Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 26: Thin films – coupling effects

MA 26.6: Vortrag

Mittwoch, 14. März 2018, 10:45–11:00, EB 301

Interfacial Magnetic Exchange Coupling in a L10-MnGa/FeCo Bilayer — •Elvis Shoko and Udo Schwingenschloegl — King Abdullah University of Science and Technology, Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia

Epitaxial bilayers of L10-MnGa/Fe1-xCox are of interest in perpendicular magnetic tunnel junctions, with interfacial magnetic exchange coupling playing an important role in the functionality of such devices.[1] This exchange coupling is reported to undergo an abrupt transition from ferromagnetic (FM) to antiferromagnetic (AF) as x increases to 0.25. [2] The origin of this abrupt transition is not well understood. Using LDA+U density functional theory, we have studied the magnetic properties of these bilayers for compositions in the vicinity of x = 0.25. I will discuss the features of the exchange coupling that we obtain and some insight they provide in relation to the experimental result of Ref. 2.

[1] K. Z. Suzuki et al., Sci. Rep. 6, 30249 (2016). [2] Q. L. Ma et al., Phys. Rev. Lett. 112, 157202 (2014).