Generation linewidth of mode-hopping spin torque oscillators
Artikel i vetenskaplig tidskrift, 2014

Experiments on spin torque oscillators commonly observe multimode signals. Recent theoretical works have ascribed the multimode signal generation to coupling between energy-separated spin wave modes. Here, we analyze in detail the dynamics generated by such mode coupling. We show analytically that the mode-hopping dynamics broaden the generation linewidth and makes it generally well described by a Voigt line shape. Furthermore, we show that the mode-hopping contribution to the linewidth can dominate, in which case it provides a direct measure of the mode-hopping rate. Due to the thermal drive of mode-hopping events, the mode-hopping rate also provides information on the energy barrier separating modes and temperature-dependent linewidth broadening. Our results are in good agreement with experiments, revealing the physical mechanism behind the linewidth broadening in multimode spin torque oscillators.

MAGNETORESISTANCE

EXCITATION

MAGNETIC DROPLET SOLITONS

MULTILAYER

Författare

Ezio Iacocca

Göteborgs universitet

O. Heinonen

Pranaba Muduli Kishor

Göteborgs universitet

Johan Åkerman

Göteborgs universitet

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 89 5

Ämneskategorier

Fysik

DOI

10.1103/PhysRevB.89.054402