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Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 54: Magnetic Coupling Phenomena

MA 54.5: Talk

Friday, March 20, 2015, 10:30–10:45, EB 301

Room temperature antiferromagnetism and exchange bias in BiFeO3 / CoFe — •Christian Sterwerf, Jan-Michael Schmalhorst, and Günter Reiss — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany

In this work we report room temperature exchange bias in bilayers of antiferromagnetic BiFeO3 and ferromagnetic CoFe.

Epitaxial BiFeO3 thin films were grown by reactive DC and RF magnetron co-sputter deposition on SrTiO3 (100) substrates. Additional ferromagnetic CoFe layers with varying thicknesses were deposited to investigate the magnetic coupling between the films.

The crystallographic properties of the films are determined by means of x-ray diffraction and x-ray reflectivity. The amplitude of the exchange bias is investigated by the magneto-optical Kerr effect (MOKE) and the temperature dependent anisotropic magnetoresistance.

We found an exchange bias of more than Hex = 75 Oe at room temperature accompanied by an increase of the coercive field of the CoFe layers to Hc=60 Oe.

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