title: On the significance of the area under the after-effect function curve of a magnetic fluid.
abstract: The after-effect function, b(t), describes how the magnetization of a dissipative magnetic fluid decreases with time when a polarizing field, H, is suddenly removed. It is shown that with increasing H, the rate of decay of b(t) increases and also that the area, [Formula: see text], under each decay curve decreases. Here we investigate the significance of this and by means of a simple model, show that the normalized function, B/b(0), is in fact equal to the Debye relaxation time τ(D). The results of applying the model to theoretically generated data and also to data obtained from a magnetic fluid sample are presented.
authors.affiliation: Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Republic of Ireland.
authors.forename: P C
authors.initials: PC
authors.lastname: Fannin
authors.forename: C N
authors.initials: CN
authors.lastname: Marin
authors.forename: C
authors.initials: C
authors.lastname: Couper