Stochastic Magnetization Switching in Rapidly Solidified (Co0.94Fe0.06)72.5Si12.5B15 Amorphous Submicronic Wires.

Tibor-Adrian Óvári,Sorin Corodeanu,Horia Chiriac,Cristian Rotărescu,Costică Hlenschi,Nicoleta Lupu

doi:10.3390/ma15030896

Tibor-Adrian Óvári, Sorin Corodeanu + Show 4 more

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https://doi.org/10.3390/ma15030896

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Abstract

Submicrometric magnetic amorphous wires are good candidates for future development of miniaturized sensors and magnetic logic applications. Here we report the results of an in-depth investigation of magnetization switching in rapidly solidified nearly zero magnetostrictive (Co0.94Fe0.06)72.5Si12.5B15 amorphous samples with diameters of the actual magnetic wires between 300 and 450 nm. All samples were found to be magnetically bistable, displaying characteristic rectangular hysteresis loops. This shows that magnetization reversal occurs through the depinning and subsequent propagation of a magnetic domain wall, whose velocity depends on the applied field and on the sample dimensions. The results of this study reveal stochastic nonlinear dependencies of both the magnetic switching field and the domain wall velocity on the sample diameter. The analysis of the potential causes, which include nonlinear residual stresses, fluctuations in wire dimensions (metal and glass), and competing magnetic anisotropies of different origins, show that a combination of all three factors could lead to the observed stochastic behavior. Calculated values of the switching field, which consider only changes in the wire dimensions, indicate that such influence alone cannot account for the strong nonlinearities. The results are important for the applications of such ultrathin cylindrical magnetic amorphous wires.

Highlights

Rapid solidification has been used to prepare cylindrical wire-shaped amorphous metals since the 1970s [1]
The aim of this work is to perform an in-depth investigation of magnetization switching in rapidly solidified nearly zero magnetostrictive (Co0.94Fe0.06)72.5Si12.5B15 amorphous wires with diameters between 300 and 450 nm, prepared by an improved variant of the glass-coated melt spinning method
The mechanism of axial magnetization reversal consists in the depinning and subsequent propagation of a preexisting 180◦ magnetic domain wall

Summary

Introduction

Rapid solidification has been used to prepare cylindrical wire-shaped amorphous metals since the 1970s [1]. Rapid solidification has been employed to prepare and investigate submicronic amorphous wires [4,5] These materials offer important benefits in terms of miniaturization, as well as of new application opportunities for much needed state-ofthe-art purposes, such as micro and nano-sensing devices [6], medical applications [7,8,9], information technology engineering applications in magnetic logic devices [10], flexible electronics, various functional devices and smart structures [11]. They could be employed as key elements in miniaturized tunable metamaterials, adjustable microwave materials, as well as self-sensing micro and nanomaterials [12]

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