Berlin 2005 – scientific programme

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M: Metallphysik

M 19: Nanoskalige Materialien II

M 19.3: Talk

Saturday, March 5, 2005, 11:30–11:45, TU H111

Recrystallization effect in giant magneto resistance (GMR) systems during annealing — •Vitaliy Vovk and Guido Schmitz — Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Strasse 10, D-48149 Münster, Germany

The long-term thermal stability of giant magneto resistance (GMR) multi-layer systems is a key issue regarding their technical application. In Py/Cu and Py/Cu/Co layer systems a recrystallization is induced by annealing at temperatures in the range of 400-500^∘C, which leads to a transformation of the crystallographic orientation from a [111] to a [200] wire texture. The main aim is to show that this recrystallization is triggered by the minimization of the elastic energy that is caused by the lattice mismatch between the thin film layers. Therefore, the PyCu-system is chosen for the study, since the lattice mismatch can be controlled by the concentration of iron in Py (mixture of Ni and Fe). Beside, the influence of other factors like sputtering rate, Ar-gas pressure, and magnetic fields applied during sputtering is investigated and their influence on the microstructure is discussed.