Coercivity engineering of exchange biased magnetic multilayer samples for digital encoding applications
Coercivity engineering of exchange biased magnetic multilayer samples for digital encoding applications
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DOI：
10.1063/1.2798938
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发表时间：
2007-11
影响因子：
3.2
通讯作者：
F. V. Belle;T. Hayward;J. Bland;W. Lew
中科院分区：
文献类型：
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作者：
F. V. Belle;T. Hayward;J. Bland;W. Lew
本文系统地研究了用于生物技术中数字编码的CoFe/FeMn和CoFe/PdMn双层膜的交换偏置场和磁化率增强对铁磁（FM）和反铁磁（AF）层厚度的依赖关系。如果每个（双）层具有两种磁性状态（正饱和和负饱和），在剩磁时可用，并且如果每个层都可以通过其矫顽磁力唯一识别，则磁性多层结构可以用作数字编码标签。我们将证明，通过调整AF/FM双层中的AF和FM层的厚度，可以控制双层的偏置场和双折射率。通过将CoFe/FeMn双层与CoFe/PdMn双层进行对比，很明显，矫顽力增强和偏置场的相对大小取决于特定的AF材料，尽管定性行为保持不变。为了创造一个多层膜，可以保留许多磁状态之一，在剩磁，一个…
The dependence of the exchange bias field and coercivity enhancement on ferromagnetic (FM) and antiferromagnetic (AF) layer thickness in exchange biased bilayers has been systematically investigated in CoFe/FeMn and CoFe/PdMn bilayers for digital encoding applications in biotechnology. A magnetic multilayer structure can be used as a digitally encoded tag if each (bi)layer has two magnetic states, positive and negative saturation, available at remanence and if each layer can be uniquely identified by its coercivity. We will demonstrate that by adjusting the AF and FM layer thickness in an AF/FM bilayer, both the bias field and the coercivity of the bilayer can be controlled. By contrasting CoFe/FeMn bilayers with CoFe/PdMn bilayers, it becomes apparent that the relative magnitudes of the coercivity enhancement and bias field depend on the particular AF material, although the qualitative behavior remains unchanged. In order to create a multilayer that can retain one of many magnetic states at remanence, a ...