Title :
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
fDate :
7/1/2001 12:00:00 AM
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 60-2/3xFe30-1/3xAl10+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 Nd6Fe13-xAl1+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;
Journal_Title :
Magnetics, IEEE Transactions on
