Unified nonequilibrium dynamical theory for exchange bias and training effects |
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| Authors: | Zhang Kai-Cheng and Liu Bang-Gui |
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| Affiliation: | Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China |
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| Abstract: | We have investigated the exchange bias and training effect in the
ferromagnetic/antiferromagnetic (FM/AF) heterostructures using a
unified Monte Carlo dynamical approach. The magnetization of the
uncompensated AF layer is still open after the first field cycling
is finished. Our simulated results show obvious shift of hysteresis
loops (exchange bias) and cycling dependence of exchange bias
(training effect) when the temperature is below 45~K. The exchange
bias field decreases with decreasing cooling rate or increasing
temperature and the number of the field cycling. Essentially, these
two effects can be explained on the basis of the microscopical
coexistence of both reversible and irreversible moment reversals of
the AF domains. Our simulations are useful to understand the real
magnetization dynamics of such magnetic heterostructures. |
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| Keywords: | ferromagnetic/antiferromagnetic
bilayers hysteresis exchange bias training |
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