Time-domain measurement of driven ferromagnetic resonance
Y. Guan, W. E. Bailey, E. Vescovo, C.-C. Kao, and D. A. Arena
TL;DR
This paper demonstrates a time-resolved, quantitative measurement of ferromagnetic resonance in NiFe using x-ray magnetic circular dichroism, revealing phase and amplitude details at 2.3 GHz.
Contribution
It introduces a novel application of time-resolved XMCD for directly measuring small-angle FMR precession in a single ferromagnetic layer.
Findings
Quantitative measurement of <1° precession angle.
Verification of driven resonance behavior at 2.3 GHz.
High sensitivity to phase and amplitude of FMR motion.
Abstract
We present a time-resolved measurement of magnetization dynamics during ferromagnetic resonance (FMR) in a single layer of Ni81Fe19. Small-angle (<1 deg.) precession of elemental Ni, Fe moments could be measured directly and quantitatively using time-resolved x-ray magnetic circular dichroism (XMCD) in transmission. The high temporal and rotational sensitivity of of this technique has allowed characterization of the phase and amplitude of driven FMR motion at 2.3 GHz, verifying basic expectations for a driven resonance.
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Taxonomy
TopicsMagnetic properties of thin films · Advanced NMR Techniques and Applications · Crystallography and Radiation Phenomena