Computational Modelling of Ring-Shaped Magnetic Domains

1998 ◽  
Vol 529 ◽  
Author(s):  
A.F. Gal'tsev ◽  
V.G. Pokazan'ev ◽  
Y.I. Yalishev
Keyword(s):  
Local Density ◽  
Computational Modelling ◽  
Low Frequency ◽  
Magnetic Domain ◽  
Magnetic Film ◽  
Static Stability ◽  
Film Plane ◽  
Theoretical Research ◽  
Magnetization Distribution ◽  
Domain Structures

AbstractA theoretical research of static stability of peculiar localized domain structures (LDS) in a thin magnetic film with the perpendicular anisotropy is presented. The model describes a system consisting of cylindrical magnetic domain (CMD) and several concentric ring-shaped domains. Such structures arise under influence of the external low frequency (100–1000 Hz) magnetic field applied perpendicular to the film plane and were observed experimentally in 1992. Non-linear singular integro-differential equation for a magnetization distribution is provided by a minimization condition for the system's complete energy local density. Energy dependencies on geometry parameters are calculated numerically. The conditions of magnetostatic stabilization of the simplest CMD-ring system, as well as some of its dynamical properties, are discussed in detail on this basis.

scholarly journals Magnetic properties of (Bi1−xLax)(Fe,Co)O3 films fabricated by a pulsed DC reactive sputtering and demonstration of magnetization reversal by electric field

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Munusamy Kuppan ◽  
Daichi Yamamoto ◽  
Genta Egawa ◽  
Sivaperuman Kalainathan ◽  
Satoru Yoshimura
Keyword(s):  
Electric Field ◽  
Magnetization Reversal ◽  
High Performance ◽  
Magnetic Domain ◽  
Magnetic Film ◽  
Film Plane ◽  
Force Microscopy ◽  
Domain Structures ◽  
Pulsed Dc ◽  
Submicron Scale

Abstract(Bi1−xLax)(Fe,Co)O3 multiferroic magnetic film were fabricated using pulsed DC (direct current) sputtering technique and demonstrated magnetization reversal by applied electric field. The fabricated (Bi0.41La0.59)(Fe0.75Co0.25)O3 films exhibited hysteresis curves of both ferromagnetic and ferroelectric behavior. The saturated magnetization (Ms) of the multiferroic film was about 70 emu/cm3. The squareness (S) (= remanent magnetization (Mr)/Ms) and coercivity (Hc) of perpendicular to film plane are 0.64 and 4.2 kOe which are larger compared with films in parallel to film plane of 0.5 and 2.5 kOe. The electric and magnetic domain structures of the (Bi0.41La0.59)(Fe0.75Co0.25)O3 film analyzed by electric force microscopy (EFM) and magnetic force microscopy (MFM) were clearly induced with submicron scale by applying a local electric field. This magnetization reversal indicates the future realization of high performance magnetic device with low power consumption.

Microstructural and Magnetic Properties of C/Co/C Pseudo-Sandwich Granular Films by Facing Sputtering

2005 ◽  
Vol 475-479 ◽  
pp. 3737-3740 ◽  
Author(s):  
Shun Zhen Feng ◽  
Huiyuan Sun ◽  
Hongyun Yu ◽  
Fengju Gao ◽  
Chengfu Pan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Layer Thickness ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Magnetic Domain ◽  
Film Plane ◽  
Glass Substrates ◽  
Domain Structures ◽  
Average Grain Size ◽  
Hcp Structure

Granular C/Co/C films have been prepared by magnetron sputtering from C and Co onto glass substrates at room temperature and subsequent in situ annealing. C and Co targets use an RF and DC facing deposition mode respectively. The structural and magnetic properties of films at room temperature were investigated as functions of Co layer thickness, C layer thickness and annealing temperature. X-ray diffraction (XRD) shows the majority Co nanograins are formed as the hexagonal-close-packed (hcp) structure annealing at 400 °C. Vibrating sample magnetometer (VSM) measurements indicate that the magnetic moment lies well in the film plane. Hc reaches maximum near 20 nm-thick Co layer and 30 nm-thick C layer with annealing temperature of 400 °C for 30 min. Remanent squareness (S) close to 1 was achieved for the film in which C layer thickness is 45 nm. Scanning probe microscope (SPM) was used to scan surface morphology and magnetic domain structures. The average grain size varies from 10 nm to 15 nm after annealing.

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.

Domains and domain nucleation in magnetron-sputtered CoCr thin films

1993 ◽  
Vol 51 ◽  
pp. 1046-1047
Author(s):  
B. G. Demczyk
Keyword(s):  
Thin Films ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Domain Size ◽  
Film Plane ◽  
Magnetic Domain Structure ◽  
Perpendicular Magnetization ◽  
Columnar Grains ◽  
Reversal Mechanism ◽  
Lorentz Transmission Electron Microscopy

CoCr thin films have been of interest for a number of years due to their strong perpendicular anisotropy, favoring magnetization normal to the film plane. The microstructure and magnetic properties of CoCr films prepared by both rf and magnetron sputtering have been examined in detail. By comparison, however, relatively few systematic studies of the magnetic domain structure and its relation to the observed film microstructure have been reported. In addition, questions still remain as to the operative magnetization reversal mechanism in different film thickness regimes. In this work, the magnetic domain structure in magnetron sputtered Co-22 at.%Cr thin films of known microstructure were examined by Lorentz transmission electron microscopy. Additionally, domain nucleation studies were undertaken via in-situ heating experiments.It was found that the 50 nm thick films, which are comprised of columnar grains, display a “dot” type domain configuration (Figure 1d), characteristic of a perpendicular magnetization. The domain size was found to be on the order of a few structural columns in diameter.

Highlights in the history of X-ray topography1

1995 ◽  
Vol 210 (6) ◽  
Author(s):  
A. R. Lang
Keyword(s):  
Magnetic Domain ◽  
Diffraction Theory ◽  
Dislocation Loops ◽  
X Ray Diffraction ◽  
X Ray ◽  
Domain Structures ◽  
Structure Factors ◽  
History Of ◽  
Dislocation Sources ◽  
Non Destructive

AbstractX-ray topography provides a non-destructive method of mapping point-by-point variations in orientation and reflecting power within crystals. The discovery, made by several workers independently, that in nearly perfect crystals it was possible to detect individual dislocations by X-ray diffraction contrast started an epoch of rapid exploitation of X-ray topography as a new, general method for assessing crystal perfection. Another discovery, that of X-ray Pendellösung, led to important theoretical developments in X-ray diffraction theory and to a new and precise method for measuring structure factors on an absolute scale. Other highlights picked out for mention are studies of Frank-Read dislocation sources, the discovery of long dislocation helices and lines of coaxial dislocation loops in aluminium, of internal magnetic domain structures in Fe-3 wt.% Si, and of stacking faults in silicon and natural diamonds.

Magnetic domain structures in multilayered NiFe films

1979 ◽  
Vol 50 (B3) ◽  
pp. 2384-2386 ◽  
Author(s):  
S. R. Herd ◽  
K. Y. Ahn
Keyword(s):  
Magnetic Domain ◽  
Domain Structures

The Influences of Depositing Angles on TbFe Film Magnetic and Magnetostrictive Characteristics

2005 ◽  
Vol 475-479 ◽  
pp. 3757-3760
Author(s):  
Hong Chuan Jiang ◽  
Wan Li Zhang ◽  
Bin Peng ◽  
Wen Xu Zhang ◽  
Shi Qing Yang
Keyword(s):  
External Field ◽  
Magnetic Domain ◽  
Grain Morphology ◽  
Dc Magnetron Sputtering ◽  
Easy Magnetization ◽  
Magnetization Direction ◽  
Saturation Field ◽  
Domain Structures ◽  
Columnar Grain ◽  
Easy Magnetization Direction

In this paper, the influences of depositing angles on TbFe film magnetic and magnetostrictive characteristics were discussed. TbFe films were deposited by DC magnetron sputtering. With the decrease of depositing angles from 900 to 150, TbFe film in-plane magnetization measured at 1600kA.m-1 external field is greatly increased. With the decrease of depositing angles from 900 to 150, the magnetostrictive saturation field is decreased. TbFe film in-plane magnetostriction is improved when depositing angles are changed from 900 to 150. Magnetic domain structures detected by MFM indicates that film easy magnetization direction is gradually changed from perpendicular to parallel with the decrease of depositing angles. The variation of film magnetic and magnetostrictive performances can be explained by the oblique anisotropy associated with columnar grain morphology of the films.

Spin-Polarized Scanning Electron Microscope for Analysis of Complicated Magnetic Domain Structures

1986 ◽  
Vol 25 (Part 2, No. 9) ◽  
pp. L758-L760 ◽  
Author(s):  
Kazuyuki Koike ◽  
Hideo Matsuyama ◽  
Katsuya Mitsuoka ◽  
Kazunobu Hayakawa
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Magnetic Domain ◽  
Domain Structures ◽  
Spin Polarized ◽  
Scanning Electron
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