Nontrivial resonance of nanoscale uniaxial magnets to alternating field

Abstract

How nanoscale uniaxial magnets respond to an alternating field is studied by direct numerical calculation. A nontrivial oscillation of the magnetization is found, which is analyzed in terms of the non-adiabatic transition due to the time dependent field. A new method to estimate the tunneling gap of the magnet is proposed.

10 pages revtex including 7 figures in postscript

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