Parametric excitation in a magnetic tunnel junction-based spin torque oscillator
Artikel i vetenskaplig tidskrift, 2014

Using microwave current injection at room temperature, we demonstrate parametric excitation of a magnetic tunnel junction (MTJ)-based spin-torque oscillator (STO). Parametric excitation is observed for currents below the auto-oscillation threshold, when the microwave current frequency f(e) is twice the STO free-running frequency f(0). Above threshold, the MTJ becomes parametrically synchronized. In the synchronized state, the STO exhibits an integrated power up to 5 times higher and a linewidth reduction of two orders of magnitude, compared to free-running conditions. We also show that the parametric synchronization favors single mode oscillations in the case of multimode excitation. (C) 2014 AIP Publishing LLC.

DRIVEN

MODULATION

PHASE-LOCKING

WAVES

MULTILAYERS

NANO-OSCILLATORS

Författare

Philipp Dürrenfeld

Göteborgs universitet

Ezio Iacocca

Göteborgs universitet

Johan Åkerman

Göteborgs universitet

Pranaba Muduli Kishor

Göteborgs universitet

Applied Physics Letters

0003-6951 (ISSN) 1077-3118 (eISSN)

Vol. 104

Ämneskategorier

Fysik

DOI

10.1063/1.4864166