Pinholes in antiferromagnetically coupled multilayers: Effects on hysteresis loops and relation to biquadratic exchange
Pinholes in antiferromagnetically coupled multilayers: Effects on hysteresis loops and relation to biquadratic exchange
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DOI：
10.1103/physrevb.60.4131
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发表时间：
1999-08-01
影响因子：
3.7
通讯作者：
White, RL
中科院分区：
文献类型：
--
作者：
Bobo, JF;Kikuchi, H;White, RL
我们对反铁磁耦合多层中连续铁磁层之间的铁磁桥的影响进行了微磁研究。将该模型与Co-Cu和FeNi-Ag多层体系的滞回线实验结果进行了比较。透射电镜证实了铜钴多层膜中针孔的存在。我们证明，在这种多层中，低密度的铁磁针孔足以引起与预期的双线性层间耦合的显著偏差，并改变观察到的层间振荡交换耦合。在某些情况下，针孔的影响可以通过双二次交换耦合来模拟，我们提出了一个将表观双线性和双二次耦合与针孔密度、尺寸和层间交换强度联系起来的磁相图。[s0163 - 1829(99) 14529 - 6]。
We present a micromagnetic study of the influence of ferromagnetic bridges between consecutive ferromagnetic layers in antiferromagnetically coupled multilayers. The model is compared with experimental results for hysteresis loops obtained from the multilayer systems Co-Cu and FeNi-Ag. The presence of pinholes in Cu-Co multilayers is confirmed by transmission electron microscopy. We demonstrate that low densities of ferromagnetic pinholes in such multilayers are sufficient to give rise to significant deviations from the expected bilinear interlayer coupling and modify the observed interlayer: oscillatory exchange coupling. The effects of pinholes can be simulated in certain cases by biquadratic exchange coupling, and we propose a magnetic phase diagram which correlates the apparent bilinear and biquadratic couplings to the pinholes density, size, and interlayer exchange strength. [S0163-1829(99)14529-6].