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Finite-temperature depolarization in half metals.

¹Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 23, 2011

Summary

Thermal spin mixing in half-metallic ferromagnets means conductivity is always nonzero, even in the

Area of Science:

Condensed matter physics
Materials science

Background:

Half-metallic ferromagnets ideally exhibit complete spin polarization.
Understanding temperature effects on spin polarization is crucial for spintronic applications.

Purpose of the Study:

Investigate the temperature dependence of spin polarization in type-I half-metallic ferromagnets.
Compare their behavior to other magnetic materials.

Main Methods:

Analysis of spin-down density of states (DOS) at finite temperatures.
Consideration of intersublattice interactions, spin-orbit coupling, and crystal imperfections.
Modeling using a version of the Kondo model and unrestricted Hartree-Fock approximation.

Main Results:

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Stable atomic moments lead to nonzero spin-down DOS at finite temperatures, causing thermal spin mixing.

Half-metallic ferromagnetism is an idealized limit due to thermal spin mixing.

Increasing interatomic hopping destabilizes moments, reducing spin polarization via Stoner-type excitations.

Conclusions:

Thermal spin mixing limits the practical realization of ideal half-metallic ferromagnetism.
The hybridization gap closure temperature (T(*)) depends on hybridization gap and band width.
One-electron contributions are more significant than correlations for spin polarization behavior.