News Finding: Material of the future: Breakthrough for information technology based on Heusler materials 
Paper Finding: However, typically the highest spin polarizations of Heusler compounds obtained by this method amount to 60-70% at low temperatures 15 , with a single exception of 83-89% at 2 K, which collapses to C50% at room temperature 16 However, it is not clear, whether the predicted high magnetoresistance effects were not seen because the materials are contrary to predictions not half-metals or owing to the tunnel junction properties.
News Context: Material of the future: Breakthrough for information technology based on Heusler materials 
Paper Context: The magnetoresistance effect of planar tunnelling junctions between ferromagnetic electrodes is often related to the spin polarization by the application of the Jullière model 13 , which is justified only if the translational symmetry in the tunnelling process is completely broken. However, typically the highest spin polarizations of Heusler compounds obtained by this method amount to 60-70% at low temperatures 15 , with a single exception of 83-89% at 2 K, which collapses to C50% at room temperature 16 However, it is not clear, whether the predicted high magnetoresistance effects were not seen because the materials are contrary to predictions not half-metals or owing to the tunnel junction properties. Especially the pronounced reduction of the magnetoresistances at room temperature is surprising, because the Curie temperatures of Heusler compounds can approach 1,000 K (for example, Co 2 MnSi 20,21 ).