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Current-driven magnetic domain wall (DW) motion has been extensively studied not only theoretically, but also experimentally. The DW motion is induced by spin-transfer torque, that is, the transfer of spin angular momentum from conduction electrons to localized electrons. The velocity of DW motion is proportional to the spin polarization [Pa = (σ↑ − σ↓)/(σ↑ + σ↓)] of electrical conductivity (σ) and...
A micro screw, a micro nut, an outer micro gear, an internal micro gear, a helical micro gear, a micro turbine-impeller and other micro mechanical parts are developed by utilizing extra fine wires. The extra fine wires are metallic wires or synthetic fibers which diameters are as small as 30 to 200 micrometers like a stainless wire, a tungsten wire, a copper wire, and a fluorocarbon thread. The micro...
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