Abstract
We describe a magnetic resonance force microscopy experiment carried out using both afast-relaxing spin system and a frequency-modulation mode detection method, presenting avalidation of the measured signal and sensitivity. The detection method applied along witha self-excited cantilever oscillation worked stably without any serious interference due tospurious cantilever excitation despite application of first-harmonic microwave modulation,and thereby successfully created almost the maximum available signal. The signal couldbe measured without distortion while the magnetic field was swept at a rate of1.9 G s−1. The measured sensitivity approached the thermal noise limit of the cantilever with a highquality factor. The experimental results for both signal and noise were in good agreementwith theoretical predictions.
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