摘要
Based on Monte Carlo simulations,the effect of structural configuration on the hysteresis behavior and tunneling magnetoresistance(TMR) of composite nanoparticles with ferromagnetic(FM) core/anti-ferromagnetic(AFM) shell is investigated.The simulated results indicate that the coercive field(H c) of composites increases with the decreasing ratio of core-radius(r core) to shell-radius(r shell).When the ratio of r shell to r core is approaching 4:3,H c decreases with increasing AFM thickness.In addition,TMR is found to increase with the decreasing ratio of r core to r shell,resulting from the enhancement of resistance changes in disordered AFM shell.
Based on Monte Carlo simulations, the effect of structural configuration on the hysteresis behavior and tunneling magnetoresistance （TMR） of composite nanoparticles with ferromagnetic （FM） core/anti-ferromagnetic （AFM） shell is investigated. The simulated results indicate that the coercive field （Hc） of composites increases with the decreasing ratio of core-radius （rcore） to shell-radius （rshell）. When the ratio of rshell to rcore is approaching 4：3, Hc decreases with increasing AFM thickness. In addition, TMR is found to increase with the decreasing ratio of rcore to rshell, resulting from the enhancement of resistance changes in disordered AFM shell.
基金
supported by the National Natural Science Foundation of China (Grant No. 11074039)
the National Key Project for Basic Research of China (Grant No. 2011CBA00200)
