Spin dynamics in point contacts to single ferromagnetic films
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, no 9, 092419-1-092419-4 p.Article in journal (Refereed) Published
Excitation of magnons or spin waves driven by nominally unpolarized transport currents in point contacts of normal and ferromagnetic metals is probed by irradiating the contacts with microwaves. Two characteristic dynamic effects are observed: a suppression of spin-wave nonlinearities in the point contact conductance by off-resonance microwave irradiation and a resonant stimulation of spin-wave peaks in the differential resistance of the nanocontacts by the microwave field. These observations provide direct evidence that the magnetoresistance peaks observed are due to gigahertz spin dynamics at the ferromagnetic interface driven by the spin transfer torque effect of the transport current.
Place, publisher, year, edition, pages
2009. Vol. 79, no 9, 092419-1-092419-4 p.
cobalt; copper; ferromagnetic materials; magnetic thin films; magnetoresistance; magnons; metallic thin films; nanocontacts; point contacts; radiation effects; spin dynamics; spin polarised transport; spin waves
IdentifiersURN: urn:nbn:se:kth:diva-8680DOI: 10.1103/PhysRevB.79.092419ISI: 000264768200022ScopusID: 2-s2.0-65249178343OAI: oai:DiVA.org:kth-8680DiVA: diva2:14064
QC 20100818. Uppdaterad från manuskript till artikel (20100818).2008-06-042008-06-042010-08-18Bibliographically approved