2006
DOI: 10.1103/physrevb.73.092403
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Abstract: We have observed a glassy dynamics of the exchange bias properties in a granular system composed of Fe nanoparticles dispersed in a structurally and magnetically disordered ͑cluster glasslike͒ Fe oxide matrix. The exchange field, measured at T = 5 K, increases with increasing the time t w spent at T = 50 K, after applying the cooling field. During t w , the oxide phase evolves towards a lower energy configuration, resulting in a stronger interface exchange coupling with the Fe particle moments. Monte Carlo si…

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