Effects of Ferromagnetic Magnetic Ordering and Phase Transition on the Resistivity of Spin Current

TL;DR

This study uses Monte Carlo simulations to demonstrate how magnetic phase transitions in ferromagnets cause significant peaks in spin current resistivity, aligning well with experimental observations.

Contribution

The paper introduces a simulation-based analysis of spin resistivity across phase transitions, highlighting the role of magnetic domains in resistivity peaks.

Findings

Resistivity peaks sharply near the critical temperature.

Magnetic domain formation causes the resistivity anomaly.

Simulation results agree with experimental data.

Abstract

It has been shown experimentally a long time ago that the magnetic ordering causes an anomalous behavior of the electron resistivity in ferromagnetic crystals. Phenomenological explanations based on the interaction between itinerant electron spins and lattice spins have been suggested to explain these observations. We show by extensive Monte Carlo simulation that this behavior is also observed for the resistivity of the spin current calculated as a function of temperature ($T$) from low-$T$ ordered phase to high-$T$ paramagnetic phase in a ferromagnet. We show in particular that across the critical region, the spin resistivity undergoes a huge peak. The origin of this peak is shown to stem from the formation of magnetic domains near the phase transition. The behavior of the resistivity obtained here is compared to experiments and theories. A good agreement is observed.