Reversal-Field Memory in the Hysteresis of Spin Glasses

Abstract

We report a novel singularity in the hysteresis of spin glasses, the reversal-field memory effect, which creates a non-analyticity in the magnetization curves at a particular point related to the history of the sample. The origin of the effect is due to the existence of a macroscopic number of "symmetric clusters" of spins associated with a local spin-reversal symmetry of the Hamiltonian. We use First Order Reversal Curve (FORC) diagrams to characterize the effect and compare to experimental results on thin magnetic films. We contrast our results on spin glasses to random magnets and show that the FORC technique is an effective "magnetic fingerprinting" tool.

4 pages, 6 figures

References in corpus (3)

• Hysteresis and hierarchies: dynamics of disorder-driven first-order phase transformations
• Self-organized criticality in the hysteresis of the Sherrington - Kirkpatrick model
• Theory of Hysteresis Loop in Ferromagnets

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