Magnetically induced anisotropy in amorphous alloys of Fe-Ni-P-B

• Published in: IEEE transactions on magnetics Vol. 13; no. 5; pp. 1635 - 1638
• Main Authors: Luborsky, F., Walter, J.
• Format: Journal Article
• Language: English
• Published: IEEE 01.09.1977
• Subjects: Amorphous magnetic materials; Amorphous materials; Anisotropic magnetoresistance; Annealing; Iron alloys; Kinetic theory; Magnetic anisotropy; Nickel alloys; Perpendicular magnetic anisotropy; Temperature dependence
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.1977.1059655

The uniaxial magnetic anisotropy K u induced during magnetic annealing has been determined for a series of amorphous alloys of the formula (Fe y Ni 1-y ) 80 P 14 B 6 . In contrast to the (Fe, Ni) 80 B 20 amorphous alloys previously reported, K u in the present alloys has neither the composition dependence nor the temperature dependence predicted from simple pair order theory. The results strongly suggest the presence of a large contribution to the directional order anisotropy from the metalloids in the iron-rich amorphous alloys. The dependence of the uniaxial induced anisotropy on decreasing iron concentration can be accounted for by a decreasing contribution from the metalloids. A discrepancy in the temperature dependence of K u at high anneal temperatures is attributed to the experimental problem of too slow a quench from the anneal temperature, compared to the rather fast kinetics of equilibration at temperatures below the anneal temperature.