Electronic, magnetic and galvanomagnetic properties of Co-based Heusler alloys: Possible states of a half-metallic ferromagnet and spin gapless semiconductor

A A Semiannikova,E B Marchenkova,P S Korenistov,V V Marchenkov,Yu A Perevozchikova,V Yu Irkhin

doi:10.1063/9.0000118

A A Semiannikova, E B Marchenkova + Show 4 more

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https://doi.org/10.1063/9.0000118

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Journal: AIP Advances	Publication Date: Jan 1, 2021
Citations: 6	License type: cc-by

Affiliation: M.N. Mikheev Institute of Metal Physics

Abstract

Parameters of the energy gap and, consequently, electronic, magnetic and galvanomagnetic properties in different X2YZ Heusler alloys can vary quite strongly. In particular, half-metallic ferromagnets (HMFs) and spin gapless semiconductors (SGSs) with almost 100% spin polarization of charge carriers are promising materials for spintronics. The changes in the electrical, magnetic and galvanomagnetic properties of the Co2YSi (Y = Ti, V, Cr, Mn, Fe) and Co2MnZ Heusler alloys (Z = Al, Si, Ga, Ge) in possible HMF- and/or SGS-states were followed and their interconnection was established. Significant changes in the values of the magnetization and residual resistivity were found. At the same time, the correlations between the changes in these electronic and magnetic characteristics depending on the number of valence electrons and spin polarization are observed.

Highlights

The correlations between the changes in these electronic and magnetic characteristics depending on the number of valence electrons and spin polarization are observed
The motivation is that half-metallic ferromagnets (HMFs) and spin gapless semiconductors (SGSs) are promising materials for spintronics with almost 100% spin polarization of charge carriers
The observation of HMF and SGS-states was proposed in materials based on the Co2YSi (Y = Fe, Mn), Mn2CoAl and CoFeMnSi Heusler alloys and close to 100% spin polarization in Refs. 3–7

Summary

Introduction

The motivation is that half-metallic ferromagnets (HMFs) and spin gapless semiconductors (SGSs) are promising materials for spintronics with almost 100% spin polarization of charge carriers. They possess a gap near the Fermi energy for the current carriers with spin down. The observation of HMF and SGS-states was proposed in materials based on the Co2YSi (Y = Fe, Mn), Mn2CoAl and CoFeMnSi Heusler alloys and close to 100% spin polarization in Refs. The aim of the work is to follow the changes in the electrical, magnetic and galvanomagnetic properties and to establish their interconnection and basic behavior patterns of the Co2YSi (Y = Ti, V, Cr, Mn, Fe) and Co2MnZ Heusler alloys (Z = Si, Al, Ga, Ge) in the HMF- and/or SGS-states

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Results

Conclusion