混合界面Fe/Sm-Co交换弹簧双层膜的磁结构
Magnetic Structure in Fe/Sm-Co Exchange Spring Bilayers with Intermixed Interfaces
摘要：
通过极化中子反射计和微磁学模拟的互补研究，确定了在接近最佳的弹簧-磁体条件下制备的Fe/Sm-Co双层膜的内禀磁性的深度分布。我们发现在Fe/Sm-Co界面处，磁性在8 nm尺度上逐渐变化。在这个混合的界面区域，饱和磁化强度和磁各向异性是较低的，交换刚度是高于从模型的基础上的Fe和Sm-Co相的混合物估计的值。因此，混合界面在Fe和Sm-Co层之间产生了优异的交换耦合，但以平均磁化强度为代价。
英文摘要：
The depth profile of the intrinsic magnetic properties in an Fe/Sm-Co bilayer fabricated under nearly optimal spring-magnet conditions was determined by complementary studies of polarized neutron reflectometry and micromagnetic simulations. We found that at the Fe/Sm-Co interface the magnetic properties change gradually at the length scale of 8 nm. In this intermixed interfacial region, the saturation magnetization and magnetic anisotropy are lower and the exchange stiffness is higher than values estimated from the model based on a mixture of Fe and Sm-Co phases. Therefore, the intermixed interface yields superior exchange coupling between the Fe and Sm-Co layers, but at the cost of average magnetization.
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