scholarly journals Estimation of magnetic domain size in chiral antiferromagnet Mn3Ir by the anomalous Hall measurements

2021 ◽  
Author(s):  
Y. Kobayashi ◽  
T. Ikebuchi ◽  
Y. Shiota ◽  
T. Ono ◽  
T. Moriyama
Keyword(s):  
Magnetic Domain ◽  
Domain Size ◽  
Hall Measurements

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.

Magnetic Domain Observation on Melt-Spun Nd-Fe-B Ribbons Using Magnetic Force Microscopy

1999 ◽  
Vol 577 ◽  
Author(s):  
A. Gavrin ◽  
C. Sellers ◽  
S.H. Liouw
Keyword(s):  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Magnetic Measurements ◽  
Magnetic Domain ◽  
Domain Size ◽  
High Coercivity ◽  
Uniform Domain ◽  
Cross Sectional ◽  
Force Microscopy ◽  
Melt Spun

ABSTRACTWe have used Magnetic Force Microscopy (MFM) to study the magnetic domain structures of melt-spun Nd-Fe-B ribbons. The ribbons are commercial products (Magnequench International, Inc. MQP-B and MQP-B+) with a thickness of approximately 20 microns. These materials have identical composition, Nd12.18B5.36Fe76.99Co5.46, but differ in quenching conditions. In order to study the distribution of domain sizes through the ribbon thickness, we have prepared cross-sectional samples in epoxy mounts. In order to avoid artifacts due to tip-sample interactions, we have used high coercivity CoPt coated MFM tips. Our studies show domain sizes typically ranging from 50-200 nm in diameter. This is in agreement with studies of similar materials in which domains were investigated in the plane of the ribbon. We also find that these products differ substantially in mean domain size and in the uniformity of the domain sizes as measured across the ribbon. While the B+ material shows nearly uniform domain sizes throughout the cross section, the B material shows considerably larger domains on one surface, followed by a region in which the domains are smaller than average. This structure is presumably due to the differing quench conditions. The region of coarse domains varies in thickness, disappearing in some areas, and reaching a maximum thickness of 2.75 µm in others. We also describe bulk magnetic measurements, and suggest that.

scholarly journals Heat Treatment Effect on Magnetic Microstructure of Fe73.9Cu1Nb3Si13.2B8.9 Thin Films

2018 ◽  
Vol 185 ◽  
pp. 04001
Author(s):  
Evgeniya Mikhalitsyna ◽  
Ivan Zakharchuk ◽  
Ekaterina Soboleva ◽  
Pavel Geydt ◽  
Vasiliy Kataev ◽  
...  
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Amorphous State ◽  
Magnetic Domain ◽  
Domain Size ◽  
Magnetic Domains ◽  
Magnetic Microstructure ◽  
Glass Substrates ◽  
Radio Frequency Sputtering ◽  
Anisotropy Model

Fe73.9Cu1Nb3Si13.2B8.9 (Finemet) thin films were deposited on the glass substrates by means of radio frequency sputtering. The films thickness was varied from 10 to 200 nm. Heat treatment at temperatures of 350, 400 and 450 °C were performed for 30 minutes in order to control thin film structural state. The X-ray powder diffractometry revealed that the crystallization of α-FeSi nanograins took place only at 450 °C whilst the other samples stayed in the amorphous state. Relation between the structure and magnetic properties of the films was discussed in the framework of random magnetic anisotropy model and the concept of stochastic magnetic domains. The latter was investigated using magnetic force microscopy (MFM). MFM data showed formation of such magnetic domains only in samples thermally treated at 450 °C. There was a tendency of the magnetic domain size reduction with the thickness decrease.

Magnetic Domain Imaging of Epitaxial thin Films by Spin-Polarized Scanning Electron Microscopy

1991 ◽  
Vol 231 ◽  
Author(s):  
R. Allenspach ◽  
M. Stampanoni
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Domain ◽  
Domain Size ◽  
Epitaxial Thin Films ◽  
Continuous Rotation ◽  
Spin Polarized ◽  
Out Of Plane ◽  
Micrometer Size ◽  
Scanning Electron

AbstractThe formation of magnetic domains in thin epitaxial Co/Au(111) films is investigated by spin-polarized scanning electron microscopy. Three-monolayer films are shown to decay into out-of-plane domains of micrometer size. The transition from out-of-plane to in-plane magnetization at a crossover thickness of 4.5 layers is followed by imaging the domains, and the transition is shown to occur as a continuous rotation of the magnetization. The domain size in field-free-grown perpendicular films depends linearly on film thickness. From high-resolution line scans across magnetization reversals we determine the resolution in magnetic imaging to be better than 40 nm.

scholarly journals Transmission Electron Microscopy Study of Magnetic Domain of Cobalt-Samarium Thin Films Fabricated Using DC Magnetron Sputtering Technique

2016 ◽  
Vol 1 ◽  
Author(s):  
Erwin Amiruddin
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Magnetron Sputtering ◽  
Magnetic Domain ◽  
Domain Size ◽  
Microscopy Study ◽  
Dc Magnetron Sputtering ◽  
Transmission Electron ◽  
High Loop

<p>Alloys of cobalt samarium (Co-Sm) in the form of thin films were fabricated using dc magnetron sputtering technique. The films were fabricated as a function of samarium concentration ranging from 0 to 28 at.% in order to investigate the relationship between microstructure, coercivity and magnetic domain structure. Magnetic domain structures in the films have been studied by Lorentz microscopy using transmission electron microscopy (TEM). In this technique, the TEM was operated in the defocused mode. The results show that the magnetic image of Co<sub>90</sub>Sm<sub>10 </sub>film has fairly coarse structure with magnetization ripple and the domains ranging over 200-300 nm. The domain size is much larger than the grain size of Co<sub>90</sub>Sm<sub>10</sub> film. The “multiparticle” or interaction domains suggested that there is strong exchange coupling between the magnetization of the neighbouring grains inside each of them. The hysteresis loop for this film shows a small coercivity with high magnetization value and high loop squareness, indicating a greater proportion of magnetic material. </p>

Metal–oxide films with magnetically-modulated nanoporous architectures

2001 ◽  
Vol 16 (6) ◽  
pp. 1686-1693 ◽  
Author(s):  
Craig A. Grimes ◽  
R. Suresh Singh ◽  
Elizabeth C. Dickey ◽  
Oomman K. Varghese
Keyword(s):  
Magnetic Field ◽  
Metal Oxide ◽  
Coming Out ◽  
Domain Walls ◽  
Substrate Surface ◽  
Sol Gel ◽  
Oxide Films ◽  
Magnetic Domain ◽  
Domain Size ◽  
Metal Oxide Films

A magnetically-driven method for controlling nanodimensional porosity in sol-gel-derived metal–oxide films, including TiO2, Al2O3, and SnO2, coated onto ferromagnetic amorphous substrates, such as the magnetically-soft Metglas1 alloys, is described. On the basis of the porous structures observed dependence on external magnetic field, a model is suggested to explain the phenomena. Under well-defined conditions it appears that the sol particles coming out of solution, and undergoing Brownian motion, follow the magnetic field lines oriented perpendicularly to the substrate surface associated with the magnetic domain walls of the substrate; hence the porosity developed during solvent evaporation correlates with the magnetic domain size.

Paleomagnetism and tectonics from the late Pliocene to late Pleistocene in the Xalapa monogenetic volcanic field, Veracruz, Mexico

2019 ◽  
Vol 131 (9-10) ◽  
pp. 1581-1590 ◽  
Author(s):  
L.M. Alva-Valdivia ◽  
A. Agarwal ◽  
B. García-Amador ◽  
W. Morales-Barrera ◽  
K.K. Agarwal ◽  
...  
Keyword(s):  
Magnetic Domain ◽  
Volcanic Belt ◽  
Domain Size ◽  
Volcanic Field ◽  
Magnetic Mineralogy ◽  
Monogenetic Volcanic Field ◽  
The Past ◽  
Mexican Volcanic Belt ◽  
Reflected Light

Abstract The Xalapa monogenetic volcanic field, Veracruz, Mexico is located at the eastern end of the Trans-Mexican Volcanic Belt. This study uses specimens from 0.8 ka to 5.96 ± 0.156 Ma Xalapa lava deposits and from 4.5 ± 0.028 Ma La Concha ignimbrite. The study identifies the magnetic mineralogy by reflected light microscopy, thermomagnetic curves, and coercivity estimates. It further defines the magnetic domain size distribution by hysteresis plots, Day diagrams, and first-order-reversal-curves. Characteristic remanent directions and virtual geomagnetic poles are also calculated. The characteristic remanent directions are used to establish the magnetostratigraphy and to identify the net rotation experienced, at each site, since the emplacement. The results allow the identification of the rotation domains, and R′-, P-, and Y-shears, active since the past ∼2.5 m.y. in the region and a better characterization of the displacement along the Río Actopan fault, active in the Xalapa monogenetic volcanic field.

Influence of Annealing on the Magnetic Properties of Fe50Co50 Films

2008 ◽  
Vol 47-50 ◽  
pp. 1084-1087
Author(s):  
Ya Qin Li ◽  
Ge Xin Guo ◽  
Li Wang ◽  
Xiu Ling Li
Keyword(s):  
Magnetic Properties ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Magnetic Domain ◽  
Domain Size ◽  
Magnetic Films ◽  
Scanning Probe ◽  
Glass Substrates ◽  
Domain Structures ◽  
Probe Microscope

The Fe50Co50 magnetic films were prepared by magnetron sputtering onto glass substrates. The structural and magnetic properties of the films were investigated as a function of annealing temperature and annealing time. It is found that the films have the better crystallization orientation after annealing. The in-plane coercivity Hc reduces with increasing annealing temperature and annealing time. Coercivity reaches the minimum in the sample annealed at 600°C for 2h. Meanwhile, the saturation magnetization Ms increases with increasing annealing temperature as a whole. A scanning probe microscope was used to scan surface morphology and magnetic domain structures. After annealing, the domain size becomes larger and the contrast of domains increases.

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