Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Magnetic Thin Films I
MA 11.11: Vortrag
Dienstag, 27. März 2007, 12:45–13:00, H10
Magnetic ordering in amorphous nanolaminates — Panagiotis Korelis1, •Andreas Liebig1, Hans Lidbaum2, Björgvin Hjörvarsson1, and Klaus Leifer2 — 1Department of Physics, Uppsala University, Box-530, SE-75121 Uppsala, Sweden — 2Department of Engineering Sciences, Uppsala University, Box-534, SE-75121 Uppsala, Sweden
The magnetic properties of Fe90Zr10/Al70Zr30 amorphous nanolaminates were explored using the Magneto Optical Kerr Effect. The structural quality was determined using X-ray reflectivity as well as High Resolution Transmission Electron Microscopy. The samples exhibited well-defined total-, as well as layer- thicknesses. The absence of long range order was established by X-ray diffraction, and the chemical composition by Rutherford Back scattering.
The critical temperature of the nanolaminates is extremely well defined, consistent with chemical and structural homogenity. The moment is confined within the layers and no in-plane anisotropy is observed. The ordering temperature scales with the inverse thickness of the Fe90Zr10 layers, when the coupling across the Al70Zr30 layers is weak. The critical temperature was determined to be 200 K, in the thick film limit, which is similar to the value obtained for bulk samples with the same composition.
We will discuss the influence of the interlayer coupling on the ordering and illustrate the presence of a dimensional crossover when the thickness of the magnetic layers reaches a critical thickness.