Reversal-field memory in magnetic hysteresis

  title={Reversal-field memory in magnetic hysteresis},
  author={Helmut G. Katzgraber and Ferenc P{\'a}zm{\'a}ndi and Christopher R. Pike and Kai Liu and Richard Scalettar and Kenneth Lee Verosub and Gergely T. Zim{\'a}nyi},
  journal={Journal of Applied Physics},
We report results demonstrating a singularity in the hysteresis of magnetic materials, the reversal-field memory effect. This effect creates a nonanalyticity in the magnetization curves at a particular point related to the history of the sample. The microscopic origin of the effect is associated with a local spin-reversal symmetry of the underlying Hamiltonian. We show that the presence or absence of reversal-field memory distinguishes two widely studied models of spin glasses (random magnets). 
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