Search

We present measurements of the small-field magnetic response of non-oriented 1.8 wt% SiFe and rapidly-quenched 6.5 wt% SiFe as a function of various magnetic histories. The first part of the return branch originating from a given turning point ([H.sub.0],[B.sub.0]) was fitted by the quadratic law B - [B.sub.0] = [[micron].sub.rev] (H - [H.sub.0]) [+ or -] (b/2) [(H - [H.sub.0]).sup.2] and the dependence of [[micro].sub.rev] and b on ([H.sub.0],[B.sub.0]) and magnetic history was studied. [[micro].sub.rev] and b approximately follow the laws [[micro].sub.rev] [varies as] [1 - [([B.sub.0]/[B.sub.m]).sup.2]] + const, b [varies as] [1 - [the absolute value of][B.sub.0]/[B.sub.m]], [[micro].sub.rev] [varies as] exp[-[[H.sub.0].sup.2]/2[[[Sigma].sub.[micro]].sup.2] + const, and b [varies as] exp[-[[H.sub.0].sup.2]/2[[[Sigma].sub.[micro]].sup.2].