Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators
2014 (English)In: Physica. B, Condensed matter, ISSN 0921-4526, Vol. 435, 84-87 p.Article in journal (Refereed) Published
We study microwave signal generation as a function of drive current and applied perpendicular magnetic field in nano-contact spin torque oscillators (NC-STOs) based on orthogonal (pseudo) spin valves where the Co fixed layer has strong easy-plane anisotropy, and the [Co/Ni] free layer has a strong perpendicular magnetic anisotropy. The orthogonal NC-STOs exhibit a dramatic transition from the conventional ferromagnetic resonance-like spinwave mode to a magnetic droplet soliton mode. In particular, the field and current dependence of the droplet soliton near threshold are discussed. Near threshold the droplet soliton undergoes complex dynamics that include mode hopping, as evident in the experimental frequency domain and magnetoresistance response.
Place, publisher, year, edition, pages
2014. Vol. 435, 84-87 p.
Magnetoresistance, Spin wave, magnetic droplet soliton, perpendicular magnetic anisotropy, spin torque oscillators
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-217992DOI: 10.1016/j.physb.2013.10.023OAI: oai:DiVA.org:uu-217992DiVA: diva2:694492
9th International Symposium on Hysteresis Modeling and Micromagnetics (HMM 2013)