Anomalous Hall Effect and Magnetoresistance of SrFe1-xCoxO3-d

TL;DR

This study investigates the anomalous Hall effect and magnetoresistance in SrFe1-xCoxO3-d, revealing a reentrant spin-glass phase and unusual Hall coefficient behavior linked to magnetic structure and spin-dependent tunneling.

Contribution

It provides new insights into the relationship between magnetic phases and transport properties in SrFe1-xCoxO3-d, highlighting the reentrant spin-glass phase effects.

Findings

Reentrant spin-glass phase confirmed by neutron diffraction.

Unusual behavior of anomalous Hall coefficient in the spin-glass phase.

Magnetoresistance explained by a spin-dependent tunneling model.

Abstract

Transport and magnetic studies on polycrystalline samples of SrFe1-xCoxO3-d have been carried out to investigate the relationship between the magnetic structure and the anomalous Hall resistivity rH. The hysteretic behavior of the magnetization observed in the measurements with varying temperature T up and then down after zero field cooling indicates that the system has the reentrant spin-glass phase, which is supported by the increasing width of the magnetic reflections observed by neutron diffraction with decreasing T below the Curie temperature TC. Detailed analyses of the observed Hall resistivity rH indicate that the anomalous Hall coefficient exhibits unusual behavior in the reentrant spin-glass phase. The magnetic field (H)- and T-dependence of the magnetoresistance of the present system can be understood by a spin dependent tunneling model.