Abstract
A comprehensive spectroscopic study of the magnetization relaxation of ${\text{Mn}}_{12}\text{Ac}$ is presented. The single crystalline samples are investigated as a function of magnetic field and temperature using frequency-domain magnetic-resonance spectroscopy. The magnetization relaxation is followed in real-time by recording spectra as a function of delay time. The experiments are performed both in the absence of a magnetic field and in external fields either parallel (Faraday geometry) or perpendicular (Voigt geometry) to the direction of radiation. The relaxation rates obtained from spectral fits correspond well to those obtained from magnetometric measurements. The results exhibit clear signatures of quantum tunneling of the magnetization. The influence of $D$ strain and internal dipolar fields is observed.
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