Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)
MA 32.42: Poster
Freitag, 29. Februar 2008, 11:15–14:00, Poster E
Quantitative Lorentz transmission electron microscopy of structured thin permalloy films — •Sergej Nepijko1, Gerd Schönhense1, and Josef Zweck2 — 1Institute of Physics, University Mainz, Staudingerweg 7, 5518 Mainz, Germany — 2Institute of Experimental and Applied Physics, University Regensburg, 93040 Regensburd, Germany
Defocusing of the image, during of investigation of ferromagnetic particles with transmission electron microscope (Lorentz microscopy), gives the ability to determine the distribution of the magnetic field of the specimen, quantitatively. Measurements were done on permalloy disk-shaped particles with diameter of 50 nm and squares 70x70 nm2 and thickness of 10 nm. Disk-shaped particles exhibit a vortex structure, which was characterized with magnetic induction of 1.1 T. Square particles contained four domains, which produce a Landau-Lifshitz flux-closure structure. Value of magnetic induction of domain was also 1.1 T and the width of the 90 degrees Néel boundary between them was 4.5 nm. Stray field in edges of square particle reached 0.35 T.