Berlin 2008 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 28: Magnetic Thin Films III

MA 28.6: Vortrag

Donnerstag, 28. Februar 2008, 15:45–16:00, H 1012

Preparation and magnetization reversal of exchange bias structured thin films — •Christine Hamann, Jeffrey McCord, Ingolf Mönch, Rainer Kaltofen, Thomas Gemming, Rudolf Schäfer, and Ludwig Schultz — Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069 Dresden

Magnetically patterned thin films of NiFe/IrMn/Ta−NiFe/IrMnO_x with laterally modulated unidirectional anisotropy were prepared by local oxidation of the antiferromagnetic IrMn layer. Varying the lateral dimensions and orientation with respect to the anisotropy modulation, the films exhibit different magnetization reversal behaviors. While stripes aligned parallel to the unidirectional anisotropy direction display a spin valve-like two step hysteresis loop, perpendicular orientation lead to a single step shifted hysteresis loop. Magnetic domain observation reveals separate switching of the stripes for the parallel alignment and simultaneous reversal for the perpendicular orientation. By decreasing the lateral dimensions, quasi-domain states have been observed. The presented magnetic data of the exchange biased-pattered films show that we did succeed in creating an alternative method for the preparation of materials with new hybrid properties.