The exchange bias and coercivity of FM/AFM films: Monte Carlo simulation |
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Authors: | Zhigao Huang Shangdong Li Haishan Lin Fengming Zhang Youwei Du |
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Institution: | 1. Department of Physics, Fujian Normal University, Fuzhou 350007, China;2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China |
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Abstract: | The exchange bias (HE) and coercivity (HC) of the ferromagnet/antiferromagnet (FM/AFM) films have been simulated with Monte Carlo method. The simulated results indicate that, the value of HE decreases with increasing temperature, and the values of HE and the blocking temperature Tb at which HE=0 reduce evidently with decreasing absolute value of interlayer exchange coupling JI. It also is found that for the large absolute values of JI, the maximum in HC occurs very close to Tb. At the same time, it is observed that the diluted ratio of FM at FM/AFM interface influences clearly the value of HE. The simulated results are consistent with the experimental facts. The maximum behaviour in the HC−T curves has been explained by the interplay of the softening of some fraction of the spins in the AFM layer near TN′ and the disorder of the spins in FM layer near Curie temperature TC. |
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Keywords: | 75 60 Jk 75 40 Mg 75 70 &minus i |
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