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Magnetic droplet solitons in orthogonal spin valves

Journal article
Authors Sunjae Chung
S. Majid Mohseni
A. Eklund
Philipp Dürrenfeld
Mojtaba Ranjbar
S. R. Sani
T. N. Anh Nguyen
Randy K. Dumas
Johan Åkerman
Published in Fizika Nizkikh Temperatur
Volume 41
Issue 10
Pages 1063-1068
ISSN 0132-6414
Publisher Institute for Low Temperature Physics and Engineering
Publication year 2015
Published at Department of Physics (GU)
Pages 1063-1068
Language en
Links dx.doi.org/10.1063/1.4932358
Keywords Magnetic droplet soliton, Magnetoresistance, Perpendicular anisotropy, Spin torque, Anisotropy, Magnetic devices, Magnetic fields, Magnetism, Nanowires, Nucleation, Solitons, Applied magnetic fields, Continuous transitions, Magnetic droplets, Magnetic field strengths, Spin transfer torque, Time resolved measurement, Drops
Subject categories Physical Sciences

Abstract

We review the recent experimental advancements in the realization and understanding of magnetic droplet solitons generated by spin transfer torque in orthogonal nanocontact based spin torque nanooscillators (STNOs) fabricated on extended spin valves and spin valve nanowires. The magnetic droplets are detected and studied using the STNO microwave signal and its resistance, the latter both quasistatically and time-resolved. The droplet nucleation current is found to have a minimum at intermediate magnetic field strengths and the nature of the nucleation changes gradually from a single sharp step well above this field, mode-hopping around the minimum, and continuous at low fields. The mode-hopping and continuous transitions are ascribed to droplet drift instability and re-nucleation at different time scales, which is corroborated by time-resolved measurements. We argue that the use of tilted anisotropy fixed layers could reduce the nucleation current further, move the nucleation current minimum to lower fields, and potentially remove the need for an applied magnetic field altogether. Finally, evidence of an edge mode droplet in a nanowire is presented. © Sunjae Chung, S. Majid Mohseni, Anders Eklund, Philipp Dürrenfeld, Mojtaba Ranjbar, Sohrab R. Sani, T.N. Anh Nguyen, Randy K. Dumas, and Johan Åkerman, 2015.

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