Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.56: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Exchange bias in Fe/Cr bilayers — •Syed Rizwan Ali, Marian Fecioru-Morariu, Bilal Janjua, Coen Smits, and Gernot Güntherodt — Physikalisches Institut (IIA), RWTH Aachen, 52056 Aachen, Germany

Exchange coupling in Fe/Cr bilayers have been studied in either molecular beam epitaxy (MBE) grown or sputtered samples. Our sputtered samples show exchange bias which changes its sign as a function of temperature. This temperature was found to increase with the thickness of the Cr layer. The positive part of the exchange bias shows a maximum and decreases with temperature up to the blocking temperature of the Cr thin film. The coercivity was also found to vary in close correlation with the exchange bias. In order to exclude the possibility of antiferromagnetic oxide formation at the interface, samples were also grown in ultra high vacuum using MBE. We have found a similar qualitative behaviour of exchange bias and coercivity in the MBE grown samples as compared to the sputtered ones. However, the sign change effect was more pronounced in MBE grown samples.