Actuator and power usage device

(canceled)

A power usage device, comprising:

• a magnetostrictive material forming a beam shape and capable of generating a spin current by curving and/or twisting deformation;
• and
• power usage means having a conductive body provided so as to reciprocate along a length direction of the magnetostrictive material on a surface of the magnetostrictive material so that the spin current flows in and an electric current flows, and configured to use a potential difference generated in the conductive body by the flow-in spin current.

(canceled)

(canceled)

A power usage device comprising:

• a magnetostrictive material (excluding those generating a spin current by phonon-magnon interaction) capable of generating a spin current at deformation by distortion or a volume change;
• and
• power usage means provided so that the spin current flows in and using a potential difference generated by the flow-in spin current.