High frequency characteristics of (Ni_(75)Fe_2)_x(Zn O)_(1-x) granular thin films with tunable damping coefficient

作     者：李文春 左亚路 刘晓虹 魏清清 周雪云 姚东升 Li Wen-Chun;Zuo Ya-Lu;Liu Xiao-Hong;Wei Qing-Qing;Zhou Xue-Yun;Yao Dong-Sheng

作者机构：Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology Faculty of ScienceTianjin University The Key Laboratory for Magnetism and Magnetic Materials Lanzhou University Faculty of Science Jiujiang University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2015年第24卷第4期

页      面：441-444页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.50901050 and 51101079) 

主　　题：soft magnetic properties high frequency properties damping factor granular film 

摘      要：The effect of the volume fraction of ferromagnetic metal （x） in （Ni75Fe25）x（ZnO）1-x nanogranular thin films on microstructural, soft-magnetic, and high-frequency properties was investigated. Good soft-magnetic properties were obtained in a broad x range, with 0.55 〈 x 〈 0.82. High resolution transmission electron microscopy （HRTEM） observations reveal that the grain size of the samples is lower than 14 nm, and that it decreases with decreasing x. Of special interest, our investigation of the permeability spectra indicates that these films exhibit an adjustable frequency linewidth of resonance peak, dependant upon changing x. Correspondingly, large and adjustable damping coefficients （aeff） from 0.023 to 0.043 were achieved by decreasing x from 0.82 to 0.55. Combined with the HRTEM results, the variation of αeff with x was analyzed in detail.