Butterfly hysteresis curve is a signature of adiabatic Landau-Zener transition

Mark Vogelsberger; D. A. Garanin; Rolf Schilling

doi:10.1103/physrevb.73.092412

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Butterfly hysteresis curve is a signature of adiabatic Landau-Zener transition

Mark Vogelsberger·D. A. Garanin·Rolf Schilling

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Abstract

We stress that the so-called butterfly hysteresis curves observed in dynamical magnetization measurements on systems of low-spin magnetic molecules such as V-15 and V-6 are a signature of adiabatic Landau-Zener transitions rather than that of a phonon bottleneck. We investigate the magnetization dynamics analytically with the help of a simple relaxation theory in the basis of the adabatic energy levels of the spin 1/2, to a qualitative accordance with experimental observations. In particular, reversible behavior is found near zero field, the corresponding susceptibility being bounded by the equilibrium and adiabatic susceptibilities from below and above, respectively.

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Mark Vogelsberger, D. A. Garanin, Rolf Schilling. 2005-07-26. Butterfly hysteresis curve is a signature of adiabatic Landau-Zener transition. https://doi.org/10.1103/physrevb.73.092412

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