Spin-glass-like behavior in CoO nanoparticles and the origin of exchange bias in layered CoO/Ferromagnet structures
Spin-glass-like behavior in CoO nanoparticles and the origin of exchange bias in layered CoO/Ferromagnet structures
复制标题
DOI：
10.1103/physrevlett.95.077204
复制
发表时间：
2005-08-12
影响因子：
8.6
通讯作者：
Gruyters, M
中科院分区：
文献类型：
--
作者：
Gruyters, M
通过磁化和磁滞回线测量研究了CoO纳米颗粒和层状CoO/铁磁（FM）结构的磁性行为。在非晶态CoO中，自旋无补偿现象与冻结温度T-F（约215-220 K）以下的类自旋玻璃行为密切相关。自旋类玻璃相可以用伊辛自旋系的de Almeida-Thouless线来描述。层状CoO/FM结构中的交换偏置是由构成CoO膜的纳米颗粒的自旋玻璃态解释的。
The magnetic behavior of CoO nanoparticles and layered CoO/ferromagnetic (FM) structures has been investigated by magnetization and hysteresis loop measurements. In the amorphous CoO, a large uncompensation of spins is found that is closely related to spin-glass-like behavior below a freezing temperature T-F approximate to 215-220 K. The spin-glass-like phase may be described by the de Almeida-Thouless line for Ising spin systems. The exchange bias in the layered CoO/FM structures is explained by the spin-glass-like state in the nanoparticles constituting the CoO film.