Title :
Amorphous magnetic RE-Fe-Al alloys
Author :
Kong, Hui Zi ; Ding, Jun ; Wang, Lan ; Li, Yi
Author_Institution :
Dept. of Mater. Sci., Nat. Univ. of Singapore, Singapore
fDate :
7/1/2001 12:00:00 AM
Abstract :
Detail studies of the effects of rare-earth substitution on the magnetic properties of bulk amorphous hard magnetic Nd60Fe 30Al10 alloys were carried out. Amorphous ribbons of alloys RE60Fe30Al10 (with RE=Nd,Sm,Gd and Dy) were prepared by melt-spinning at 30 m/s. As temperature increases, instead of just a simple transition from ferromagnetic state to paramagnetic state, these ribbons undergo a superparamagnetic stage that ranges over about 100 K. Ribbons of alloys RE60Fe30Al10 with RE=Nd,Sm and Dy exhibit high values of coercivity (in MA/m) range at 4 K, while coercivity of ribbons of alloys with RE=Y and Gd remain low below 100 kA/m
Keywords :
aluminium alloys; amorphous magnetic materials; coercive force; ferromagnetic materials; ferromagnetic-paramagnetic transitions; iron alloys; melt spinning; metallic glasses; rare earth alloys; superparamagnetism; Dy60Fe30Al10; Gd60Fe30Al10; Nd60Fe30Al10; Sm60Fe30Al10; amorphous alloy ribbon; cluster ferromagnetism; coercivity; ferromagnetic-paramagnetic transition; hard magnetic properties; melt spinning; rare earth substitution; superparamagnetism; Aluminum alloys; Amorphous magnetic materials; Amorphous materials; Iron alloys; Magnetic anisotropy; Magnetooptic recording; Neodymium; Perpendicular magnetic recording; Samarium alloys; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
