Abstract
From ancient rudimentary investigations through modern intensive research, a seemingly simple question regarding glassy materials remains unanswered: do history-dependent phenomena disappear when a system relaxes sufficiently? The present study gives an answer by applying indirect but simple approaches to a canonical spin-glass phase of a CuMn alloy. We find that the zero-field-cooled magnetization of the equilibrium state never matches the field-cooled magnetization, even if the observation continues indefinitely. This finding clearly demonstrates a permanency of hysteresis, which has been predicted by recent theories for spin-glasses.
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