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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.90: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Measurements of the capacitance of magnetic tunnel junctions — •Ronald Lehndorff¹, Anna Gerken¹, Gerhard Jakob², Andreas Hütten¹, and Günter Reiss¹ — ¹Bielefeld University, D2 Physics, Bielefeld, Germany — ²Mainz University, Institute of Physics, Mainz, Germany

Magnetic tunnel junctions (MTJ) based on CoFeB as ferromagnetic electrodes and MgO as insulating layer are important building blocks for current and future spintronics devices owing to their huge magnetoresistive effect. Electronically, they possess not only a resistive but also a capacitive component.

Here, we present a measurement setup build to evaluate the capacitance of MTJs in an external magnetic field using an ultra-precision capacitance bridge AH 2550 from Andeen-Hagerling, Inc. We show results measured on high-ohmic CoFeB/MgO MTJs with area resistances above 1 megaohm square micron and thoroughly discuss these and the precision of the measurements.