Recent Advances in Nanocontact Spin-Torque Oscillators
2014 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 50, no 6, 4100107- p.Article in journal (Refereed) Published
We present a comprehensive review of the most recent advances in nanocontact spin torque oscillators (NC-STOs). NC-STOs are highly tunable, with both applied magnetic field and dc, broadband microwave signal generators. As opposed to the nanopillar geometry, where the lateral cross section of the entire device has been confined to a typically <100 nm diameter, in NC-STOs, it is only the current injection site that has been laterally confined on top of an extended magnetic film stack. Three distinct material combinations will be discussed: 1) a Co/Cu/NiFe pseudospin valve (PSV) where both the Co and NiFe have a dominant in-plane anisotropy; 2) a Co/Cu/[Co/Ni](4) orthogonal PSV where the Co/Ni multilayer has a strong perpendicular anisotropy; and 3) a single NiFe layer with asymmetric non-magnetic Cu leads. We explore the rich and diverse magnetodynamic modes that can be generated in these three distinct sample geometries.
Place, publisher, year, edition, pages
2014. Vol. 50, no 6, 4100107- p.
Magnetodynamics, spin waves (SWs), spin-torque oscillator (STO), spin-transfer torque (STT)
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-155812DOI: 10.1109/TMAG.2014.2305762ISI: 000343033900036ScopusID: 2-s2.0-84957893461OAI: oai:DiVA.org:kth-155812DiVA: diva2:763030
1st International Symposium on Frontiers in Materials Science (IS FMS), NOV 17-19, 2013, Hanoi, Vietnam
QC 201411132014-11-132014-11-132014-11-13Bibliographically approved