Magnetic tuning of tunnel conductivity

TL;DR

This paper demonstrates how magnetic fields can tune tunnel conductivity in spintronics devices by analyzing the relationship between Fermi energy variation and spontaneous magnetization near the ferromagnetic quantum critical point.

Contribution

It introduces a simple two-subband Stoner model to explain magnetic tuning of tunnel conductivity near the ferromagnetic transition.

Findings

Fermi energy variation is inversely proportional to spontaneous magnetization.

The effect is most pronounced near the quantum critical point.

Potential applications in spintronics device tuning.

Abstract

Using the simplest two-subband Stoner model, it is shown that the variation of the Fermi energy under applied magnetic field is inverse proportional to the spontaneous magnetization and hence most pronounced close to the critical Stoner condition, that is to the quantum critical point of ferromagnetic transition. The perspectives of this result for magnetic tuning of tunnel conductivity in spintronics devices is discussed.