Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 54: Spin-dependent transport phenomena
MA 54.7: Vortrag
Freitag, 16. März 2018, 09:30–09:45, EB 301
Growth, structural characterisation and magnetotransport measurements in Mn3X (X = Ir, Ge) thin-films — •James M Taylor1, Edouard Lesne1, Anastasios Markou2, Pranava K Sivakumar1, Fasil K Dejene1, Claudia Felser2, and Stuart S P Parkin1 — 1Max Planck Institute for Microstructure Physics, D-06120 Halle, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
Antiferromagnetic (AFM) materials have undergone a resurgence in interest due to their potential applications in spintronic devices operating without net magnetization. Non-collinear AFMs are particularly promising, with the topological character of their chiral spin texture yielding novel phenomena such as a large anomalous Hall effect and an intrinsic spin Hall effect.
In this work, we report the magnetron sputtering growth of thin-films of the non-collinear AFMs Mn3Ir and Mn3Ge. Structural characterisation demonstrates epitaxial (111) and (001) texture in Mn3Ir and hexagonal Mn3Ge. Measurements of magnetic properties are shown, including XMCD and exchange bias fields up to HEx = 306 Oe when coupled to a ferromagnetic (FM) layer.
Finally we present electrical transport measurements, as a function of temperature and applied magnetic field, in lithographically patterned devices. Anomalous Hall effect (modifiable by a layer with strong spin-orbit coupling) is observed at low-temperatures, and spin Hall magnetoresistance investigated in AFM-FM bilayers. Possible origins of these effects, including interfacial contributions, are discussed.