Related Experiment Video
Updated: Jun 5, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
Parametric excitation of a magnetic nanocontact by a microwave field
Sergei Urazhdin1, Vasil Tiberkevich, Andrei Slavin
1Department of Physics, West Virginia University, Morgantown, West Virginia 26506, USA.
Abstract:
We demonstrate that magnetic oscillations of a current-biased magnetic nanocontact can be parametrically excited by a microwave field applied at twice the resonant frequency of the oscillation. The threshold microwave amplitude for the onset of the oscillation decreases with increasing bias current, and vanishes at the transition to the auto-oscillation regime. Theoretical analysis shows that measurements of parametric excitation provide quantitative information about the relaxation rate, the spin transfer efficiency, and the nonlinearity of the nanomagnetic system.
Related Concept Videos
Atomic Nuclei: Nuclear Relaxation Processes
Magnetic Fields
A magnetic field is defined by the force that a charged particle experiences...
Standing Waves in a Cavity
Atomic Nuclei: Magnetic Resonance
Magnetic Field due to Moving Charges
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Paramagnetism