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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the micromagnetic structure of cross-tie walls in permalloy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2447-2452 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The modified differential phase contrast (MDPC) mode of Lorentz electron microscopy was used to study the micromagnetic structure of cross-tie walls in permalloy. The distribution of magnetic induction along these walls is characterized and studied in detail by vector mappings calculated from MDPC image pairs. The wall thickness of the cross-tie wall is determined by fitting the calculated image signal of an analytical function to the MDPC wall profiles. A pronounced dip in the wall width is found at the center of the vortex structure of the cross-tie wall. The results are compared to theoretical calculations by Nakatani, Uesaka, and Hayashi, Jpn. J. Appl. Phys. 28, 2485 (1989).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353102
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  • 2
    Electronic Resource
    Electronic Resource
    Micromagnetic structure of domains in Co/Pt multilayers. I. Investigations of wall structure (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 7431-7437 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis of the micromagnetic structure of domains and domain walls in Co/Pt multilayer films is reported. Magneto-optically written domains have been imaged in a scanning transmission electron microscope by using the modified differential phase contrast mode of Lorentz electron microscopy. These have been compared with computer-simulated images based on a two-dimensional model of a circular, perpendicular magnetized domain with a Bloch-like wall structure. Agreement is found for the domain and stray field contrast, but the absence of wall contrast in the experimental images indicates a more complex wall structure in the multilayer than was assumed by the model. In a further series of calculations the magnetic microstructure of a Co/Pt multilayer was modeled by solving the Landau–Lifshitz–Gilbert equations. These suggest that the wall structure varies throughout the thickness of the multilayer, allowing significant saving of magnetostatic energy through the establishment of flux closure paths close to the walls, and are consistent with experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354964
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Lorentz electron microscopy studies of magnetization reversal processes in epitaxial Fe(001) films : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6440-6442 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic domain structure and microscopic magnetization reversal processes in epitaxial Fe/GaAs(001) films with cubic anisotropy and in-plane easy axes have been investigated by a Lorentz microscope equipped with a magnetizing stage. For the films of a few hundred angstroms thickness we observe the single domain remanent state predicted for a two-dimensional film but find that domains play a crucial role in the magnetic reversal process. For reversal along the in-plane 〈110〉 directions (hard axes), magnetization reversal proceeds via a combination of coherent rotation and displacements of weakly pinned 90° domain walls at critical fields. For magnetization reversal along the in-plane 〈100〉 directions (easy axes), an irregular checkerboard domain structure develops at the critical field and both 180° and 90° domain walls coexist. The reversal of the domains with magnetization vector opposite to the applied field direction takes place by a combination of two 90° reorientations. We discuss how these processes are related to the magnetic anisotropies present in the film and the macroscopic M-H hysteresis curves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358248
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  • 4
    Electronic Resource
    Electronic Resource
    Micromagnetic structure of domains in Co/Pt multilayers. II. Investigations of domain structures in written marks (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 7438-7442 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis is presented of the detailed effects of varying the write parameters in Co/Pt multilayer films. Domains written thermomagnetically by laser modulation have been imaged using the modified differential phase contrast mode of Lorentz electron microscopy. The effects of different laser powers and bias fields were investigated. While the domain size increases with laser power, the bias field is found to have a profound effect on domain regularity. The periodicity of the irregular circumference of the domains written at high-bias fields closely resembles the mean repeat in the ac-demagnetized state suggesting that it arises as a relaxation phenomenon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354965
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  • 5
    Electronic Resource
    Electronic Resource
    Differential phase contrast microscopy of magnetic materials
    Amsterdam : Elsevier
    Ultramicroscopy 47 (1992), S. 331-338 
    Details
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(92)90162-D
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