Mechanism of magnetic diode in artificial honeycomb lattice

TL;DR

This paper demonstrates a magnetic diode effect in artificial honeycomb lattices made of concave permalloy elements, revealing a new spintronic mechanism based on magnetic charge interactions effective across a broad temperature range.

Contribution

It introduces a novel magnetic diode mechanism driven by magnetic charge interactions in artificial honeycomb structures, expanding the understanding of spintronic phenomena beyond traditional spin-charge interactions.

Findings

Magnetic diode behavior observed from 40K to 300K.

Asymmetric magnetization due to magnetic charge distribution.

High multiplicity magnetic units increase electrical resistance.

Abstract

Spin diode is important prerequisite to practical manifestation of spin electronics. Yet, a functioning magnetic diode at room temperature is still illusive. Here, we reveal diode-type phenomena due to magnetic charge mediated conduction in artificial honeycomb geometry, made of concave shape single domain permalloy element. We find that honeycomb lattice defies symmetry by populating vertices with low and high multiplicity magnetic charges, causing asymmetric magnetization, in applied current of opposite polarity. High multiplicity units create highly resistive network, thereby inhibiting magnetic charge dynamics propelled electrical conduction. However, practical realization of this effect requires modest demagnetization factor in constituting element. Concave structure fulfills the condition. Subsequently, magnetic diode behavior emerges across broad thermal range of $T$ = 40K - 300K. The finding is a departure from the prevailing notion of spin-charge interaction as the sole guiding principle behind spintronics. Consequently, a new vista, mediated by magnetic charge interaction, is envisaged for spintronic research