Magnetostatic interactions between two magnetic wires

¹  Dipartimento di Chimica IFM and NIS, Università di Torino - Via P. Giuria 9, 10125, Torino Italy
²  Instituto de Física Gleb Wataghin (IFGW), Universidade Estadual de Campinas - UNICAMP, C.P. 6165, Campinas 13083-970 SP, Brazil
³  Instituto de Física, Universidad Católica de Valparaíso - Casilla 4059, Valparaíso, Chile
⁴  Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile - Casilla 487-3, Santiago, Chile
⁵  Departamento de Física, Universidad Técnica Federico Santa María - Casilla 110V, Valparaíso, Chile
⁶  Max-Planck-Institute for Solid State Research - Heisenbergstrasse 1, D-70569 Stuttgart, Germany
⁷  Instituto de Ciencias de Materiales de Madrid, CSIC - Campus Cantoblanco, 28049 Madrid, Spain

Received: 26 January 2007
Accepted: 3 May 2007

Abstract

The results of the magnetic dipolar field in a simple set of two amorphous ferromagnetic wires of composition placed side by side are presented. Owing to their peculiar domain structure, they could, in principle, be approximated by macroscopic magnetic dipoles, allowing the analysis of the magnetostatic field between these magnetic entities. Magnetization measurements as a function of the distance between the parallel wires were performed. Results can be explained considering the magnetostatic field created by one wire in the neighboring one. It is clearly shown that this field is responsible for changes of the reversal field of the wires, leading to the appearance of plateaux during the demagnetization process. Instead of pure dipolar model that does not fit experimental data, a multipolar model has been developed, showing a rather good agreement with the experimental results.