Microwave electromagnetic and absorption properties of Nd2Fe14B/alpha-Fe nanocomposites in the 0.5-18 and 26.5-40 GHz ranges

TitleMicrowave electromagnetic and absorption properties of Nd2Fe14B/alpha-Fe nanocomposites in the 0.5-18 and 26.5-40 GHz ranges
Publication TypeJournal Article
Year of Publication2007
AuthorsLian LX, Deng LJ, Han M, Tang W, Feng SD
Journal TitleJournal of Applied Physics
Volume101
Pages09M520
Date PublishedMay
Type of ArticleProceedings Paper
ISBN Number0021-8979
Accession NumberISI:000246567900424
KeywordsFERRITE, frequencies, MAGNETS
Abstract

Nd2Fe14B/alpha-Fe nanocomposites were prepared using a melt-spinning method, subsequent annealing treatment, and ball milling. The complex permittivity and permeability of the composites were measured in the 0.5-18 and 26.5-40 GHz frequency ranges. The permeability spectra of the Nd2Fe14B/alpha-Fe nanocomposites exhibit relaxation and resonance type characteristic in the 0.5-18 and 26.5-40 GHz frequency ranges, respectively. The resonance frequency (f(r)) of Nd10Fe78Co5Zr1B6 nanocomposite is 30 GHz due to the large anisotropy field (H-A). However, the resonance frequency of the Nd2Fe14B/alpha-Fe sample is lower than that of Nd2Fe14B, due to the decrease of H-A induced by the exchange interaction between hard and soft magnetic phases. These samples also showed good microwave absorption performance (reflection loss: <-20 dB) in 9, 17, and 35-38 GHz with matching thicknesses of 2, 1.2, and 0.37 mm, respectively. Therefore, Nd2Fe14B/alpha-Fe nanocomposites are thought to be a potential candidate for thinner microwave absorbers not only in the centimeter wave but also in the millimeter wave band. (c) 2007 American Institute of Physics.

DOI10.1063/1.2712957
Alternate JournalJ. Appl. Phys.