Tuning the magnetic properties of high aligned strontium ferrite nanowires formed in alumina template
Tuning the magnetic properties of high aligned strontium ferrite nanowires formed in alumina template
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DOI：
10.1016/j.jallcom.2015.09.245
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发表时间：
2016-01
影响因子：
6.2
通讯作者：
F. Ebrahimi;F. Ashrafizadeh;S. Bakhshi
中科院分区：
文献类型：
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作者：
F. Ebrahimi;F. Ashrafizadeh;S. Bakhshi
采用浸渍法在氧化铝模板中制备了有序的六方锶铁氧体纳米线阵列，研究了纳米线的直径和长度对高取向纳米线阵列磁性能的影响。在高纵横比下合成的纳米线的直径从30 nm改变到60 nm，同时保持它们之间的中心到中心距离相同。采用X射线衍射仪（XRD）、场发射扫描电子显微镜（FESEM）和能谱仪（EDS）对样品进行了表征。用超导量子干涉仪测量了纳米线的磁性能，得到了平行和垂直于线轴的磁场下的磁滞回线。纳米线阵列的磁性也被调查作为温度的函数。结果表明，导电率和矩形度均随丝长的增加而增加，而在中心距不变的情况下，导电率随直径的增加而减小。直径为30 ± 4 nm、长度为15 ± 0.01 μm的纳米线阵列实现了平行各向异性。锶纳米线的磁化模式是卷曲的。
Ordered hexagonal array of strontium ferrite nanowires were fabricated by dip coating in alumina templates and the influence of diameter and length on the magnetic properties of high aligned nanowire arrays were studied. The diameter of nanowires, synthesized in high aspect ratios, was changed from 30 to 60 nm while maintaining the same center to center distance between them. The samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray spectrum (EDS). Magnetic properties of nanowires were measured by a SQUID; the hysteresis loops were obtained with the applied magnetic field parallel and perpendicular to the wire axis. Magnetic properties of nanowire arrays were also investigated as a function of temperature. The Results showed that both coercivity and squareness increased with increasing wire length, while for constant center-to-center distance, coercivity decreased with increasing the diameter. Parallel anisotropy was achieved for 30 ± 4 nm diameter nanowire array having 15 ± 0.01 μm length. A curling mode of magnetization was suggested in strontium nanowires.