Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators
Artikel i vetenskaplig tidskrift, 2014

We study microwave signal generation as a function of drive current and applied perpendicular magnetic field in nano-contact spin torque oscillators (NC-STOs) based on orthogonal (pseudo) spin valves where the Co fixed layer has strong easy-plane anisotropy, and the [Co/Ni] free layer has a strong perpendicular magnetic anisotropy. The orthogonal NC-STOs exhibit a dramatic transition from the conventional ferromagnetic resonance-like spin wave mode to a magnetic droplet soliton mode. In particular, the field and current dependence of the droplet soliton near threshold are discussed. Near threshold the droplet soliton undergoes complex dynamics that include mode hopping, as evident in the experimental frequency domain and magnetoresistance response. © 2013 Elsevier B.V.

Spin torque oscillators

Perpendicular magnetic anisotropy

Magnetic droplet soliton

Magnetoresistance

Spin wave

Författare

S. M. Mohseni

S. R. Sani

Randy K. Dumas

Göteborgs universitet

J. Persson

T. N. Anh Nguyen

Sunjae Chung

Göteborgs universitet

Yevgen Pogoryelov

Göteborgs universitet

Pranaba Muduli Kishor

Göteborgs universitet

Ezio Iacocca

Göteborgs universitet

A. Eklund

Johan Åkerman

Göteborgs universitet

Physica B: Condensed Matter

0921-4526 (ISSN)

Vol. 435 84-87

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1016/j.physb.2013.10.023