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Article: Zero-field precession and hysteretic threshold currents in a spin torque nano device with tilted polarizer

TitleZero-field precession and hysteretic threshold currents in a spin torque nano device with tilted polarizer
Authors
Issue Date2009
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/EJ/journal/NJP
Citation
New Journal Of Physics, 2009, v. 11 How to Cite?
AbstractUsing nonlinear system theory and numerical simulations, we map out the static and dynamic phase diagrams in the zero applied field of a spin torque nano device with a tilted polarizer (TP). We find that for sufficiently large currents, even very small tilt angles (β > 1°) will lead to steady free layer precession in zero field. Within a rather large range of tilt angles, 1° < β < 19°, we find coexisting static states and hysteretic switching between these using only current. In a more narrow window (1° < β < 5°) one of the static states turns into a limit cycle (precession). The coexistence of current-driven static and dynamic states in the zero magnetic field is unique to the TP device and leads to large hysteresis in the upper and lower threshold currents for its operation. The nano device with TP can facilitate the generation of large amplitude mode of spin torque signals without the need for cumbersome magnetic field sources and thus should be very important for future telecommunication applications based on spin transfer torque effects. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Persistent Identifierhttp://hdl.handle.net/10722/159782
ISSN
2015 Impact Factor: 3.57
2015 SCImago Journal Rankings: 1.902
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, Yen_HK
dc.contributor.authorBonetti, Sen_HK
dc.contributor.authorZha, CLen_HK
dc.contributor.authorÅkerman, Jen_HK
dc.date.accessioned2012-08-16T05:56:35Z-
dc.date.available2012-08-16T05:56:35Z-
dc.date.issued2009en_HK
dc.identifier.citationNew Journal Of Physics, 2009, v. 11en_HK
dc.identifier.issn1367-2630en_HK
dc.identifier.urihttp://hdl.handle.net/10722/159782-
dc.description.abstractUsing nonlinear system theory and numerical simulations, we map out the static and dynamic phase diagrams in the zero applied field of a spin torque nano device with a tilted polarizer (TP). We find that for sufficiently large currents, even very small tilt angles (β > 1°) will lead to steady free layer precession in zero field. Within a rather large range of tilt angles, 1° < β < 19°, we find coexisting static states and hysteretic switching between these using only current. In a more narrow window (1° < β < 5°) one of the static states turns into a limit cycle (precession). The coexistence of current-driven static and dynamic states in the zero magnetic field is unique to the TP device and leads to large hysteresis in the upper and lower threshold currents for its operation. The nano device with TP can facilitate the generation of large amplitude mode of spin torque signals without the need for cumbersome magnetic field sources and thus should be very important for future telecommunication applications based on spin transfer torque effects. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.en_HK
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/EJ/journal/NJPen_HK
dc.relation.ispartofNew Journal of Physicsen_HK
dc.titleZero-field precession and hysteretic threshold currents in a spin torque nano device with tilted polarizeren_HK
dc.typeArticleen_HK
dc.identifier.emailZhou, Y: yanzhou@hku.hken_HK
dc.identifier.authorityZhou, Y=rp01541en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1088/1367-2630/11/10/103028en_HK
dc.identifier.scopuseid_2-s2.0-72149086095en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-72149086095&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume11en_HK
dc.identifier.eissn1367-2630-
dc.identifier.isiWOS:000271033600002-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhou, Y=51360911500en_HK
dc.identifier.scopusauthoridBonetti, S=23972463400en_HK
dc.identifier.scopusauthoridZha, CL=12645295100en_HK
dc.identifier.scopusauthoridÅkerman, J=7003585708en_HK

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