ISSP - The institute for Solid State Physics

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Otani Group
Professor
OTANI,
Yoshichika

Research Associate
ISSHIKI,
Hironari

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At the end of the 20th century, the concept of spin current, a flow of spin angular momentum, appeared. Since then, spintronics has been developing as a scientific framework that connects and effectively uses electric and spin currents. Spintronics research has entered a new stage with the establishment of the spin current generation, transport, and detection methods over the past decade. As a result, it has become clear that quasiparticles such as electron, phonon, photon, and magnon are interconverted via spins in the solid. These "spin conversion" often occur in a nanoscale region near relatively simple hetero-interfaces and thus have extremely excellent versatility and applicability. In our laboratory, we are working on the development and elucidation of a novel spin conversion mechanism from the viewpoint of nano-magnetism. Furthermore, we are conducting research and development of spintronics devices utilizing the newly developed spin conversion by making full use of nanofabrication technology.

Magnetic spin Hall effect in a non-collinear antiferromagnet: discovery of a magnetic contribution to the spin Hall effect. (a) Schematic of the spin-accumulation device: Ferromagnetic and non-magnetic electrodes are formed on top of a microfabricated Mn3Sn. (b) The spin-accumulation signal caused by the magnetic inverse spin Hall effect. Opposite signs of the hysteresis appear after reversing the spins of Mn3Sn. The corresponding spin structures of Mn3Sn are shown in the insets.
The spin-charge current conversion at the molecule/metal interface observed by employing the spin pumping method. (a) The schematics of the PbPc/Cu interface and the spin pumping measurement. (b) Spin pumping induced voltage signal originated in the spin-charge current conversion. (c) Scanning tunneling microscopy image of a single layer PbPc film on Cu(111).

Research Subjects

  1. Development of novel mechanisms of pure spin current generation and detection
  2. Elucidation of the mechanism of the magnetic spin Hall effect and development of functionality
  3. Development of novel spin-to-charge current conversion mechanism
  4. Molecular spintronics
  5. Efficient pure spin current generation by magnon-phonon coupling