Theoretical study of localized spin devices with spin-wave-packet propagation to replace electron conduction devices

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We theoretically studied the spin relaxation which suppressed the sustainability of the spin-wave-packet propagation. In particular, we derived an expression of the spin-atomic vibration interaction, VSA, which was an origin of the spin relaxation, and calculated the transition probability due to VSA(i. e., the reciprocal spin relaxation time). Here, the spin-wave-packet corresponds to an excited state, in which a part of spin moment is canted in a crystal with an ordered spin state. In addition, the spin relaxation represents the transition from the excited state to the ground state. As the transition probability due to VSA becomes smaller, the spin-wave-packet has more possibility to propagate