Date of Award

Fall 5-13-2016

Degree Type


Degree Name


Degree Program

Applied Physics



Major Professor

Spinu, Leonard

Second Advisor

Malkinski, Leszek

Third Advisor

Stokes, Kevin


The high-frequency properties of coupled magnetic systems have been investigated using vector network analyzer ferromagnetic resonance (VNA-FMR) spectroscopy. SAF structures consist of two ferromagnetic layers separated by a non-magnetic spacer, coupled through the indirect exchange interaction. The ferromagnetic layers of our samples were composed of FeCoB separated by a layer of Ru. The thickness of Ru was varied in the range of 8 to 18 Å among the samples studied. Antiferromagnetic coupling can be quickly identified by the major hysteresis loop (MHL).

A new way of displaying FMR data for these trilayer samples is presented which completely preserves the anisotropy effects while fully characterizing the angular dependence of FMR. The advantage of our representation is that the high-frequency data can be easily compared to the static switching behavior at any angle obtained through susceptibility measurements.

Ferromagnetic resonance; Coupled; Synthetic antiferromagnet; Magnetization switching


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