Effect of Antiferromagnet on Exchange Bias in Systems with Antiferromagnetic Interfacial Coupling and Inverted Ferromagnetic–Antiferromagnetic Core-Matrix Morphology
Abstract:A modified Monte Carlo Metropolis method is performed to simulate the effects of antiferromagnetic exchange interaction JAF and anisotropy KAF on exchange bias field HE and coercivity HC in the nanoparticle systems with antiferromagnetic interfacial coupling and inverted ferromagnetic–antiferromagnetic core-matrix morphology after cooling in weak and strong fields HCF, respectively. The results show that the JAF dependence of HE is insensitive, except obvious changes occur at intermediate JAF for two HCF. When the values of JAF are weak, the absolute values of HE may keep at a relatively large value. HC has a peak at approximately JAF = −0.6 with the increase of JAF for weak HCF, while the opposite trend appears for the case of strong HCF. HE is negative and its absolute value increases with the increase of KAF for weak HCF, so does the trend of HE with KAF for strong HCF as KAF ≤ 6. However, with further increase of KAF for strong HCF, HE varies from the negative value to the positive value. Whereas HC for two values of HCF both decrease and finally level off with increasing KAF. Variations of antiferromagnetic exchange interaction and anisotropy may alter the net magnetization and the pinning ability of spins on the surface of frustrated antiferromagnetic cores, resulting in the change of pinning configuration in the antiferromagnet during the magnetization reversal of ferromagnetic spins to influence the exchange bias.
Document Type: Research Article
Publication date: November 1, 2010
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