Temperature-dependent collective magnetization reversal in a network of ferromagnetic nanowires

Sergi Lendínez,Valentyn Novosad,M Benjamin Jungfleisch,John E Pearson,Axel Hoffmann

doi:10.1063/9.0000170

Abstract

The collective behavior of geometrically frustrated magnetization in connected networks of ferromagnetic nanowires, known as artificial spin ice, leads to complex magnetotransport behavior in those structures. Here, we present temperature- and current-dependent magnetotransport studies on a connected square artificial spin-ice system and correlate our observations to micromagnetic simulations. We find that the field at which the lattice magnetization collectively switches increases as the temperature is lowered. Our experimental findings highlight the importance of the global and local temperatures for the onset of a collective magnetization reversal in the connected system. These studies may also provide useful insights into novel storage concepts and applications in neuromorphic computing.

Highlights

Many modern technologies and sciences rely on steady advances in nanofabrication techniques
We find that the magnitude of the switching field increases when the temperature is lowered and as the temperature is increased the magnitude of the collective magnetization reversal field decreases
This general observation is in agreement with earlier reports,11,15 where the sharp features in the magnetoresistance were explained by a collective magnetization reversal

Summary

Introduction

Many modern technologies and sciences rely on steady advances in nanofabrication techniques. Nanofabrication has propelled the development of metamaterials, which are artificial materials with properties not usually found in nature. Towards this end, artificial spin ice (ASI) networks are nanofabricated magnetic materials, in which the magnetic material is modulated in space. The main driver for the exploration of ASI is the discovery of lattice frustration, emergence of magnetic monopoles, as well as exotic phases, complex magnetic ordering, and collective behavior.. The main driver for the exploration of ASI is the discovery of lattice frustration, emergence of magnetic monopoles, as well as exotic phases, complex magnetic ordering, and collective behavior.5 Owing to those properties, ASI are of interest to both fundamental research and applied sciences on equal footing.. The main driver for the exploration of ASI is the discovery of lattice frustration, emergence of magnetic monopoles, as well as exotic phases, complex magnetic ordering, and collective behavior. Owing to those properties, ASI are of interest to both fundamental research and applied sciences on equal footing. For instance, ASI networks can provide a pathway for new concepts in storage media and neuromorphic computing.

Results

Discussion

Conclusion