Regensburg 2010 – wissenschaftliches Programm
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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.