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The Magnetic and Structural Properties of Bulk Amorphous and Crystalline Co‐P Alloys
Author(s) -
Simpson A. W.,
Brambley D. R.
Publication year - 1971
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220430130
Subject(s) - materials science , amorphous solid , annealing (glass) , coercivity , magnetocrystalline anisotropy , orthorhombic crystal system , magnetic susceptibility , crystallography , alloy , cobalt , magnetic anisotropy , magnetization , condensed matter physics , crystal structure , metallurgy , chemistry , magnetic field , physics , quantum mechanics
Bulk samples, of the order 0.2 mm thick, of cobalt‐phosphorus alloys have been prepared by prolonged electroless deposition with phosphorus contents varying from 5 to 9 at%. Alloys with less than 8.8 at% were found to be crystalline with a single‐phase h.c.p. structure, and those with 9 at% were amorphous. The saturation magnetization, magnetostriction, coercivity, and susceptibility of the crystalline alloys varied uniformly with phosphorus content. The amorphous alloys had significantly different magnetic properties from the crystalline ones of similar composition; in particular the susceptibility was nearly two orders of magnitude greater. This greater susceptibility was predominantly associated with the absence of magnetocrystalline anisotropy in the non‐crystalline material. On annealing, the amorphous material first transformed to a single‐phase h.c.p. structure similar to that of the crystalline alloys, and at a higher temperature to the equilibrium two‐phase structure of a cobalt‐rich h.c.p. phase and an orthorhombic Co 2 P phase. The susceptibility of the amorphous alloy fell by a factor of 15 times on annealing. This was attributed to the introduction of crystalline order and hence magneto‐crystalline anisotropy.