Exchange coupling and the grain boundary in magnetic nanocomposites

Author

O´Donnell, K. ; Rao, X.-L. ; Cullen, J.R. ; Coey, J.M.D.

Author_Institution

Dept. of Phys., Trinity Coll., Dublin, Ireland

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3886

Lastpage

3888

Abstract

The grain boundary phase/material found to be present in two-phase mechanically alloyed nanocomposites of Sm₂Fe₁₇N ₃/Fe and Nd₂Fe₁₄B/Fe was characterized using Mossbauer spectroscopy and magnetization measurements. The fraction of iron in this third component is typically 10-15% in Sm₂Fe₁₇N₃/Fe and 4-5% in Nd₂Fe₁₄B/Fe nanocomposites. The influence of the grain size of the nanocomposite and the grain boundary material on the susceptibility was studied and the results are discussed in terms of the model of Wang and Mills

Keywords

Mossbauer effect; boron alloys; composite materials; exchange interactions (electron); ferromagnetic materials; grain boundaries; grain size; iron; iron alloys; magnetic susceptibility; magnetisation; mechanical alloying; nanostructured materials; neodymium alloys; permanent magnets; samarium alloys; Mossbauer spectroscopy; Nd₂Fe₁₄B-Fe; Nd₂Fe₁₄B/Fe; Sm₂Fe₁₇N₃-Fe; Sm₂Fe₁₇N₃/Fe; exchange coupling; grain boundary; grain size; magnetic nanocomposites; magnetization; susceptibility; two-phase mechanically alloyed nanocomposites; Couplings; Grain boundaries; Iron alloys; Magnetic materials; Magnetization; Mechanical variables measurement; Nanocomposites; Neodymium; Samarium alloys; Spectroscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619604

Filename

619604