Local spin ice order induced planar Hall effect in Nd-Sn artificial honeycomb lattice

TL;DR

This study investigates the planar Hall effect in Nd-Sn artificial honeycomb spin ice, revealing temperature-dependent Hall signal enhancements linked to magnetic configurations and field-induced coupling.

Contribution

It demonstrates the emergence of a planar Hall effect in artificial spin ice, highlighting the role of magnetic moment configurations and low-field coupling effects.

Findings

Enhanced Hall signal at ~20 K due to spin ice state

Field-induced Hall resistivity increase at low temperatures

Identification of planar Hall effect in artificial honeycomb lattice

Abstract

Geometrically frustrated materials, such as spin ice or kagome lattice, are known to exhibit exotic Hall effect phenomena due to spin chirality. We explore Hall effect mechanism in an artificial honeycomb spin ice of Nd--Sn element using Hall probe and polarized neutron reflectivity measurements. In an interesting observation, a strong enhancement in Hall signal at relatively higher temperature of $T$ $\sim$ 20 K is detected. The effect is attributed to the planar Hall effect due to magnetic moment configuration in spin ice state in low field application. In the antiferromagnetic state of neodymium at low temperature, applied field induced coupling between atomic Nd moments and conduction electrons in underlying lattice causes distinct increment in Hall resistivity at very modest field of $H$ $\sim$ 0.015 T. The experimental findings suggest the development of a new research vista to study the planar and the field induced Hall effects in artificial spin ice.