DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2004 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

M: Metallphysik

M 24: Nanoskalige Materialien III

M 24.3: Talk

Thursday, March 11, 2004, 10:45–11:00, H16

Thermal reaction and stability of GMR Cu/NiFe thin films — •Constantin Buzau Ene1, Guido Schmitz2, and Reiner Kirchheim11Tammann-Str. 1, D-37077 Göttingen — 2Wilhelm-Klemm-Str. 10, D-48149 Münster

In recent years reading heads based on the giant magnetoresistance effect (GMR) made possible a dramatic increase in magnetic recording density. However, for many potential applications the thermal stability of the magnetic multilayers are an important issue. In our study Cu/Ni79Fe21 (permalloy) multilayer stacks were deposited onto needle-shaped W tips by ion beam sputtering and analyzed by atom probe tomography after appropriate heat treatments. This analysis technique has been proven to yield a real three-dimensional quantitative chemical and structural analysis at a subnanometer scale.

After annealing at 250C for 30min, no significant structural or chemical transformation of the initial layer system is detected, although such a heat treatment reduces the magnetoresistivity already appreciably. Clear grain boundary wetting is observed after annealing at 400C for 30min. Further annealing at 500C for 20min and 40min still preserves the layered structure with a homogeneous solution of Ni inside the Cu layers of up to 25 at.% Ni.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2004 > Regensburg