Conductance through a Magnetic Domain Wall in Double Exchange System

TL;DR

This paper investigates how magnetic domain walls affect electrical conductance in double exchange systems, revealing that low carrier density leads to near-complete conductance blockade even with wide domain walls, with implications for manganese oxides.

Contribution

It provides a detailed calculation of conductance dependence on domain wall width and carrier density in double exchange systems, highlighting the near-complete blockade at low densities.

Findings

Conductance decreases significantly with increasing domain wall width at low carrier densities.

Near-complete conductance blockade occurs even for smooth spin configurations when carrier density is low.

Results are relevant for understanding transport in manganese oxides.

Abstract

The conductance through a magnetic domain wall is calculated for the double exchange system as a function of energy and the width of the domain wall. It is shown that when the carrier density is low enough, the blockade is almost complete even for the smoothly varying spin configuration, i.e., large width of the domain wall. This result is applied to the manganese oxides.