Enhancement of magnetic coercivity and macroscopic quantum tunneling in monodispersed Co/CoO cluster assemblies
Enhancement of magnetic coercivity and macroscopic quantum tunneling in monodispersed Co/CoO cluster assemblies
复制标题
单分散 Co/CoO 团簇组件中磁矫顽力和宏观量子隧道效应的增强
DOI：
10.1063/1.125479
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发表时间：
1999
影响因子：
4
通讯作者：
S. Yamamuro
中科院分区：
文献类型：
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作者：
D. Peng;K. Sumiyama;T. Hihara;S. Yamamuro
测量了通过等离子气体凝聚型团簇束沉积技术制备的单分散尺寸的 Co/CoO 团簇组件的磁性。交换偏置场和矫顽力之间获得的清晰相关性表明，由于铁磁Co核和反铁磁CoO壳之间的交换耦合以及核-壳界面处的磁紊乱，单轴各向异性增强。在 8 K 以下观察到的非热磁弛豫（称为磁化的宏观量子隧道效应）归因于增强的单轴各向异性。
Magnetic properties have been measured for monodisperse-sized Co/CoO cluster assemblies prepared by a plasma-gas-condensation-type cluster beam deposition technique. The clear correlation obtained between exchange bias field and coercivity suggests the enhancement of uniaxial anisotropy owing to the exchange coupling between the ferromagnetic Co core and antiferromagnetic CoO shell, and magnetic disorder at the core–shell interface. A nonthermal magnetic relaxation observed below 8 K, being referred to as macroscopic quantum tunneling of the magnetization, is ascribed to the enhanced uniaxial anisotropy.
S.Yamamuro：“纳米级共簇组件中的几何和电渗透”J.Phys.Cond.Mat.in press。
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