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A proposed method for electronic feedback compensation of damping in ferromagnetic resonance

Journal of Magnetism and Magnetic Materials, ISSN: 0304-8853, Vol: 443, Page: 131-136
2017
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Article Description

We propose an experimental technique for extending feedback compensation of dissipative radiation used in nuclear magnetic resonance (NMR) to encompass ferromagnetic resonance (FMR). This method uses a balanced microwave power detector whose output is phase shifted π/2, amplified, and fed back to drive precession. Using classical control theory, we predict an electronically controllable narrowing of field swept FMR line-widths. This technique is predicted to compensate other sources of spin dissipation in addition to radiative loss.

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