Quantum tunneling in a three dimensional network of exchange coupled single-molecule magnets

Details Quantum tunneling in a three dimensional network of exchange coupled single-molecule magnets Quantum tunneling in a three dimensional network of exchange coupled single-molecule magnets

2003-06-26

arxiv.org/abs/cond-mat/0306669v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.68.140407

A Mn4 single-molecule magnet (SMM) is used to show that quantum tunneling of magnetization (QTM) is not suppressed by moderate three dimensional exchange coupling between molecules. Instead, it leads to an exchange bias of the quantum resonances which allows precise measurements of the effective exchange coupling that is mainly due to weak intermolecular hydrogen bounds. The magnetization versus applied field was recorded on single crystals of [Mn4]2 using an array of micro-SQUIDs. The step fine structure was studied via minor hysteresis loops.

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