Conditions for infinite reversible susceptibility as magnetic systems reach irreversible switching

• Published in: Journal of magnetism and magnetic materials Vol. 247; no. 3; pp. 279 - 295
• Main Authors: Bertram, H.N, Liu, A.D
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-06-2002; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Domain effects, magnetization curves, and hysteresis; Eigenmodes; Exact sciences and technology; Irreversible switching; Magnetic hysteresis; Magnetic properties and materials; Magnetization curves, hysteresis, Barkhausen and related effects; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Micromagnetics; Physics; Reversible susceptibility; 75.60.Ej; Eigenmodes; Irreversible switching; Magnetic hysteresis; Reversible susceptibility; 75.60.Jk; Micromagnetics; Irreversible processes; Micromagnetism; Magnetization; Phase transformations; Eigenmode; Switching; Magnetic susceptibility
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(02)00279-2

The reversible susceptibility approaching a magnetization phase transition corresponding to irreversible switching is examined both analytically and numerically. It is shown that the reversible susceptibility becomes infinite at switching if the reversible rotation just prior to irreversible motion has a component in the switching direction. For the numerical examples of non-uniform processes, as well as analytic analysis of two interacting grains, infinite susceptibility is seen only if the prior reversible rotation is virtually entirely along the subsequent reversal direction.