Power Spintronics

The flow of electron spins, the so-called “spin current”, is a key concept in the recent progress in spintronics. In ferromagnetic metals and semiconductors, the spin current interacts with magnetization by the exchange interaction and induces the motion of the magnetization due to the angular momentum conservation, the so-called spin transfer torque. Its inverse effect is called the spin-motive force which is the electric voltage generated by the magnetization dynamics due to the energy conservation between electrical current and magnetization. The spin motive-force is derived by introducing spin Berry phase in the Faraday’s law of electro-magnetism. Spin current is induced and manipulated by heat and mechanical motion as well. The interconversion between various energies through spin current , the so-called “power spintronics”, will be discussed.

Séminaire organisé dans le cadre du programme interdisciplinaire MAT-PULSE