High frequency characteristics of (Ni sub(75)Fe sub(2)) sub(x)(ZnO) sub(1-x) granular thin films with tunable damping coefficient

The effect of the volume fraction of ferromagnetic metal (x) in (Ni sub(75)Fe sub(25)) sub(x)(ZnO) sub(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 <...

Full description

Saved in:
Bibliographic Details
Published in:Chinese physics B 2015-04, Vol.24 (4), p.047503-1-047503-4
Main Authors: Li, Wen-Chun, Zuo, Ya-Lu, Liu, Xiao-Hong, Wei, Qing-Qing, Zhou, Xue-Yun, Yao, Dong-Sheng
Format: Article
Language:English
Subjects:
Adjustable
Coefficients
Damping
Ferromagnetic materials
Grain size
High frequencies
Nanostructure
Thin films
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effect of the volume fraction of ferromagnetic metal (x) in (Ni sub(75)Fe sub(25)) sub(x)(ZnO) sub(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 ( alpha sub(eff)) 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 alpha sub(eff) with x was analyzed in detail.
ISSN:1674-1056
1741-4199
DOI:10.1088/1674-1056/24/4/047503