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

doi:10.1088/1674-1056/24/4/047503

Abstract

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 (α_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 α_eff with x was analyzed in detail.

Keywords: soft magnetic properties high frequency properties damping factor granular film

Received: 19 October 2014
Revised: 25 November 2014
Accepted manuscript online:

PACS:	75.70.Ak	(Magnetic properties of monolayers and thin films)
	75.30.Gw	(Magnetic anisotropy)
	75.78.-n	(Magnetization dynamics)
	75.50.Bb	(Fe and its alloys)

Fund:

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

Corresponding Authors: Yao Dong-Sheng
E-mail: yaodsh@tju.edu.cn

Cite this article:

Li Wen-Chun (李文春), Zuo Ya-Lu (左亚路), Liu Xiao-Hong (刘晓虹), Wei Qing-Qing (魏清清), Zhou Xue-Yun (周雪云), Yao Dong-Sheng (姚东升) High frequency characteristics of (Ni₇₅Fe₂)_x(ZnO)_1-x granular thin films with tunable damping coefficient 2015 Chin. Phys. B 24 047503

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

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High frequency characteristics of (Ni₇₅Fe₂)_x(ZnO)_1-x granular thin films with tunable damping coefficient