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Takashi Kimura Last modified date:2020.06.18

Professor / Condensed Matter Physics
Department of Physics
Faculty of Sciences

Graduate School
Undergraduate School
Other Organization

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Academic Degree
Ph. D
Country of degree conferring institution (Overseas)
Field of Specialization
Total Priod of education and research career in the foreign country
Outline Activities
Conduction electrons in ferromagnets are spin polarized because of their spin-dependent conductivity. When an electric field is applied in a ferromagnet, the spin current, which is a flow of spin angular momentum, is generated in addition to the charge current. The spin current normally appears in ferromagnets. However, by using a ferromagnetic/nonmagnetic junction or the spin-orbit interaction, the spin current can be generated also in nonmagnets.

Spin-dependent transport phenomenon such as giant magnetoresistance (GMR) and spin Hall effect transform from the spin current (spin information of conduction electrons) into the charge current (electrical information) and vice versa. Moreover, the injection of the spin current into another ferromagnet transfers the spin angular momentum, resulting in the magnetization reversal of the ferromagnet. Thus, spin currents are very attractive both from a fundamental and a technological point of view. Therefore, the efficient manipulation of spin current is a key ingredient for future spintronic devices.

The spin current is usually superimposed on the charge current. However, the pure spin current, which does not include charge currents, can be generated by extracting only electric charges from the electron flow. We mainly focus on the innovation of novel spintronic devices by using generation, propagation, mixing and detection techniques of the spin currents, which have been established by us. Moreover, we are also interested in novel transport phenomenon related to pure spin currents.
Research Interests
  • Nano spin devices using three-dimensional chargeless spin currents
    keyword : Spintronics, Spin-dependent transport, Spin injection, Spin Hall effect
Academic Activities
Membership in Academic Society
  • Magnetic Society of Japan
  • Japan Physical Society
  • Development of manipulation technique of pure spin currents in metallic nanostructures