How do magnetic microwires interact magnetostatically?

TL;DR

This paper investigates the magnetostatic interactions between ferromagnetic microwires, combining theoretical calculations with experimental hysteresis measurements, to understand their effects and potential for technological applications like magnetic sensors.

Contribution

It provides a quantitative analysis of magnetostatic interactions in microwires and links these interactions to observable hysteresis features, aiding sensor design.

Findings

Magnetostatic interactions cause distinct features in hysteresis loops.

Theoretical calculations match experimental measurements.

Interaction forces can be easily derived from the model.

Abstract

The magnetostatic interaction between two ferromagnetic microwires is calculated as a function of their geometric parameters and compared with those measured through magnetic hysteresis loops of glass-coated amorphous Fe% $_{77.5}$Si$_{7.5}$B$_{15}$ microwires. The hysteresis loops are characterized by well-defined Barkhausen jumps corresponding each to the magnetization reversal of individual microwires, separated by horizontal plateaux. It is shown that the magnetostatic interaction between them is responsible for the appearance of these plateaux. Finally, using the expression for the magnetostatic interaction is trivial to obtain the interacting force between microwires. Our results are intended to provide guidelines for the use of these microwires with technological purpose such as the fabrication of magnetic sensors.