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The Initial Susceptibility of Cobalt after Electron Irradiation at 4.2 K
Author(s) -
Schaefer H. E.,
Dander W.
Publication year - 1976
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.2220750117
Subject(s) - electrical resistivity and conductivity , dumbbell , magnetic susceptibility , basal plane , anisotropy , cobalt , condensed matter physics , ferromagnetism , irradiation , materials science , atom (system on chip) , electron beam processing , electron , hexagonal crystal system , crystallography , chemistry , physics , metallurgy , medicine , physical therapy , quantum mechanics , computer science , nuclear physics , embedded system
Abstract After electron irradiation at 4.2 K the initial ferromagnetic susceptibility of cobalt shows a marked decrease (“susceptibility dip”) of about 50% when the specimen is annealed between 20 and 30 K and regains its initial value in recovery stage I c of the electrical resistivity between 40 and 50 K. Similar, yet smaller “susceptibility dips” are observed at 5, 55, 70, and 150 K. The 30 K decrease of the initial susceptibility is tentatively ascribed to the pinning of domain walls by interstitial atoms of hexagonal symmetry in the [0001]‐dumbbell configuration which, however, may be stable only under the influence of close Frenkel pairs in their neighbourhood. This model is in good agreement with simultaneous electrical resistivity and magnetic after‐effect measurements reported elsewhere which indicate that the anisotropy axis of the freely migrating interstitial atom has a component parallel to the basal plane.