Spin Transfer Torque: a new method to excite or reverse a magnetization

Vincent Cros; Olivier Boulle; J. Grollier; Amir Hamzić; M. Muñoz; Luis Gustavo Pereira; Frédéric Petroff

doi:10.1016/j.crhy.2005.10.002

Spin Transfer Torque: a new method to excite or reverse a magnetization

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

Comptes Rendus. Physique, Spintronics, Volume 6 (2005) no. 9, pp. 956-965.

Abstract
Résumé

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.

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.

Published online: 2005-11-01

DOI: 10.1016/j.crhy.2005.10.002

Keywords: Spintronics, Spin transfer, Microwave dynamics
Mots-clés : Spintronique, Transfert de spin, Dynamique hyperfréquence

Author's affiliations:

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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     author = {Vincent Cros and Olivier Boulle and J. Grollier and Amir Hamzi\'c and M. Mu\~noz and Luis Gustavo Pereira and Fr\'ed\'eric Petroff},
     title = {Spin {Transfer} {Torque:} a new method to excite or reverse a magnetization},
     journal = {Comptes Rendus. Physique},
     pages = {956--965},
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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, Spintronics, 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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