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

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

2006-12-02

arxiv.org/abs/cond-mat/0612060v1

J. Appl. Phys. 101, 09E104 (2007)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, accepted for publication (Proceedings of the 10th Joint MMM/Intermag Conference, which will be published a

Scientific paper

10.1063/1.2693727

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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