Surface crystallization and magnetic properties of amorphous Fe{sub 80}B{sub 20} alloy
- Istituto Nazionale di Fisica della Materia-Dipartimento di Fisica, Universita di Ferrara, Via Paradiso 12, I-44100 Ferrara (Italy)
- Istituto Nazionale di Fisica della Materia-Dipartimento di Fisica, Politecnico di Milano, P.zza L. da Vinci 32, I-20133 Milano (Italy)
We have studied the effects of surface crystallization on the magnetic properties of Fe{sub 80}B{sub 20} amorphous alloys. The surface magnetic properties have been studied with magneto-optic Kerr measurements, while those of bulk with a vibrating sample magnetometer. This study reveals that surface crystallization is similar to the bulk process but occurs at a lower temperature. At variance with previous results on other iron-based amorphous alloys the surface crystalline layer does not induce bulk magnetic hardening. Furthermore, both the remanence to saturation ratio and the bulk magnetic anisotropy do not show appreciable variations after the formation of the surface crystalline layer. The Curie temperature of the surface layer is lower with respect to the bulk of the sample. These effects can be explained by a lower boron concentration in the surface region of the as-cast amorphous alloy. Measurements of the chemical composition confirm a reduction of boron concentration in the surface region. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 550454
- Journal Information:
- Journal of Applied Physics, Vol. 82, Issue 12; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magneto-optical study of uranium additions to amorphous Tb/sub x/Fe/sub 1-//sub x/
From superconductivity to ferromagnetism in amorphous Gd--La--Au alloys. [(La/sub 100-x/Gd/sub x/)/sub 80/Au/sub 20/, x = 0 to 100, 1. 7 to 300/sup 0/K]