Quantum Nano-Scale Magnetics Team
Team Leader
Yoshichika OTANI (D.Sci.)
Nano-scale magnets can have, according to their shape and size, ordered domain structures such as magnetic vortices and single-domains. Using experimental and theoretical approaches, we study static and dynamical magnetic properties of nano-scale magnets, to obtain a better understanding of the quantum behavior associated with domain wall displacement and magnetization reversal. Moreover, we employ spin-injection and spin-generation techniques using nano-scale magnets which provide spin-polarized currents and non-magnets with high spin-orbit interactions. Our newly launched research projects include domain walls driven by asymmetric potential ratchet, control of pure spin currents, and development of highly-polarized spin sources. The above mentioned spin-injection techniques and spin-injection induced magnetism will be applied to the development of novel spintronic devices.
- Study on the static and dynamic magnetic properties of nano-scale magnets
- Study on the spin-injection induced magnetization reversal and magnetic phase transition
- Study on the basic properties of nano-spintronic devices using potential ratchets
- Development of highly-polarized spin sources
- Study on the properties and generation techniques of spin currents
- April 12, 2007
- Quantum Nano Scale Magnetics Laboratory of FRS succeeded in the world's first electric detection of the spin Hall effect, the phenomenon in which an external electric field induces a transverse spin current.
- February 13, 2009
- Spin currents: pure and clean
Switching the orientation of magnetization in a thin metallic film can be achieved using the diffusion of electron spins
- Fukuma Y., Wang L., Idzuchi H. and Otani Y.:
"Enhanced spin accumulation obtained by inserting low-resistance MgO interface in metallic lateral spin valves"
Appl. Phys. Lett. 97, 012507-1~3 (2010) - Ohnishi K. , Kimura T., and Otani Y.:
"Nonlocal injection of spin current into a superconducting Nb wire"
Appl. Phys. Lett. 96, 192509-1~3 (2010) - Barman A., Barman S., Kimura T., Fukuma Y., and Otani Y.:
"Gyration mode splitting in magnetostatically coupled magnetic vortices in an array"
J. Phys. D: Appl. Phys. 43, 422001-1~6 (2010) - Yang T., Kimura T., and Y. Otani.:
"Giant spin-accumulation signal and pure spin-current-induced reversible magnetization switching"
Nature Physics 4, 851~4 (2008) - Kimura T., Sato T., and Otani Y.:
"Temperature evolution of spin relaxation in NiFe/Cu lateral spin valve"
Phys. Rev. Lett. 100, 066602-1~4 (2008) - Kimura T., and Otani Y.:
"Large spin accumulation in a Permalloy/Silver lateral spin valve"
Phys. Rev. Lett. 99, 196604-1~4 (2007) - Vila L., Kimura T., and Otani Y.:
"Evolution of the spin Hall effect in Pt nanowires: Size and temperature effects"
Phys. Rev. Lett. 99, 226604-1~4 (2007) - Kimura T., Otani Y.C., and Levy P.M.:
"Electrical control of the direction of spin accumulation"
Phys. Rev. Lett. 99, 166601-1~4 (2007) - Kimura T., Otani Y., Sato T., Takahashi S., and Maekawa S:
"Room temperature reversible spin Hall effect"
Phys. Rev. Lett. 98, 156601-1~4 (2007) - Kimura T., Otani Y., and Hamrle J.:
"Switching magnetization of nanoscale ferromagnetic particle using nonlocal spin injection"
Phys. Rev. Lett. 96, 037201-1~4 (2006)