Phase-resolved ferromagnetic resonance using heterodyne detection method

Published

April 28, 2016

Author(s)

Seungha Yoon, Hau Jian Liu, Robert D. McMichael

Abstract

This paper describes a phase-resolved ferromagnetic resonance (FMR) measurement using a heterodyne method. Spin precession is driven by microwave fields and detected by 1550 nm laser light that is modulated at a frequency slightly shifted with respected to the FMR driving frequency. The evolving phase difference between the spin precession and the modulated light produces a slowly oscillating Kerr rotation signal with a phase equal to the precession phase plus a phase due to the path length difference between the excitation microwave signal and the optical signal. We estimate the accuracy of the precession phase measurement to be 0.1 rad. This heterodyne FMR detection method eliminates the need for field modulation and allows a stronger detection signal at higher frequency where the 1/f noise floor is reduced.

Citation

Physical Review B

Volume

93

Issue

14

Pub Type

Journals

Download Paper

https://doi.org/10.1103/PhysRevB.93.144423

Keywords

Ferromagnetic Resonance, Heterodyne, Nanomagnetics

Citation

Yoon, S. , , H. and McMichael, R. (2016), Phase-resolved ferromagnetic resonance using heterodyne detection method, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.93.144423 (Accessed October 27, 2025)