Theory for a Dissipative Droplet Soliton Excited by a Spin Torque Nanocontact

Published

August 30, 2010

Author(s)

Mark Hoefer, Thomas J. Silva, Mark W. Keller

Abstract

A distinct type of solitary wave is predicted to form in spin torque oscillators when the free layer has a sufficiently large perpendicular anisotropy. In this structure, which is a dissipative version of the conservative droplet soliton originally studied in 1977 by Ivanov and Kosevich, spin torque counteracts the damping that would otherwise destroy the mode. Asymptotic methods are used to derive conditions on perpendicular anisotropy strength and applied current under which a dissipative droplet can be nucleated and sustained. Numerical methods are used to confirm the stability of the droplet against various perturbations that are likely in experiments, including tilting of the applied field, nonzero spin torque asymmetry, and nontrivial Oersted fields. Under certain conditions, the droplet experiences a drift instability in which it propagates away from the nanocontact and is then destroyed by damping.

Citation

Physical Review B

Volume

82

Pub Type

Journals

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Keywords

soliton, spin torque

Citation

Hoefer, M. , Silva, T. and Keller, M. (2010), Theory for a Dissipative Droplet Soliton Excited by a Spin Torque Nanocontact, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905924 (Accessed November 22, 2024)