Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.38: Poster

Tuesday, March 17, 2015, 09:30–13:00, Poster A

Huge exchange bias in polycrystalline MnN/CoFe bilayers at room temperature — •Mareike Dunz and Markus Meinert — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany

In spintronics, the exchange bias effect is used to pin a ferromagnetic layer to an antiferromagnet, making its magnetization less sensitive to external magnetic fields.

We present a polycrystalline MnN/CoFe bilayer system that shows huge exchange bias of more than 1000 Oe at room temperature. The antiferromagnetic MnN was reactively sputtered on a buffer layer and found to crystallize in the tetragonal face centered θ-phase by x-ray diffraction. To activate exchange bias, the samples were annealed at various temperatures in a vacuum furnace and field cooled for 30 minutes. We discuss the temperature and film thickness dependence of the exchange bias in detail.