Abstract
We study the magnetotransport in a magnetic-particle chain by Monte Carlo simulation. The influence of the correlations between magnetic particles on the system’s conductance is studied and an unusual tunneling magnetoresistance (TMR) effect is shown in the magnetic-particle chain. A large negative TMR at room temperature is obtained due to the strong magnetic interaction between particles. A separated hysteresis loop of TMR is observed at low temperature, and a large positive TMR peak appears at the coercive field. Both the theoretical calculation and the Monte Carlo simulation show an enhancement of TMR as the magnetic energy increases.
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