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Switching of a single atomic spin induced by spin injection: Effect of spin relaxation by Satoshi Kokado; Kikuo Harigaya; Akimasa Sakuma is a Engineering article available to read on EtoBox.

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## Abstract Toward the manipulation of a single atomic spin, we theoretically study the switching of a localized quantum spin induced by spin injection. The system consists of electrode/spin quantum dot/electode junctions, in which the left electrode (right electrode) has conduction electrons with up spin (with down spin), and the dot has the localized quantum spin S = (__S~x~__; __S~y~__; __S~z~__). This S has a uniaxial anisotropic energy, –__|D|S__~__z__~ ^2^, which shows the bistable potential between __S~z~__ = –__S__ and __S__, with __D__ being an anisotropy constant. Furthermore, S interacts with the atomic vibration. For the initial state of __S~z~__ = –__S__, we consider a situation in which up spin electrons exhibit the spin‐flip tunneling from the left electrode to the right one through an exchange interaction between the electron spin and S. We obtain the time dependence of the current, the expectation value of __S~z~__, and that of the vibration quantum number using the master equation approach, in which a parameter related to the spin relaxation time, __τ__, is taken into account. On the basis of recent experimental results about an Fe atom on CuN surface [C. F. Hirji

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Author

Satoshi Kokado; Kikuo Harigaya; Akimasa Sakuma

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 1862-6351)

Published

2009

Language

EN

Field

Engineering (Physical Sciences)