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 May 1, 2025)
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Phase-resolved ferromagnetic resonance using heterodyne detection method
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Author(s)
, ,
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
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Keywords
Ferromagnetic Resonance, Heterodyne, Nanomagnetics
Citation
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Created April 28, 2016, Updated November 10, 2018