Magnetization reversal device, memory element, and magnetic field generation device

摘要

A magnetization reversal device includes a ferromagnetic 12 body which is provided in an interconnection of a non-ferromagnetic dot 11 so that a part or a whole of the ferromagnetic dot is three-dimensionally buried in the interconnection of said non-ferromagnetic dot, and a spin injection source 13 which generates a spin-polarized pure spin current without a flow of charges, and which is provided in the interconnection of the non-ferromagnetic dot 11 to be in contact therewith so that the interconnection of the non-ferromagnetic dot serves as a common electrode, and the pure spin current flows into the ferromagnetic dot 2 through the interconnection of the non-magnetic body by the spin injection source 13 due to a diffusion current, to thereby reverse magnetization of the ferromagnetic dot 12. By injecting the pure spin current, using this planar structure, it is possible to easily carry out the magnetization reversal of the ferromagnetic dot 12 even if it is a thick film ferromagnetic dot without being subjected to limitation of a spin diffusion length.

主权项

1. A magnetization reversal device comprising:
a ferromagnetic dot provided in an interconnection of a non-ferromagnetic dot so that a whole upper surface of said ferromagnetic dot, and a part or a whole of a side surface thereof, a whole lower surface thereof and a part or a whole of the side surface thereof, or a whole surface thereof is three-dimensionally buried in the interconnection of said non-ferromagnetic dot; multi-terminal spin injection means that generates a spin-polarized pure spin current without a flow of charges, and that is provided in the interconnection of said non-ferromagnetic dot to be in contact therewith so that the interconnection of said non-ferromagnetic dot serves as a common electrode; and an electric current source that supplies said spin injection means and said non-ferromagnetic dot with electric currents; characterized by the facts that:
one of said multi-terminal spin injection means is provided at a position except for a current path for a corresponding pure spin current between another spin injection means of said multi-terminal spin injection means and said ferromagnetic dot;a closed circuit is at least formed by said multi-terminal spin injection means, said non-ferromagnetic dot and said electric current source, wherein a diffusion current is generated by energizing said closed circuit with the electric currents; andsaid pure spin current flows into said ferromagnetic dot through the intermediary of the interconnection of said non-magnetic body due to said diffusion current by each of said multi-terminal spin injection means, to thereby reverse magnetization of said ferromagnetic dot.