Micromagnetic simulation of transverse biased initial susceptibility measurements

• Published in: Physica. B, Condensed matter Vol. 299; no. 3; pp. 205 - 214
• Main Authors: Aranda, G.R, Chubykalo, O.A, González, J, González, J.M, Lengsfield, B
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2001; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic anisotropy; Magnetic properties and materials; Magnetic properties of monolayers and thin films; Magnetic properties of surface, thin films and multilayers; Micromagnetism; Physics; Stray field; Thin films; Transverse susceptibility; Thin films; Micromagnetism; Transverse susceptibility; Magnetic anisotropy; Stray field; 75.70.Ak; 75.50.Kj; 75.30.Gw; 75.30.Cr; Effective field approximation; Finite element method; Theoretical study; Magnetic hysteresis; Exchange interactions; Boundary element method; Saturation magnetization; Magnetic susceptibility
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/S0921-4526(01)00467-7

By means of the hybrid finite element–boundary element method (FEM–BEM) formulated by T.R. Koehler and D.R. Fredkin, we have simulated transverse biased initial susceptibility (TBIS) experiments in various thin film systems. We have varied system size, anisotropy constant, exchange constant and saturation magnetization value. According to the theory developed by Hoffmann, the TBIS measurements provide the values for two fields, the effective anisotropy field and the so-called dispersion field. In the present paper we explore the limits of the validity of TBIS experiments. Our simulations clearly show a good agreement between the anisotropy field obtained by means of the Hoffmann's theory (according to TBIS experiments) and the average anisotropy field for all studied systems. The relation of the Hoffmann's dispersion field with other different fields, calculated from the equilibrium moment configuration, as well as with microstructural characteristic features of the system has also been analysed.