Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetic Heuslers, Half-metals and Oxides (jointly with TT)

MA 15.5: Vortrag

Montag, 20. März 2017, 16:00–16:15, HSZ 403

Magnetotransport in Half-Metallic Manganese Ruthenium Gallium — •Ciaran Fowley1, Kiril Borisov2, Gwenael Atcheson2, Yong-Chang Lau2, Naganivetha Thiyagarajah2, Rodolfo Gallardo3, Jurgen Lindner1, Zhaosheng Wang4, Erik Kampert4, Mike Coey2, Plamen Stamenov2, Karsten Rode2, and Alina Maria Deac11Institute for Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Germany — 2AMBER and School of Physics, Trinity College Dublin, Dublin 2, Ireland — 3Universidad Técnica Federico Santa María, Valparaíso, Chile — 4High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Germany

The recently discovered fully-compensated half-metal, manganese-ruthenium-gallium (MRG), is a very promising material for spintronics. It possesses tunable magnetic moment, high magnetic anisotropy field and high spin polarisation. Here, we use the extraordinary Hall effect and longitudinal magnetoresistance to characterise the properties of MRG. Experiments are carried out in pulsed magnetic fields up to 60 T at the Dresden High Magnetic Field Laboratory (HLD). The spin-flop transition, as well as a large spontaneous Hall angle (over 2%) is observed. The magneto-transport in MRG is shown to be dominated by one sublattice only. The spontaneous Hall angle is non-zero even at the magnetic compensation temperature (i.e. when the total magnetic moment is zero). MRG behaves magnetically like an antiferromagnet and electrically as a normal ferromagnet with a sizeable spin-polarisation.

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