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Bilinear and biquadratic exchange coupling in Fe(110)/Cr/Fe trilayers

机译:Fe(110)/ Cr / Fe三层中的双线性和双二次交换耦合

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The indirect exchange coupling in W(110)/Fe/Cr/Fe/Cr trilayers was determined by analysis of magnetization curves measured by Kerr magnetometry. We adjusted the uniaxial in-plane anisotropies in the two Fe layers in such a way that the easy axes were orthogonal, [001] in the 1 st, [110] in the 2nd layer, This allows an independent determination of both bilinear (J_1) and biquadratic (J_2) coupling constants. We determined J_1 and J_2 as a function of Cr interlayer thickness (t_Cr=0-4 nm), preparation temperature of the interlayer T_p,Cr =100-500K, and as a function of temperature (T=100-300 K). Results for the exchange coupling are correlated to the particular lateral thickness fluctuaftion of the Cr spacer.
机译:W(110)/ Fe / Cr / Fe / Cr三层中的间接交换耦合是通过分析由Kerr磁力法测得的磁化曲线确定的。我们调整了两个Fe层中的单轴面内各向异性,使得易轴正交,第一层为[001],第二层为[110],这样就可以独立确定两个双线性(J_1 )和双二次(J_2)耦合常数。我们确定J_1和J_2是Cr中间层厚度(t_Cr = 0-4 nm),中间层的制备温度T_p,Cr = 100-500K和温度(T = 100-300 K)的函数。交换耦合的结果与Cr垫片的特定横向厚度波动相关。

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