Centers & Labs

RIKEN Center for Emergent Matter Science

Quantum Nano-Scale Magnetism Research Team

Team Leader: Yoshichika Otani (D.Sci.)
Yoshichika  Otani(D.Sci.)

At the surface of heavy elements and the interface of heterogeneous materials, the spin band splitting originates from the strong spin-orbit interaction. By exploiting such specific interfacial properties for spintronics, it is expected to realize ultra-thin and ultra-low power consumption devices. We investigate the generation of "spin current" that carries no electric charges but only spin angular momentum by applying the charge current at the interface. So that the spin current injection into nanoscale magnetic materials enables us to efficiently control the magnetic domain wall motion and magnon propagation. We aim at studying to develop new types of spintronic devices by using the techniques of spin current generation and injection.

Main Research Field

Physics

Related Research Fields

Engineering / Materials Sciences

Research Subjects

  • Study on the charge-to-spin interconversion at heterogeneous material interfaces
  • Study on the spin-injection induced magnetization reversal and magnetic phase transition
  • Study on the spinwave logic circuit
  • Study on the interaction between spin currents and superconductivity
  • Study on the spin injection into organic materials and control of the properties

Selected Publications

  1. H. Idzuchi, Y. Fukuma and Y. Otani.:
    "Spin transport in non-magnetic nano-structures induced by non-local spin injection"
    Physica E 68, 239~263 (2015).
  2. O. Rousseau, M. Yamada, K. Miura, S. Ogawa and Y. Otani.:
    "Propagation of nonlinearly generated harmonic spin waves in microscopic stripes"
    J. Appl. Phys. 115, 053914-1~5 (2014).
  3. Y. Niimi, H. Suzuki, Y. Kawanishi, Y. Omori, T. Valet, A. Fert and Y. Otani.:
    "Extrinsic spin Hall effects measured with lateral spin valve structures"
    Phys. Rev. B 89, 054401-1~10 (2014).
  4. T. Wakamura, N. Hasegawa, K. Ohnishi, Y. Niimi and Y. Otani.:
    "Spin injection into a superconductor with strong spin-orbit coupling"
    Phys. Rev. Lett. 112, 036602-1~5 (2014).
  5. K. Fujiwara, Y. Fukuma, J. Matsuno, H. Idzuchi, Y. Niimi, Y. Otani and H. Takagi.:
    "5d iridium oxide as a material for spin-current detection"
    Nature Commun. 4, 2893-1~6 (2013).
  6. H. Idzuchi, S. Karube, Y. Fukuma, T. Aoki and Y. Otani.:
    "Impact of interface properties on spin accumulation in dual-injection lateral spin valves"
    Appl. Phys. Lett. 103, 162403-1~4 (2013).
  7. B. K. Mahato, B. Rana, R. Mandal, D. Kumar, S. Barman, Y. Fukuma, Y. Otani and A. Barman.:
    "Configurational anisotropic spin waves in cross-shaped Ni80Fe20 nanoelements"
    Appl. Phys. Lett. 102, 192402-1~4 (2013).
  8. Y. Niimi, D. H. Wei, H. Idzuchi, T. Wakamura, T. Kato and Y. Otani.:
    "Experimental verification of comparability between spin-orbit and spin-diffusion lengths"
    Phys. Rev. Lett. 110, 016805-1~5 (2013).
  9. Y. Niimi, Y. Kawanishi, D. H. Wei, C. Deranlot, H. X. Yang, M. Chshiev, T. Valet, A. Fert and Y. Otani.:
    "Giant spin Hall effect induced by skew scattering from Bismuth impurities inside thin film CuBi alloys"
    Phys. Rev. Lett. 109, 156602-1~5 (2012).
  10. D. H. Wei, Y. Niimi, B. Gu, T. Ziman, S. Maekawa and Y. Otani.:
    "The spin Hall effect as a probe of nonlinear spin fluctuations"
    Nature Commun. 3, 1058-1~5 (2012).

Lab Members

Principal Investigator

Yoshichika Otani
Team Leader

Core Members

Bivas Rana
Postdoctoral Researcher
Kouta Kondou
Research Scientist
Junyeon Kim
Postdoctoral Researcher
Jorge Luis Puebla Nunez
Postdoctoral Researcher
Shutaro Karube
Student Trainee
Norinobu Hasegawa
Student Trainee

Contact information

317, Main Research Building, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Email: yotani [at] riken.jp

Related links

Recent research results

December 11, 2015: RIKEN RESEARCH
Metal−oxide interfaces create a flipping point