High frequency characteristics of (Ni75Fe2) (ZnO)1- granular thin films with tunable damping coefficient

• 作者: 刘晓虹 周雪云 姚东升 左亚路 李文春 魏清清
• 来源期刊: 中国物理B（英文版）
• 关键词: soft magnetic properties high frequency properties damping factor granular film
• 年，卷（期）: 2015,（4）
• 页码范围: 047503-1-047503-4
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/4/047503

摘要

The effect of the volume fraction of ferromagnetic metal (x) in (Ni75Fe25)x(ZnO)1?x nanogranular thin films on mi-crostructural, 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 (αeff) from 0.023 to 0.043 were achieved by decreasing x from 0.82 to 0.55. Combined with the HRTEM results, the variation ofαeff with x was analyzed in detail.