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首页> 外文期刊>Physical review >Antiferromagnetic layer thickness dependence of noncollinear uniaxial and unidirectional anisotropies in NiFe/FeMn/CoFe trilayers
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Antiferromagnetic layer thickness dependence of noncollinear uniaxial and unidirectional anisotropies in NiFe/FeMn/CoFe trilayers

机译：NiFe / FeMn / CoFe三层中非共线单轴和单向各向异性的反铁磁层厚度依赖性

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摘要

We have investigated the dependence of magnetic anisotropies of the exchange-biased NiFe/FeMn/CoFe trilayers on the antiferromagnetic (AF) layer thickness (t_(AF)) by measuring in-plane angular-dependent ferromagnetic resonance fields. The resonance fields of NiFe and CoFe sublayers are shifted to lower and higher values compared to those of single unbiased ferromagnetic (F) layers, respectively, due to the interfacial exchange coupling when t_(AF)≥2 nm. In-plane angular dependence of resonance field reveals that uniaxial and unidirectional anisotropies coexist in the film plane, however, they are not collinear with each other. It is found that these peculiar noncollinear anisotropies significantly depend on t_(AF). The angle of misalignment displays a maximum around t_(AF)=5 nm and converges to zero when t_(AF) is thicker than 10 nm. Contributions from thickness-dependent AF anisotropy and spin frustrations at both F/AF interfaces due to the structural imperfections should be accounted in order to understand the AF-layer thickness dependence of noncollinear magnetic anisotropies.
机译：我们已经通过测量面内角度相关的铁磁共振场研究了交换偏置的NiFe / FeMn / CoFe三层的磁各向异性对反铁磁（AF）层厚度（t_（AF））的依赖性。由于当t_（AF）≥2nm时的界面交换耦合，与单个无偏铁磁（F）层的共振场相比，NiFe和CoFe子层的共振场分别移至较低和较高的值。共振场的面内角度依赖性揭示了膜平面中共存单轴和单向各向异性，但是它们并不共线。发现这些特殊的非共线各向异性极大地取决于t_（AF）。未对准的角度在t_（AF）= 5 nm附近显示最大值，并且当t_（AF）厚于10 nm时收敛到零。为了理解非共线磁性各向异性的AF层厚度依赖性，应考虑由于结构缺陷而引起的厚度依赖性AF各向异性和两个F / AF界面处的自旋失意的贡献。

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