High-sensitivity ferromagnetic resonance measurements on micrometer-sized samples
- 19 May 1997
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 70 (20) , 2756-2758
- https://doi.org/10.1063/1.118974
Abstract
Ferromagnetic resonance measurements were taken on a 4 μm diam disk using a planar microwave transmission line device. The absorption modes of a sample placed on this device can be measured by monitoring the microwave power transmitted across the device while a swept magnetic field varies the sample absorption through resonance. Results for the disk, which was etched from a 105 nm thick amorphous Fe80B15Si5 film, followed the Kittel model over the frequency range from 2 to 20 GHz, in agreement with parameters measured on 5 mm diam disks by a microwave cavity. These results indicate the device has a sensitivity of 3×109⋅ΔH spins, almost two orders of magnitude better than microwave cavity measurements.Keywords
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