque from the Pt layer. In the spin-flop state, the acoustic mode is modulated by the dc bias, but the optical mode is not sufficiently modulated. In the saturation state, the optical mode is effectively modulated. By appropriately selecting acoustic and optical modes and magnetization states such as the spin-

Abstract Amid antiferromagnetic spintronics, various interesting spin physics and the usefulness of the antiferromagnets have been explored and they have been proven to be a new functional material in spintronic applications. While various experimental investigations on antiferromagnetic materials are still ongoing, there is always a question of how the magnetic domains look in antiferromagnets. In this work, we propose and demonstrate a spatial imaging technique for antiferromagnetic domains by