Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.107: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Investigation of thermally evaporated Fe/MgO/Fe MTJs and NaCl layers — •Jan Rogge, Anna Regtmeier, and Andreas Hütten — Thin Films and Physics of Nanostructures, Department of Physics, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany

A high tunnel magnetoresistance effect (TMR) in magnetic tunnel junctions (MTJs) is the key for developing new spinelectronic devices like MRAM or magnetic sensors.

In order to enhance the level of crystalinity and epitaxy, we have fabricated Fe/MgO/Fe MTJs using molecular beam epitaxy (MBE). By applying the Brinkman fit to the investigated IV-curves a very low barrier height can be observed, which indicates oxygen vacancy defects in the thermally evaporated MgO barrier. Further electrical transport properties will be discussed considering the MTJs' crystal features obtained from XRD measurements.

Due to the recently predicted huge MR ratio of up to 600% for Fe/NaCl/Fe MTJs [1], we will also show preliminary results of growth studies on NaCl thin films deposited by MBE regarding its practicability as a barrier in MTJs.

[1] P. Vlaic, Third Seeheim Conference on Magnetism, (2007)