The validity of the extrapolation technique for measuring wall widths in asymmetric domain walls

1977 ◽  
Vol 48 (7) ◽  
pp. 3167-3168 ◽  
Author(s):  
J. Marti ◽  
W. F. Lewis
Keyword(s):  
Domain Walls ◽  
Extrapolation Technique ◽  
Asymmetric Domain Walls

3-D Simulations of Micromagnetic Transition Structures in Vortex Asymmetric Domain Walls

2014 ◽  
Vol 215 ◽  
pp. 421-426 ◽  
Author(s):  
Vladimir V. Zverev ◽  
Mikhail N. Dubovik ◽  
Boris N. Filippov
Keyword(s):  
Nonlinear Waves ◽  
Domain Walls ◽  
Three Dimensional ◽  
Magnetic Films ◽  
Soft Magnetic ◽  
Micromagnetic Simulations ◽  
Plane Anisotropy ◽  
Transition Structures ◽  
Asymmetric Domain Walls ◽  
Soft Magnetic Films

The three-dimensional transition structures in the vortex asymmetric domain walls existing in magnetically uniaxial soft magnetic films with in-plane anisotropy are studied by micromagnetic simulations. It is shown that interaction of closely spaced transition structures results in various dynamical scenarios including vortex-antivortex annihilations, creation and annihilation of singular (Bloch) points, and excitation of nonlinear waves.

New types of asymmetric domain walls in magnetically triaxial films with a (100) surface

2010 ◽  
Vol 109 (1) ◽  
pp. 15-21 ◽  
Author(s):  
L. G. Korzunin ◽  
B. N. Filippov ◽  
F. A. Kassan-Ogly
Keyword(s):  
Domain Walls ◽  
Asymmetric Domain Walls

Nonlinear dynamics of vortex-like asymmetric domain walls in magnetic triaxial films

2004 ◽  
Vol 129 (6) ◽  
pp. 395-399 ◽  
Author(s):  
B.N. Filippov ◽  
L.G. Korzunin ◽  
F.A. Kassan-Ogly
Keyword(s):  
Nonlinear Dynamics ◽  
Domain Walls ◽  
Asymmetric Domain Walls

Interacting tails of asymmetric domain walls: Theory and experiments

2016 ◽  
Vol 93 (2) ◽  
Author(s):  
Lukas Döring ◽  
Claudia Hengst ◽  
Felix Otto ◽  
Rudolf Schäfer
Keyword(s):  
Domain Walls ◽  
Asymmetric Domain Walls ◽  
Theory And Experiments

Ritz model for asymmetric domain walls

1972 ◽  
Vol 26 (6) ◽  
pp. 1473-1479 ◽  
Author(s):  
Amikam Aharoni
Keyword(s):  
Domain Walls ◽  
Asymmetric Domain Walls

The direct determination of magnetic domain wall profiles using a split detector STEM

1978 ◽  
Vol 36 (1) ◽  
pp. 466-467
Author(s):  
J.N. Chapman ◽  
P.E. Batson ◽  
E.M. Waddell ◽  
R.P. Ferrier
Keyword(s):  
Electron Microscope ◽  
Domain Wall ◽  
Transmission Electron Microscope ◽  
Domain Walls ◽  
Photographic Plate ◽  
Magnetic Domain ◽  
Direct Determination ◽  
Quantitative Information ◽  
Scanning Transmission Electron Microscope ◽  
Transmission Electron

By far the most commonly used mode of Lorentz microscopy in the examination of ferromagnetic thin films is the Fresnel or defocus mode. Use of this mode in the conventional transmission electron microscope (CTEM) is straightforward and immediately reveals the existence of all domain walls present. However, if such quantitative information as the domain wall profile is required, the technique suffers from several disadvantages. These include the inability to directly observe fine image detail on the viewing screen because of the stringent illumination coherence requirements, the difficulty of accurately translating part of a photographic plate into quantitative electron intensity data, and, perhaps most severe, the difficulty of interpreting this data. One solution to the first-named problem is to use a CTEM equipped with a field emission gun (FEG) (Inoue, Harada and Yamamoto 1977) whilst a second is to use the equivalent mode of image formation in a scanning transmission electron microscope (STEM) (Chapman, Batson, Waddell, Ferrier and Craven 1977), a technique which largely overcomes the second-named problem as well.

Lorentz microscopy study of magnetic domain walls in Fe-Cr-Co alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 462-463
Author(s):  
Yalcin Belli
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Microscopy Study ◽  
Ferromagnetic Phase ◽  
Stable Phase ◽  
Magnetic Domains ◽  
Lorentz Microscopy ◽  
Magnetic Hardening ◽  
Electron Microscopes ◽  
Co Alloys

Fe-Cr-Co alloys have great technological potential to replace Alnico alloys as hard magnets. The relationship between the microstructures and the magnetic properties has been recently established for some of these alloys. The magnetic hardening has been attributed to the decomposition of the high temperature stable phase (α) into an elongated Fe-rich ferromagnetic phase (α1) and a weakly magnetic or non-magnetic Cr-rich phase (α2). The relationships between magnetic domains and domain walls and these different phases are yet to be understood. The TEM has been used to ascertain the mechanism of magnetic hardening for the first time in these alloys. The present paper describes the magnetic domain structure and the magnetization reversal processes in some of these multiphase materials. Microstructures to change properties resulting from, (i) isothermal aging, (ii) thermomagnetic treatment (TMT) and (iii) TMT + stepaging have been chosen for this investigation. The Jem-7A and Philips EM-301 transmission electron microscopes operating at 100 kV have been used for the Lorentz microscopy study of the magnetic domains and their interactions with the finely dispersed precipitate phases.

Temperature Dependence of Magnetic Domains and Wall Structures

1972 ◽  
Vol 30 ◽  
pp. 496-497
Author(s):  
Sonoko Tsukahara ◽  
Tadami Taoka ◽  
Hisao Nishizawa
Keyword(s):  
Temperature Dependence ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Iron Film ◽  
Objective Lens ◽  
Lorentz Microscopy ◽  
Domain Structures ◽  
Wall Structures ◽  
Crystal Films ◽  
Metallurgical Structure

The high voltage Lorentz microscopy was successfully used to observe changes with temperature; of domain structures and metallurgical structures in an iron film set on the hot stage combined with a goniometer. The microscope used was the JEM-1000 EM which was operated with the objective lens current cut off to eliminate the magnetic field in the specimen position. Single crystal films with an (001) plane were prepared by the epitaxial growth of evaporated iron on a cleaved (001) plane of a rocksalt substrate. They had a uniform thickness from 1000 to 7000 Å.The figure shows the temperature dependence of magnetic domain structure with its corresponding deflection pattern and metallurgical structure observed in a 4500 Å iron film. In general, with increase of temperature, the straight domain walls decrease in their width (at 400°C), curve in an iregular shape (600°C) and then vanish (790°C). The ripple structures with cross-tie walls are observed below the Curie temperature.

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