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Abstract #1528

Amplitude-modulated continuous wave excitation

Kelvin J. Layton 1 , Bahman Tahayori 1 , James Korte 1 , Iven M. Y. Mareels 1 , Peter M. Farrell 1 , and Leigh A. Johnston 1

1 Department of Electrical and Electronic Engineering, The University of Melbourne, Melbourne, Victoria, Australia

The response of the magnetization to amplitude-modulated continuous wave RF excitation is investigated with theory and experiments. Proof-of-concept measurements of the steady-state magnetization waveform demonstrate substantial frequency components at harmonics of the modulation frequency, emphasizing the nonlinear nature of the spin system. Experiments are in excellent agreement with theoretical expressions derived from the Bloch equations. Furthermore, experiments show that the steady-state magnetization is relatively large when the amplitude of the field matches the modulation frequency, establishing a secondary resonance condition not previously observed in magnetic resonance systems.

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