Spin Physics Theory Research Team

Principal Investigator

PI Name Gen Tatara
Degree D.Sci.
Title Team Leader
Brief Resume
1992Doctor of Science, Department of Physics, Faculty of Science, University of Tokyo
1992Postdoctoral Fellow, The Department of Physics, Faculty of Science, University of Tokyo
1994Postdoctoral Fellow, The Institute of Physical and Chemical Research, RIKEN
1996Assistant Professor, Graduate School of Science, Osaka University
2004PRESTO, Japan Science and Technology Agency
2005Associate Professor, Graduate School of Science and Engineering, Tokyo Metropolitan University
2012Team Leader, Emergent Spintronics Theory Research Team, RIKEN
2013Team Leader, Spin Physics Theory Research Team, Quantum Information Electronics Division, RIKEN Center for Emergent Matter Science (-present)

Outline

Our aim is to explore novel spin-related effects with extremely high efficiency in condensed matters. We thus contributes to development of spintronics, a technology using spin as well as charge of electrons, and to realization of ultrafast and high-density information technology with low energy consumption. Our particular interest is at present in a strong quantum relativistic effect in solids, which is applicable to very strong magnets and efficient conversion of spin information to an electric signal. Our main method is a field theory.

Research Fields

Physics, Engineering, Materials Sciences

Keywords

Spintronics
Spin-orbit interaction
Domain wall
Monopole
Spin current
Metamaterial

Results

Emergent spin electromagnetism induced by magnetization textures in the presence of spin-orbit interaction

Magnetic textures in metallic systems induces emergent electromagnetic fields which couples to electrons’ spin. We have studied the emergent fields induced by spin-orbit interactions and showed that Rashba spin-orbit interaction induces spin electromagnetic field which arises in the linear order in gradient of magnetization texture, in contrast to the conventional spin Berry’s phase contributions. The Rashba-induced effective electric and magnetic fields satisfy in the absence of spin relaxation the Maxwell’s equations as in the charge-based electromagnetism. When spin relaxation is taken into account besides spin dynamics, a monopole current emerges. It induces a novel monopole-driven spin motive force whose origin is different from the conventional motive force induced by the time-dependent spin Berry’s phase. The monopole is expected to play an important role in spin-charge conversion and in the integration of spintronics into electronics.

In ferromagnetic metals, spin of electrons traveling through a magnetization structure follows the local spin and acquires a quantum phase. This phase acts as an effective electromagnetic fields that couples to electron spin.

Members

Gen Tatara

Team Leader gen.tatara[at]riken.jp R

Henri Mikael Saarikoski

Research Scientist

Atsuo Shitade

Special Postdoctoral Researcher

Pablo Borys Sosa

Postdoctoral Researcher

Collins Ashu Akosa

Postdoctoral Researcher

Yuta Yamane

Visiting Researcher

Junji Fujimoto

Research Fellow

Hideo Kawaguchi

Junior Research Associate

Articles

お問い合わせ

2-1 Hirosawa, Wako, Saitama 351-0198 Japan

E-mail:
gen.tatara[at]riken.jp

Links