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Spin transfer torque generated magnetic droplet solitons (invited)

Journal article
Authors Sunjae Chung
S. M. Mohseni
S. R. Sani
Ezio Iacocca
Randy K. Dumas
T. N. A. Nguyen
Yevgen Pogoryelov
Pranaba Muduli Kishor
A. Eklund
M. Hoefer
Johan Åkerman
Published in Journal of Applied Physics
Volume 115
Issue 17
Pages artikel nr 172612
ISSN 0021-8979
Publication year 2014
Published at Department of Physics (GU)
Pages artikel nr 172612
Language en
Links dx.doi.org/10.1063/1.4870696
Keywords POLARIZED CURRENT, NANO-OSCILLATORS, ELECTRIC-CURRENT, PHASE-LOCKING, DRIVEN, MODULATION, MULTILAYER, EXCITATION, DEVICES, EMISSION, Physics, Applied, PHYSICS, APPLIED
Subject categories Physical Sciences

Abstract

We present recent experimental and numerical advancements in the understanding of spin transfer torque generated magnetic droplet solitons. The experimental work focuses on nano-contact spin torque oscillators (NC-STOs) based on orthogonal (pseudo) spin valves where the Co fixed layer has an easy-plane anisotropy, and the [Co/Ni] free layer has a strong perpendicular magnetic anisotropy. The NC-STO resistance and microwave signal generation are measured simultaneously as a function of drive current and applied perpendicular magnetic field. Both exhibit dramatic transitions at a certain current dependent critical field value, where the microwave frequency drops 10 GHz, modulation sidebands appear, and the resistance exhibits a jump, while the magnetoresistance changes sign. We interpret these observations as the nucleation of a magnetic droplet soliton with a large fraction of its magnetization processing with an angle greater than 90 degrees, i.e., around a direction opposite that of the applied field. This interpretation is corroborated by numerical simulations. When the field is further increased, we find that the droplet eventually collapses under the pressure from the Zeeman energy. (C) 2014 AIP Publishing LLC.

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