Structural and angular dependence of coercivity and magnetic remanence of electrochemical ferromagnetic nanowires

TL;DR

This study investigates how the diameter of electrochemically grown ferromagnetic nanowires influences their magnetic coercivity and remanence, revealing diameter-dependent magnetic behaviors and reversal mechanisms.

Contribution

It introduces a method to control nanowire magnetic properties via pore diameter and demonstrates the diameter's impact on magnetic reversal mechanisms through combined theory and experiments.

Findings

Stray fields depend on nanowire diameter.

Reversal mechanism crossover occurs with diameter change.

Four diameter ranges control magnetization orientation.

Abstract

A novel method for controlling nanowire magnetic properties and growth from filling time profile is presented. The wires are grown with an electrodeposition method ("Template synthesis") with a wide selection of pore diameters. We show that stray-fields presence in ferromagnetic nanowires are entirely dependent on the nanowire diameter. Besides a crossover effect in the reversal mechanism is observed with change in diameter. In this work, theory and experiment agree and confirm that according to the variety of hysteresis loop measured, about four ranges of values of pore diameter control the orientation of nanowire magnetization easy axis with respect to the geometrical axis.