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Percolation Structure Observed in Evaporated Nd-Fe-B Films

Published online by Cambridge University Press:  21 February 2011

C.H. Shang ,
B.X. Liu  and
H.D. Li
C.H. Shang
Affiliation:
Department of Materials Science and Engineering, Tsinghua University Beijing 100084, P.R. CHINA
B.X. Liu
Affiliation:
also at Center of Condensed Matter and Radiation Physics, CCAST(World Lab.) Beijing, P.R. CHINA
H.D. Li
Affiliation:
Department of Materials Science and Engineering, Tsinghua University Beijing 100084, P.R. CHINA
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Abstract

Thin alloy films were prepared by evaporating a standard magnetic Nd2Fe14B ingot in a high vacuum e-gun system at roam temperature. The as-deposited films of 50 nm thick were characterized by transmission electron microscopy (TEM) and in situ energy dispersive spectroscopy (EDS). Bright field examination showed that a novel morphology with holes of varied sizes emerged in the films. The hole-like white areas enriched with Nd, and the dark network with Fe. The electron micrograph was digitized by an VAX image processor. An infinite cluster was proved to be a two-dimensional percolating structure at the percolation threshold. The fractal dimension and the percolation threshold were calculated to be 1.90±0.04 and 0.60±0.04, respectively, which are in good consonance with the theoretical predictions. The as-deposited samples were aged at roam temperature for about two months. Enhanced diffusion and solid state reaction induced another percolating networks camposed essentially by Fe7Nd and Nd-riched solid solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 187: Symposium J – Thin Film Structures and Phase Stability , 1990 , 127
Copyright
Copyright © Materials Research Society 1990

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