Quantum Step Heights in Hysteresis Loops of Molecular Magnets

Details Quantum Step Heights in Hysteresis Loops of Molecular Magnets Quantum Step Heights in Hysteresis Loops of Molecular Magnets

2001-05-25

arxiv.org/abs/cond-mat/0105497v4

Phys. Rev. B 65 (2002) 224401

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.65.224401

We present an analytical theory on the heights of the quantum steps observed in the hysteresis loops of molecular magnets. By considering the dipolar interaction between molecular spins, our theory successfully yields the step heights measured in experiments, and reveals a scaling law for the dependence of the heights on the sweeping rates hidden in the experiment data on Fe$_8$ and Mn$_4$. With this theory, we show how to accurately determine the tunnel splitting of a single molecular spin from the step heights.

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