Abstract Arrays of amorphous CoFeB nanowires with the diameter of 250 nm and length of 20 μm were fabricated by electrodepositing in pores of anodic aluminum oxide (AAO) templates. The corresponding changes of coercivity (Hc), remanence squareness (Mr/Ms), and the shape of hysteresis loops of NWs before and after annealing with the microstructure evolution have been investigated. The XRD and TEM results showed the precipitation of partial Co nanocrystallites and complete crystallization for the annealing treatment at 573 K and 773 K, respectively. The VSM results indicated a strong magnetic anisotropy in the amorphous nanowires and the easy magnetization axis was in perpendicular to the long wire axis. Both Hc and Mr/Ms increased with increasing annealing temperature. The magnetization reversal process occurred by the curling model for the amorphous nanowires and exhibited a transition for magnetization reversal after thermal annealing. In all, the magnetic properties of CoFeB nanowires can be controlled by tuning their microstructure with thermal annealing.

中文翻译：

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CoFeB纳米线磁性能的微观结构和相位依赖性

摘要 通过在阳极氧化铝 (AAO) 模板的孔隙中电沉积制备了直径为 250 nm、长度为 20 μm 的非晶 CoFeB 纳米线阵列。研究了退火前后 NWs 的矫顽力 (Hc)、剩磁矩形度 (Mr/Ms) 和磁滞回线形状随微观结构演变的相应变化。XRD 和 TEM 结果表明，分别在 573 K 和 773 K 下进行退火处理，部分 Co 纳米晶析出和完全结晶。VSM 结果表明非晶纳米线具有很强的磁各向异性，易磁化轴垂直于长线轴。Hc 和 Mr/Ms 都随着退火温度的升高而增加。非晶纳米线的卷曲模型发生了磁化反转过程，并在热退火后表现出磁化反转的转变。总之，CoFeB 纳米线的磁性能可以通过用热退火调整其微观结构来控制。