0000000000451354

AUTHOR

Roman Fetzer

showing 2 related works from this author

Spin-resolved low-energy and hard x-ray photoelectron spectroscopy of off-stoichiometric Co2MnSi Heusler thin films exhibiting a record TMR

2015

Half-metallic Co2MnSi-based Heusler compounds have attracted attention because they yield very high tunnelling magnetoresistance (TMR) ratios. Record TMR ratios of 1995% (at 4.2 K) are obtained from off-stoichiometric Co2MnSi-based magnetic tunnel junctions. This work reports on a combination of band structure calculations and spin-resolved and photon-polarisation-dependent photoelectron spectroscopy for off-stoichiometric Heusler thin films with the composition Co2Mn1.30Si0.84. Co and Mn are probed by magnetic dichroism in angle-resolved photoelectron spectroscopy at the 2p core level. In contrast to the delocalised Co 3d states, a pronounced localisation of the Mn 3d states is deduced fro…

Valence (chemistry)Materials scienceAcoustics and UltrasonicsCondensed matter physicsMagnetoresistanceFermi energyDichroismPhoton energyCondensed Matter PhysicsLinear dichroismSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCondensed Matter::Materials ScienceX-ray photoelectron spectroscopyCondensed Matter::Strongly Correlated ElectronsElectronic band structureJournal of Physics D: Applied Physics
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Impact of local order and stoichiometry on the ultrafast magnetization dynamics of Heusler compounds

2015

Nowadays, a wealth of information on ultrafast magnetization dynamics of thin ferromagnetic films exists in the literature. Information is, however, scarce on bulk single crystals, which may be especially important for the case of multi-sublattice systems. In Heusler compounds, representing prominent examples for such multi-sublattice systems, off-stoichiometry and degree of order can significantly change the magnetic properties of thin films, while bulk single crystals may be generally produced with a much more well-defined stoichiometry and a higher degree of ordering. A careful characterization of the local structure of thin films versus bulk single crystals combined with ultrafast demag…

Magnetization dynamicsKerr effectMaterials scienceAcoustics and UltrasonicsCondensed matter physicsBand gapDemagnetizing fieldPhysics::OpticsFermi energyElectronic structureCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCondensed Matter::Materials ScienceFerromagnetismCondensed Matter::SuperconductivityThin filmJournal of Physics D: Applied Physics
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