Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)
MA 13.15: Poster
Tuesday, March 24, 2009, 10:15–13:00, P1A
Magnetooptical properties(MOKE) of spin valves based on Co, Cu or Au — Iryna Cheshko1, •Dmytro Kutnyakhov2, Larisa Odnodvorets1, Sergej Protsenko1, Sergej Nepijko2, and Gerd Schoenhense2 — 1Sumy State University, 2, R.-Korsakov street, 40007, Sumy, Ukraine — 2Institute of Physics of University Mainz, 7, Staudingerweg, 55099, Mainz, Germany
Starting from the structural and phase states of the film systems on the basis of Co, Cu and Au, we fabricated a spin valve structure as multilayer film system of Au(3)/Co(3)/Au(Cu)(6)/Co(20)/Au(40)/Cr(3)/s (s-substrate, thickness of layers in nm). The layer Co(3) is more sensible to an external magnetic field and begins the process of remagnetization of the domain structure at lower field amplitudes.
The GMR effect shows up as a variation of the resistivity as function of the magnetic field. It reflects the different fields for the remagnetization of overlayer and underlayer. Thus at the change of the external magnetic field this system is creating a bipolar electric signal with high amplitude. The layers Cr(3) and Au(40) support high adhesion to the sital(glass-ceramic) substrate and provide the electric contacts. X-ray diffraction revealed that at annealing the spin valve structures to 700 K granular solid solutions (Au, Co) or (Cu, Co) occurred. Research of magnetoresistance and magnetooptical Kerr effect (MOKE) confirmed the conclusion about the formation of granular solid solutions.
This work is collaboration between the Institute of Physics of University Mainz (Germany) and Sumy State University (Ukraine).