Enhanced exchange bias of isolated Co/CoO nanocaps
Enhanced exchange bias of isolated Co/CoO nanocaps
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增强孤立 Co/CoO 纳米帽的交换偏压
DOI：
10.1016/j.jallcom.2011.03.113
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发表时间：
2011-06
影响因子：
6.2
通讯作者：
张永军
中科院分区：
文献类型：
--
作者：
张永军
我们展示了通过氧化沉积在二维聚苯乙烯球阵列上的单个Co层来制备孤立的磁性Co/CoO纳米帽阵列。15 nm Co/CoO隔离帽状阵列的HE和HC比连续膜和较厚的纳米帽状结构有明显提高，约为相应连续膜的4倍，这归因于氧化处理后帽状结构边缘的磁极限形成了隔离的磁性单畴态.当使用不同尺寸的微珠作为基底时，当微珠尺寸减小时，HE增加，这归因于局部未补偿的CoO自旋的增加。
We demonstrated the fabrication of the isolated magnetic Co/CoO nanocap array by oxidating the single Co layer which was deposited onto the two dimensional polystyrene sphere array. Compared to the continuous film and thicker nanocap structure,HEandHCof the 15 nm Co/CoO isolated cap array were enhanced significantly and were about 4 times as those of the corresponding continuous film, which was ascribed to the formation of the isolated magnetic single domain state due to the magnetic limit around the cap brim after the oxidation treatment. When the beads of the different sizes were used as the substrate,HEincreased when the bead size decreased, which was ascribed to the increase of the localized uncompensated CoO spins.
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