Spin dynamics at low microwave frequencies in crystalline Fe ultrathin film double layers using co-planar transmission lines

Magnetic damping has been studied in magnetic double layers using a network analyzer (NA) with a coplanar transmission line. The magnetic films consisted of ultrathin crystalline films of Fe separated by an Au spacer. The films were deposited on GaAs(0 0 1) substrates using the molecular beam epitax...

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Published in:Journal of magnetism and magnetic materials 2006-05, Vol.300 (1), p.174-178
Main Authors: Mosendz, O., Kardasz, B., Schmool, D.S., Heinrich, B.
Format: Article
Language:English
Subjects:
Coplanar transmission line
Crystalline anisotropy
FMR
Gilbert damping
MBE
Network analyzer
Spin dynamics
Spin-pumping
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description Magnetic damping has been studied in magnetic double layers using a network analyzer (NA) with a coplanar transmission line. The magnetic films consisted of ultrathin crystalline films of Fe separated by an Au spacer. The films were deposited on GaAs(0 0 1) substrates using the molecular beam epitaxy (MBE) technique. NA-ferromagnetic resonance (NA-FMR) measurements were carried out along the magnetic hard axis, allowing one to follow the frequency FMR linewidth down to the 1 GHz range of frequencies. It will be shown that the FMR linewidth in the NA-FMR measurements is not entirely described by Gilbert damping. The additional contribution in the frequency linewidth increases with decreasing frequency, and is most likely caused by dipolar fields associated with an inhomogeneous RF field around the coplanar transmission line.
doi_str_mv 10.1016/j.jmmm.2005.10.058
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subjects Coplanar transmission line
Crystalline anisotropy
FMR
Gilbert damping
MBE
Network analyzer
Spin dynamics
Spin-pumping
title Spin dynamics at low microwave frequencies in crystalline Fe ultrathin film double layers using co-planar transmission lines
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