Evidence for Two-Dimensional Spin-Glass Ordering in Submonolayer Fe Films on Cleaved InAs Surfaces

TL;DR

This study provides evidence of two-dimensional spin-glass ordering in submonolayer Fe films on InAs surfaces, demonstrated through magnetotransport measurements showing hysteresis, remanence differences, and relaxation phenomena at low temperature.

Contribution

The paper presents experimental evidence of 2D spin-glass behavior in Fe films on InAs, highlighting unique magnetic properties at the atomic scale.

Findings

Hysteresis observed in magnetoresistance

Remanent magnetoresistance varies with cooling procedures

Logarithmic relaxation occurs after magnetic field sweep

Abstract

Magnetotransport measurements have been performed on two-dimensional electron gases formed at InAs(110) surfaces covered with a submonolayer of Fe. Hysteresis in the magnetoresistance, a difference in remanent magnetoresistance between zero-field-cooling procedures and field-cooling procedures, and logarithmic time-dependent relaxation after magnetic field sweep are clearly observed at 1.7 K for a coverage of 0.42 monolayer. These features are associated with spin-glass ordering in the Fe film.