2012/07/27 by Dirk Bombor, Christian G. F. Blum, Christian Blum +9
Materials Science · Physics and Astronomy · #Condensed matter physics #Electrical resistivity and conductivity #Electron #Ferromagnetism #Heusler alloys: electronic and magnetic properties #MXene and MAX Phase Materials #Magnetic field #Magnetic properties of thin films #Magnetoresistance #Magnon #Materials science #Physics #Quantum mechanics #Scattering #Scattering rate #Spin polarization #Superconductivity #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.110.066601
arxiv created 2012/07/27 · openalex publication_date 2013/02/07 · arxiv updated 2013/02/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Half-metallic ferromagnetism stands for the technologically sought-after metallicity with 100% spin polarization. Electrical transport should, in principle, sensitively probe half-metallic ferromagnetism, since electron-magnon scattering processes are expected to be absent, with clear-cut consequences for the resistivity and the magnetoresistance. Here we present electrical transport data for single-crystalline Co(2)FeSi, a candidate half-metallic ferromagnet Heusler compound. The data reveal a textbooklike exponential suppression of the electron-magnon scattering rate with decreasing temperature which provides strong evidence that this material indeed possesses perfect spin polarization at low temperature. However, the energy scale for thermally activated spin-flip scattering is relatively low (activation gap Δ≈100 K) which has decisive influence on the magnetoresistance and the anomalous Hall effect, which exhibit strong qualitative changes when crossing T≈100 K.