Spin torque oscillator frequency versus magnetic field angle : The prospect of operation beyond 65 GHz

• We study the impact of the magnetic field angle on the oscillation frequency of a nanocontact spin torque oscillator (STO) in magnetic fields up to 2.1 T. A model based on a single nonlinear, nonpropagating spin wave mode is found to explain the experimental data. We observe oscillation frequencies as high as 46 GHz in high magnetic fields applied normal to the film plane, and we are able to extrapolate the maximum expected operating frequency to beyond 65 GHz for in-plane magnetic fields. The STO signal remains surprisingly strong at these conditions, which opens up for possible millimeter-wave applications.

Nyckelord

cobalt alloys

copper

iron alloys

nanocontacts

nanoelectronics

nickel alloys

oscillators

spin valves

spin waves

microwave generation

driven

multilayers

emission

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)