磁晶各向异性对反铁磁耦合纳米体系磁特性的影响

Effect of Magnetic Anisotropy on Magnetic Properties of Antiferromagnetically Exchange Coupled Nanometer System

采用微磁学方法研究了磁性层的磁晶各向异性对反铁磁耦合三层纳米体系磁特性的影响.结果表明:随着磁性层磁晶各向异性的增大,反铁磁耦合三层纳米体系具有4种不同类型的磁滞回线,上、下磁性层的反转场逐渐减小,而饱和场先减小后增大.当磁晶各向异性较小时,反磁化过程为反磁化核的形成与传播过程;当磁晶各向异性很大时,反磁化过程为先形成多畴微磁结构,再逐渐反转的过程.

The magnetic properties of antiferromagnetically exchange coupled ternary layers nanometer system is investigated by micromagnetics simulation. Increasing the magnetic anisotropy of ferromagnetic layers we obtained four types of the hysteresis loops. With the increase of magnetic anisotropy of ferromagnetic layers, the switching field of the top and bottom ferromagnetic layers gradually decreases and the Saturation field of the system firstly decrease, then increase. When magnetic anisotropy become weaker, the process of magnetization reversal, which is inconsistent reversal, will accompany the vortex domain formation and dissemination. When coupling strength become stronger, the process of magnetization reversal will firstly accompany the emergence of multiplying domain, and then gradually reverse.