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Analytical description of ballistic spin currents and torques in magnetic tunnel junctionsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 ноября 2015 г.
- Авторы: Chshiev M., Manchon A., Kalitsov A., Ryzhanova N., Vedyayev A., Strelkov N., Butler W.H., Dieny B.
- Журнал: Physical Review B
- Том: 92
- Номер: 10
- Год издания: 2015
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 104422
- DOI: 10.1103/PhysRevB.92.104422
- Аннотация: In this work we demonstrate explicit analytical expressions for both charge and spin currents which constitute the 2×2 spinor in magnetic tunnel junctions with noncollinear magnetizations under applied voltage. The calculations have been performed within the free electron model in the framework of the Keldysh formalism and WKB approximation. We demonstrate that spin/charge currents and spin transfer torques are all explicitly expressed through only three irreducible quantities, without further approximations. The conditions and mechanisms of deviation from the conventional sine angular dependence of both spin currents and torques are shown and discussed. It is shown in the thick barrier approximation that all tunneling transport quantities can be expressed in an extremely simplified form via Slonczewski spin polarizations and our effective spin averaged interfacial transmission probabilities and effective out-of-plane polarizations at both interfaces. It is proven that the latter plays a key role in the emergence of perpendicular spin torque as well as in the angular dependence character of all spin and charge transport considered. It is demonstrated directly also that for any applied voltage, the parallel component of spin current at the FM/I interface is expressed via collinear longitudinal spin current components. Finally, spin transfer torque behavior is analyzed in a view of transverse characteristic length scales for spin transport.
- Добавил в систему: Стрелков Никита Викторович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | PhysRevB.92.104422.pdf | 549,3 КБ | 22 сентября 2015 [nik] |