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采用直流磁控溅射方法在玻璃基底上制备了不同Fe掺杂浓度的TiO_2薄膜,并对其晶体结构和磁特性进行了研究.在所有掺杂样品中,均观察到了室温铁磁性,磁性源于Fe离子与其近邻空间分布的空穴相互作用.在掺杂量为7%的锐钛矿相薄膜中观察到了最大的磁化强度.随着Fe掺杂浓度的进一步增加,TiO_2的晶体结构逐渐由锐钛矿相向金红石相转变,并且磁性减弱.不同结构的TiO_2中Ti-O键长不同,导致替代的磁性Fe离子与空穴的作用强度发生改变,进而使其磁性发生变化.
The films with different Fe doping concentrations were prepared on a glass substrate by direct current magnetron sputtering and the crystal structure and magnetic properties of the films were studied.All the samples were observed at room temperature ferromagnetism, magnetic source The interaction between Fe ions and holes distributed in the adjacent space was observed. The maximum magnetization was observed in the anatase phase thin films with 7% doping concentration. With the further increase of Fe doping concentration, the crystal structure of TiO_2 gradually changed from The anatase phase changes toward rutile phase and the magnetic properties are weakened.The Ti-O bond lengths in different structures of TiO 2 are different, resulting in the change of the magnetic intensity between the alternative magnetic Fe ions and the holes.