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Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators

Journal article
Authors S. M. Mohseni
S. R. Sani
Randy K. Dumas
J. Persson
T. N. Anh Nguyen
Sunjae Chung
Yevgen Pogoryelov
Pranaba Muduli Kishor
Ezio Iacocca
A. Eklund
Johan Åkerman
Published in Physica. B, Condensed matter
Volume 435
Pages 84-87
ISSN 0921-4526
Publication year 2014
Published at Department of Physics (GU)
Pages 84-87
Language en
Links dx.doi.org/10.1016/j.physb.2013.10....
Keywords Magnetic droplet soliton, Magnetoresistance, Perpendicular magnetic anisotropy, Spin torque oscillators, Spin wave
Subject categories Condensed Matter Physics

Abstract

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 spin wave 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. © 2013 Elsevier B.V.

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