Comptes Rendus
Spin Transfer Torque: a new method to excite or reverse a magnetization
[Le transfert de spin : un nouveau moyen pour exciter ou renverser une aimantation]
Comptes Rendus. Physique, Volume 6 (2005) no. 9, pp. 956-965.

La découverte récente qu'un courant polarisé en spin peut exercer, via un transfert de moment angulaire de spin, un fort couple sur un ferromagnétique offre un nouveau moyen pour manipuler une aimantation sans appliquer de champ externe. Ce couple dit de transfert de spin peut, pour un courant suffisament fort, générer des excitations magnétiques en hyperfréquence ou même provoquer le renversement de l'aimantation. Bien que la nature des modes magnétiques induits par le courant ne soit pas encore bien résolue, le transfert de spin représente d'ores et déjà une rupture en spintronique et fait l'objet de nombreuses recherches pour les applications dans les mémoires magnétiques non volatiles, la logique magnétique ultra-rapide, l'enregistrement haute densité ou encore dans les dispositifs hyperfréquences pour les télécommunications.

The recent discovery that a spin polarized current can exert a large torque on a ferromagnet through a transfer of spin angular momentum, offers a new method to manipulate a magnetization without applying any external field. This additional spin transfer torque can generate oscillatory magnetic modes or even magnetization reversal, for a sufficiently large current. Although the nature of the magnetization dynamics induced by this new effect is not yet completely resolved, spin transfer is already a turning point in spintronics and is today the subject of an extensive research for applications in magnetic random access memory, fast programmable logic, high-density recording and in high frequency devices for telecommunications.

Publié le :
DOI : 10.1016/j.crhy.2005.10.002
Keywords: Spintronics, Spin transfer, Microwave dynamics
Mot clés : Spintronique, Transfert de spin, Dynamique hyperfréquence
Vincent Cros 1 ; Olivier Boulle 1 ; J. Grollier 1 ; Amir Hamzić 1 ; M. Muñoz 1 ; Luis Gustavo Pereira 1 ; Frédéric Petroff 1

1 Unité mixte de physique CNRS/Thales, route départementale 128, 91767 Palaiseau cedex, France et Université Paris-Sud XI, 91405 Orsay cedex, France
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Vincent Cros; Olivier Boulle; J. Grollier; Amir Hamzić; M. Muñoz; Luis Gustavo Pereira; Frédéric Petroff. Spin Transfer Torque: a new method to excite or reverse a magnetization. Comptes Rendus. Physique, Volume 6 (2005) no. 9, pp. 956-965. doi : 10.1016/j.crhy.2005.10.002. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2005.10.002/

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