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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.49: Poster

Thursday, March 15, 2018, 15:00–18:00, Poster C

IrMnGa as candidate for a fully compensated ferrimagnet — •Johannes Kroder, Enke Liu, Gerhard H. Fecher, and Claudia Felser — Max Planck Institut CPfS, Dresden, Germany

Zero net magnetization and the absence of stray fields make antiferromagnets promising candidates for spintronics applications. Conventional antiferromagnets however have an identical electronic structure for both spin directions and therefore cannot carry any spin polarized current. An interesting alternative are fully compensated ferrimagnets (FC FiM) which consist of two antiferromagnetically coupled sublattices of different atomic species that cancel to a zero net magnetization. Due to the different sublattices FC FiM can be spin polarized, which was recently confirmed for Mn₂Ru_xGa [1] and for Mn_1.5V_0.5FeAl [2].

In general, full- and half-Heusler compounds are a promising material class to search for new FC FiM since they often show half metallicity. Here we report on the cubic half-Heusler compound IrMnGa. Powder X-ray diffraction reveal a B32a-type structure where manganese occupies two different crystallographic sites which are coupled antiferromagnetically. VSM measurements and DFT calculations indicate that IrMnGa is not fully compensated but has a small residual moment. Moreover, we show that the magnetization can be significantly reduced by varying the composition which makes off-stoichiometric IrMnGa an interesting candidate as FC FiM.
H. Kurt et.al, PRL 112, 027201 (2014); [2] R. Stinshoff et.al, PRB 95, 060410(R) (2017)