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Magnetic Viscosity in Platinum Cobalt

Magnetic Viscosity in Platinum Cobalt Research Notes BY A. W. SIMPSON AND R. H. TREDGOLD Department of Physics, University of Nottingham MS. received 13th May 1953 ETAI L ED studies of the phenomena of magnetic viscosity have recently been made by various workers. In particular it has been shown that D in the majority of ferromagnetic materials the magnetization, immediately after the application of a discontinuous change in the applied field, follows a law of the form I = S log t + const. ...... (1) where t is the time measured from the instant of the change in field and S is a parameter characteristic of the crystallographic and magnetic state cf the material under consideration. Street and Woolley (1949) showed that this law can be explained in terms of an activation energy model if certain plausible assumptions are made, and Street, Woolley and Smith (1952) showed with Alnico I1 (Fe 54, Ni 18, CO 12, A1 10, Cu 6% by weight) that for a particular crystallographic state of the material the activation energy and applied field are related by 6E=-8H ...... (2) kT where 6H is a small increment in effective field and 6E is the corresponding mean change of activation energies; http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Proceedings of the Physical Society Section B IOP Publishing

Magnetic Viscosity in Platinum Cobalt

Proceedings of the Physical Society Section B , Volume 66 (9) – Sep 1, 1953
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Copyright
Copyright © IOP Publishing Ltd
ISSN
0370-1301
DOI
10.1088/0370-1301/66/9/411
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Abstract

Research Notes BY A. W. SIMPSON AND R. H. TREDGOLD Department of Physics, University of Nottingham MS. received 13th May 1953 ETAI L ED studies of the phenomena of magnetic viscosity have recently been made by various workers. In particular it has been shown that D in the majority of ferromagnetic materials the magnetization, immediately after the application of a discontinuous change in the applied field, follows a law of the form I = S log t + const. ...... (1) where t is the time measured from the instant of the change in field and S is a parameter characteristic of the crystallographic and magnetic state cf the material under consideration. Street and Woolley (1949) showed that this law can be explained in terms of an activation energy model if certain plausible assumptions are made, and Street, Woolley and Smith (1952) showed with Alnico I1 (Fe 54, Ni 18, CO 12, A1 10, Cu 6% by weight) that for a particular crystallographic state of the material the activation energy and applied field are related by 6E=-8H ...... (2) kT where 6H is a small increment in effective field and 6E is the corresponding mean change of activation energies;

Journal

Proceedings of the Physical Society Section B – IOP Publishing

Published: Sep 1, 1953

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