Synthesis and magnetic studies of pure and doped NiZn ferrite films using Sol gel method
Synthesis and magnetic studies of pure and doped NiZn ferrite films using Sol gel method
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DOI：
10.1016/j.matchemphys.2021.125357
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发表时间：
2021-10
影响因子：
4.6
通讯作者：
S. Kotru;R. Paul;J. A. Abu Qahouq
中科院分区：
文献类型：
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作者：
S. Kotru;R. Paul;J. A. Abu Qahouq
研究了钴、铜掺杂对镍锌铁氧体薄膜磁性能的影响。采用溶胶凝胶法制备了Ni0.5Cu0.5Fe2O4、Ni0.35Cu0.2Zn0.45Fe2O4和Ni0.35Co0.2Zn0.45Fe2O4三种不同成分的薄膜。这些薄膜在500℃、600℃、700℃和800℃的快速热退火炉中进行了热处理。X射线衍射证实了这些薄膜中形成了单相的尖晶石结构。用交流梯度磁强计测量了这些薄膜的饱和磁化强度(Ms)和矫顽力等磁性能。在600℃下退火后，薄膜的Ms值最大，分别为350、334和261emu/cm3。这些薄膜的对应的矫顽力分别为102、509和95Oe。因此，Co0.2掺杂增加了样品的矫顽力，而Cu0.2掺杂降低了样品的矫顽力。用扫描电子显微镜测量了样品的粒度分布。观察到在较高的退火温度(600℃以上)下，薄膜出现裂纹，导致薄膜的饱和磁化强度降低。
In this work, the effect of Co and Cu doping on the magnetic properties of Nickel Zinc ferrite films was investigated. Three types of films with composition Ni0.5Zn0.5Fe2O4,Ni0.35Cu0.2Zn0.45Fe2O4and Ni0.35Co0.2Zn0.45Fe2O4were prepared using the sol-gel method. These films were annealed at 500, 600, 700 and 800 °C using a rapid thermal annealing furnace. XRD diffraction confirmed the formation of single-phase spinel structure in these films. Magnetic properties such as saturation magnetization (Ms) and coercivity of these films were measured using an alternating gradient magnetometer. The highest values of Mswere obtained for films annealed at 600 °C which are 350, 334 and 261 emu/cm3for undoped, Co doped and Cu doped films, respectively. The corresponding coercivity values of these films were 102, 509 and 95 Oe. Thus, Co0.2doping resulted in an increase in the coercivity whereas Cu0.2doping reduced the coercivity. Grain size distribution was measured using a scanning electron microscope. It was observed that at higher annealing temperatures (above 600 °C), films developed cracks which results in the reduction of the saturation magnetization from such films.