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The magnetic properties of Co-Ni-Fe films

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3 Author(s)
R. Lampert ; Univac, Division of the Sperry Rand Corporation, St. Paul, Minn ; J. Gorres ; M. Hanson

H_{k} , \delta H_{k} ,\alpha _{90} and Hchave been measured for vapor-deposited nonmagnetostrictive Co-Ni-Fe films, 1500 Å thick. All parameters except Hchave been measured using the transverse-biased permeability apparatus. Hkincreases linearly with cobalt melt content up to 15-percent cobalt, \delta H_{k} and Hcincrease with increasing cobalt and substrate temperature. α90decreases in the region 0-15-percent cobalt and then increases with increased cobalt melt content and substrate temperature. The coefficient of magnetoelastic composition sensitivity S is the slope of the curve η versus the ratio of nickel to iron in the melt for a constant cobalt percentage about the point \eta = 0 . The value of S increases rapidly with substrate temperature to a maximum near 300°C if the cobalt percentage is small. For larger amounts of cobalt S is reduced and is more independent of temperature. It is proposed that the volume fraction and the mobility of the grain boundaries in the film structure are primarily responsible for S .

Published in:

IEEE Transactions on Magnetics  (Volume:4 ,  Issue: 3 )