Magnetic Metastability driven Anomalous Hall Effect in Fe$_{x}$TaS$_2$

TL;DR

This study reports the discovery of thermoremanent magnetization and a large anomalous Hall effect in Fe$_{x}$TaS$_2$, driven by magnetic metastability and short-range correlations above the Curie temperature.

Contribution

It reveals the connection between magnetic metastability, thermoremanent magnetization, and anomalous Hall effect in Fe$_{x}$TaS$_2$, highlighting the role of short-range correlations and Ising spins.

Findings

Thermoremanent magnetization persists up to 160 K, above the Curie temperature.

Large anomalous Hall effect observed in zero magnetic field.

Short-range magnetic correlations exist above $T_C$, influencing magnetic properties.

Abstract

We report here the observation of robust thermoremanent magnetization (TRM) in Fe-intercalated TaS$_2$ single crystal Fe$_{x}$TaS$_2$, which develops upon cooling under a moderate magnetic field of 500 Oe or higher. The thermoremanence is found to exist in a zero magnetic field up to a temperature as high as 160 K, which is well above the ferromagnetic Curie point ($T_C =$ 90 K) of the sample. The TRM in this compound can be traced back to the strong Ising character and the quasi-two-dimensional nature of the spins. The analysis of the magnetization data indicates the presence of short-range magnetic correlation in the form of a Griffiths singularity above $T_C$ to a temperature as high as 2$T_C$. The TRM is further manifested in the form of a large anomalous Hall effect (AHE) in zero magnetic field. In contrast to TRM, which exists well above $T_C$, the thermoremanent Hall effect vanishes as soon as the sample is heated above $T_C$. This may be an indication that a long-range ordered phase is essential for the emergence of AHE.