Department of Physics and Astronomy, University of Leicester , Leicester LE1 7RH, United Kingdom.
Nano Lett. 2013 Jul 10;13(7):3334-9. doi: 10.1021/nl401587t. Epub 2013 Jun 12.
We have used X-ray magnetic circular dichroism and magnetometry to study isolated Fe@Cr core-shell nanoparticles with an Fe core diameter of 2.7 nm (850 atoms) and a Cr shell thickness varying between 1 and 2 monolayers. The addition of Cr shells significantly reduces the spin moment but does not change the orbital moment. At least two Cr atomic layers are required to stabilize a ferromagnetic/antiferromagnetic interface and generate the associated exchange bias and increase in coercivity.
我们使用 X 射线磁圆二色性和磁强计研究了孤立的 Fe@Cr 核壳纳米粒子，其 Fe 核直径为 2.7nm（850 个原子），Cr 壳厚度在 1 到 2 单层之间变化。添加 Cr 壳显著降低了自旋矩，但不改变轨道矩。至少需要两个 Cr 原子层来稳定铁磁/反铁磁界面，并产生相关的交换偏置和矫顽力增加。
