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Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators

Journal article
Authors Sunjae Chung
Anders Eklund
Ezio Iacocca
Seyed Majid Mohseni
Sohrab Sani
Lake Bookman
Mark Hoefer
Randy K. Dumas
Johan Åkerman
Published in Nature Communications
Volume 7
Pages artikel nr 11209
ISSN 2041-1723
Publication year 2016
Published at Department of Physics (GU)
Pages artikel nr 11209
Language en
Links dx.doi.org/10.1038/ncomms11209
https://gup.ub.gu.se/file/189281
Subject categories Magnetism, Computer Systems, Nano Technology

Abstract

Static and dynamic magnetic solitons play a critical role in applied nanomagnetism. Magnetic droplets, a type of non-topological dissipative soliton, can be nucleated and sustained in nanocontact spin-torque oscillators with perpendicular magnetic anisotropy free layers. Here, we perform a detailed experimental determination of the full droplet nucleation boundary in the current–field plane for a wide range of nanocontact sizes and demonstrate its excellent agreement with an analytical expression originating from a stability analysis. Our results reconcile recent contradicting reports of the field dependence of the droplet nucleation. Furthermore, our analytical model both highlights the relation between the fixed layer material and the droplet nucleation current magnitude, and provides an accurate method to experimentally determine the spin transfer torque asymmetry of each device.

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