Correlation between magnetism and spin-dependent transport in CoFeB alloys

TL;DR

This paper investigates the relationship between spin polarization and magnetic moment in amorphous CoFeB alloys, revealing a surprising correlation mediated by s-d hybridization that allows tuning of their electronic and magnetic properties.

Contribution

It demonstrates a novel correlation between TSP and magnetic moment in CoFeB alloys through s-d hybridization, enabling property tuning.

Findings

Correlation between TSP and magnetic moment established

s-d hybridization as the mediating mechanism identified

Electronic and magnetic properties are tunable in CoFeB alloys

Abstract

We report a correlation between the spin polarization of the tunneling electrons (TSP) and the magnetic moment of amorphous CoFeB alloys. Such a correlation is surprising since the TSP involves s-like electrons close to the Fermi level (EF), while the magnetic moment mainly arises due to all d-electrons below EF. We show that probing the s and d-bands individually provides clear and crucial evidence for such a correlation to exist through s-d hybridization, and demonstrate the tuneability of the electronic and magnetic properties of CoFeB alloys.