Origins of coercivity in the amorphous alloy Nd-Fe-Al

Author

Kramer, M.J. ; O´Connor, A.S. ; Dennis, K.W. ; McCallum, R.W. ; Lewis, L.H. ; Tung, L.D. ; Duong, N.P.

Author_Institution

Ames Lab., Iowa State Univ., Ames, IA, USA

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

2497

Lastpage

2499

Abstract

Results obtained from detailed studies of the microstructure and devitrification behavior, as revealed by advanced electron microscopy and synchrotron x-ray diffraction techniques, were compared with magnetic and thermal analysis characterization to obtain insight into the appreciable coercivity of nominally-amorphous melt-spun ribbon of Nd _60-2/3xFe_30-1/3xAl_10+x(-2<×<6.5). The as-spun microstructure consists of an amorphous Nd-rich, magnetically-soft matrix with clusters of approximate 1.2 nm diameter that apparently confer the hard magnetic properties to the alloy. The clusters are tentatively identified as sub-unit-cells of Nd₆Fe_13-xAl_1+x, by virtue of their unique and analogous temperature-dependent magnetic character as well as considerations of the ternary phase relationships during solidification

Keywords

X-ray diffraction; aluminium alloys; amorphous magnetic materials; coercive force; electron microscopy; ferromagnetic materials; iron alloys; melt spinning; metallic glasses; neodymium alloys; solidification; Nd-Fe-Al; Nd-Fe-Al amorphous alloy; cluster microstructure; coercivity; devitrification; electron microscopy; hard magnetic properties; magnetic analysis; melt spun ribbon; metallic glass; solidification; synchrotron X-ray diffraction; temperature dependence; thermal analysis; Amorphous magnetic materials; Amorphous materials; Coercive force; Electron microscopy; Iron; Magnetic force microscopy; Microstructure; Neodymium; Synchrotrons; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.951214

Filename

951214