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Stability of magnetic vortices in flat submicron permalloy cylinders (2002)

Schneider, M. ; Hoffmann, H. ; Otto, S. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 92 (2002), S. 1466-1472

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: We have investigated the magnetic properties of flat permalloy cylinders by Lorentz transmission electron microscopy and micromagnetic simulations. The magnetization patterns during in situ magnetizing experiments have been imaged and they revealed that the magnetization reversal of the cylindrically shaped dots investigated is determined by the formation and annihilation of magnetic vortices. Furthermore, the experiments and micromagnetic simulations showed a dependence of the vortex annihilation field not only on the aspect ratio but also on the absolute thickness of the cylinders. The diameter of the cylindrical dots was varied between 150 and 1000 nm, and the thicknesses were 3, 5.5, 8.3, 15, and 20 nm, respectively. The formation of inhomogeneous magnetization patterns prior to vortex evolution was observed and by a comparison of the experimental to simulated Fresnel images these patterns can be identified as S- and C-like states. © 2002 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1490623

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Herstellung und Umsetzungen von β-Lactamen (1968)

Haug, Th. ; Lohse, F. ; Metzger, K. ; [et al.]

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 51 (1968), S. 2069-2089

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ISSN: 0018-019X

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The cycloaddition of N-chlorosulfonyl-isocyanate with isoprene, butadiene and a polyolefin as well as the reaction of ketenes with some bis-azomethines were investigated. Suitably substituted bis-azomethines could be separated in the rac. and the meso-form. The reactivity of the azetidinones towards hydrolysis and hydrogenation was tested. Attempts to polymerise 4-vinyl-azetidin-2-one, polyazetidinone and N-substituted bis-azetidinones to give cross-linked poly-β-amides were not successful.

Additional Material: 6 Tab.