title: Electric-field control of magnetic moment in Pd.
abstract: Several magnetic properties have recently become tunable with an applied electric field. Particularly, electrically controlled magnetic phase transitions and/or magnetic moments have attracted attention because they are the most fundamental parameters in ferromagnetic materials. In this study, we showed that an electric field can be used to control the magnetic moment in films made of Pd, usually a non-magnetic element. Pd ultra-thin films were deposited on ferromagnetic Pt/Co layers. In the Pd layer, a ferromagnetically ordered magnetic moment was induced by the ferromagnetic proximity effect. By applying an electric field to the ferromagnetic surface of this Pd layer, a clear change was observed in the magnetic moment, which was measured directly using a superconducting quantum interference device magnetometer. The results indicate that magnetic moments extrinsically induced in non-magnetic elements by the proximity effect, as well as an intrinsically induced magnetic moments in ferromagnetic elements, as reported previously, are electrically tunable. The results of this study suggest a new avenue for answering the fundamental question of "can an electric field make naturally non-magnetic materials ferromagnetic?".
authors.affiliation: Department of Applied Physics, Faculty of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.
authors.forename: Aya
authors.initials: A
authors.lastname: Obinata
authors.affiliation: Department of Applied Physics, Faculty of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Hibino
authors.affiliation: Department of Applied Physics, Faculty of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.
authors.forename: Daichi
authors.initials: D
authors.lastname: Hayakawa
authors.affiliation: Department of Applied Physics, Faculty of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Koyama
authors.affiliation: Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan.
authors.forename: Kazumoto
authors.initials: K
authors.lastname: Miwa
authors.affiliation: Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan.
authors.forename: Shimpei
authors.initials: S
authors.lastname: Ono
authors.affiliation: Department of Applied Physics, Faculty of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.
authors.forename: Daichi
authors.initials: D
authors.lastname: Chiba