Spin dynamics in a superconductor / ferromagnet proximity system
C. Bell, S. Milikisyants, M. Huber, and J. Aarts
TL;DR
This study investigates how superconductivity in Nb affects spin dynamics in Ni80Fe20/Nb heterostructures, revealing a dynamic proximity effect that alters ferromagnetic resonance and damping properties.
Contribution
It demonstrates the influence of superconductivity on ferromagnetic resonance and damping in ferromagnet/superconductor heterostructures, highlighting a dynamic proximity effect.
Findings
Resonance sharpening below superconducting transition
Decrease in effective Gilbert damping coefficient
Superconductivity influences spin transport across the entire ferromagnetic layer
Abstract
The ferromagnetic resonance of thin sputtered Ni80Fe20 films grown on Nb is measured. By varying the temperature and thickness of the Nb the role of the superconductivity on the whole ferromagnetic layer in these heterostructures is explored. The change in the spin transport properties below the superconducting transition of the Nb is found to manifest itself in the Ni80Fe20 layer by a sharpening in the resonance of the ferromagnet, or a decrease in the effective Gilbert damping co-efficient. This dynamic proximity effect is in contrast to low frequency studies in these systems, where the effect of the superconductor is confined to a small region in the ferromagnet. We interpret this in terms of the spin pumping model.
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