Enhancing spin-transfer torque through the proximity of quantum well states

Theodonis, I; Kalitsov, A; Kioussis, N

dc.contributor.author	Theodonis, I	en
dc.contributor.author	Kalitsov, A	en
dc.contributor.author	Kioussis, N	en
dc.date.accessioned	2014-03-01T01:26:18Z
dc.date.available	2014-03-01T01:26:18Z
dc.date.issued	2007	en
dc.identifier.issn	1098-0121	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17989
dc.subject	Exchange Coupling	en
dc.subject	Magnetic Tunnel Junction	en
dc.subject	Spin Polarization	en
dc.subject	Quantum Well	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	MAGNETIC TUNNEL-JUNCTIONS	en
dc.subject.other	EXCHANGE	en
dc.subject.other	MULTILAYERS	en
dc.subject.other	SYSTEMS	en
dc.title	Enhancing spin-transfer torque through the proximity of quantum well states	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.76.224406	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.76.224406	en
heal.identifier.secondary	224406	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	We predict that the spin-transfer, T-i,T-parallel to, and fieldlike, T-i,T-perpendicular to, components of the local spin torque are dramatically enhanced in double-barrier magnetic tunnel junctions. The spin-mixing enhancement is due to the energetic proximity of majority and minority quantum well states (QWSs) of different quantum numbers within the bias window. The local-spin-torque enhancement is not associated with a corresponding enhancement of the spin-polarized currents. T-i,T-parallel to exhibits a switch-on and switch-off steplike bias behavior when spin-polarized QWSs enter the bias window or exit the energy band, while T-i,T-perpendicular to changes sign between switch-on biases. The net T-perpendicular to exhibits an anomalous angular behavior due to the bias interplay of the bilinear and biquadratic effective exchange couplings.	en
heal.publisher	AMER PHYSICAL SOC	en
heal.journalName	Physical Review B - Condensed Matter and Materials Physics	en
dc.identifier.doi	10.1103/PhysRevB.76.224406	en
dc.identifier.isi	ISI:000251986400044	en
dc.identifier.volume	76	en
dc.identifier.issue	22	en