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

Abstract

Parameters of the energy gap and, consequently, electronic, magnetic and galvanomagnetic properties in different X${}_2$YZ 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 Co${}_2$YSi (Y = Ti, V, Cr, Mn, Fe) and Co${}_2$MnZ 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.

10 pages

References in corpus (4)

• Half-metallic ferromagnets: From band structure to many-body effects
• Calculated electronic and magnetic properties of the half-metallic, transition metal based Heusler compounds
• Ab initio prediction of half-metallic properties for the ferromagnetic Heusler alloys Co${}_2$MSi (M=Ti, V, Cr)
• Half-Metallic Ferromagnets and Spin Gapless Semiconductors