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Magnetic droplet soliton nucleation in oblique fields

Journal article
Authors M. Mohseni
M. Hamdi
H. F. Yazdi
S. A. H. Banuazizi
Sunjae Chung
Sohrab Sani
Johan Åkerman
M. Mohseni
Published in Physical Review B
Volume 97
Issue 18
ISSN 2469-9950
Publication year 2018
Published at Department of Physics (GU)
Language en
Links https://doi.org/10.1103/PhysRevB.97...
Keywords spin torque oscillators, multilayers, excitation, waves, generation, Physics
Subject categories Condensed Matter Physics

Abstract

We study the auto-oscillating magnetodynamics in orthogonal spin-torque nano-oscillators (STNOs) as a function of the out-of-plane (OOP) magnetic-field angle. In perpendicular fields and at OOP field angles down to approximately 50 degrees, we observe the nucleation of a droplet. However, for field angles below 50 degrees, experiments indicate that the droplet gives way to propagating spin waves, in agreement with our micromagnetic simulations. Theoretical calculations show that the physical mechanism behind these observations is the sign changing of spin-wave nonlinearity (SWN) by angle. In addition, we show that the presence of a strong perpendicular magnetic anisotropy free layer in the system reverses the angular dependence of the SWN and dynamics in STNOs with respect to the known behavior determined for the in-plane magnetic anisotropy free layer. Our results are of fundamental interest in understanding the rich dynamics of nanoscale solitons and spin-wave dynamics in STNOs.

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