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Magnetization and EPR studies of the single molecule magnet Ni$_4$ with integrated sensors

G. de Loubens·G. D. Chaves·A. D. Kent·C. Ramsey·E. del Barco·C. Beedle·D. N. Hendrickson
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Abstract

Integrated magnetic sensors that allow simultaneous EPR and magnetization measurements have been developed to study single molecule magnets. A high frequency microstrip resonator has been integrated with a micro-Hall effect magnetometer. EPR spectroscopy is used to determine the energy splitting between the low lying spin-states of a Ni$_4$ single crystal, with an S=4 ground state, as a function of applied fields, both longitudinal and transverse to the easy axis at 0.4 K. Concurrent magnetization measurements show changes in spin-population associated with microwave absorption. Such studies enable determination of the energy relaxation time of the spin system.

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G. de Loubens, G. D. Chaves, A. D. Kent, C. Ramsey, E. del Barco, C. Beedle, D. N. Hendrickson. 2006-12-02. Magnetization and EPR studies of the single molecule magnet Ni$_4$ with integrated sensors. https://doi.org/10.1063/1.2693727

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