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Impact of the Oersted Field on Droplet Nucleation Boundaries

Journal article
Authors S. Jiang
Seyyed Etesami
S. J. Chung
Q. T. Le
Afshin Houshang
Johan Åkerman
Published in Ieee Magnetics Letters
Volume 9
Pages 4
ISSN 1949-307X
Publication year 2018
Published at Department of Physics (GU)
Pages 4
Language en
Links dx.doi.org/10.1109/lmag.2018.285000...
Keywords Spin electronics, magnetic droplet, Oersted field, spin-torque, nano-oscillators, torque nano-oscillators, spin-waves, magnetic multilayers, magnetoresistance, excitation, solitons, driven
Subject categories Condensed Matter Physics

Abstract

We investigate how the Oersted field affects the magnetic droplet nucleation boundary in spin-torque nano-oscillators based on orthogonal spin-valve stacks with a perpendicular magnetic anisotropy Co/Ni free layer and an easy-plane anisotropy Ni80Fe20 fixed layer. The current-field nucleation boundary is determined experimentally using both microwave signal and dc resistance measurements. The Oersted field can, in principle, have an impact on droplet nucleation. This effect is considered approximately using an analytical equation for the nucleation boundary, which is extended to cover fields larger than the fixed-layer saturation field. We test the accuracy of this approach by comparing with micromagnetic simulations. Finally, we carry out a numerical fit to experimental data and find good agreement.

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