Magnetic properties, domain structure, and microstructure of anisotropic SmCo6.5Zr0.5 ribbons with C addition

2001 ◽  
Vol 16 (3) ◽  
pp. 629-632 ◽  
Author(s):  
A-Ru Yan ◽  
Zhi-Gang Sun ◽  
Wen-Yong Zhang ◽  
Hong-Wei Zhang ◽  
Bao-Gen Shen
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Magnetic Force ◽  
Domain Walls ◽  
Magnetic Measurement ◽  
Scanning Electron Micrographs ◽  
X Ray Diffraction ◽  
Easy Magnetization ◽  
Force Microscopy ◽  
Ribbon Plane

The magnetic properties and the domain structure of anisotropic melt-spun SmCo6.5Zr0.5 alloys with C addition was investigated by means of x-ray diffraction (XRD), magnetic measurement, and magnetic force microscopy. The XRD analyses showed that the addition of a few percent of C led to a significant increase in the coercivity and simultaneously affected the characterization of crystalline texture of the ribbons. The easy magnetization c axis changed from parallel to the ribbon plane for SmCo6.5Zr0.5 ribbons to normal to the ribbon plane for SmCo6.5Zr0.5C0.25−0.75 ribbons. An optimal coercivity of 0.92 T was obtained for the SmCo6.5Zr0.5C0.5 ribbon spun at 5 m/s. The corresponding remanence measured normal or parallel to the ribbon plane was 7.1 kGs or 3.1 kGs, respectively. The domain structure was studied by magnetic force microscopey. A strip-shaped domain was observed on the surface of the SmCo6.5Zr0.5 ribbons and the walls lay straight and parallel. For C-doped ribbons, the domain walls formed a maze domain pattern of grains with c axis normal to the ribbon plane. Scanning electron micrographs showed that a dendrite structure was present in the SmCoZr ribbon surface, and C addition caused the above-mentioned dendrite to diminish.

scholarly journals Влияние ионного облучения на магнитные свойства пленок CoPt

2021 ◽  
Vol 63 (3) ◽  
pp. 324
Author(s):  
И.Л. Калентьева ◽  
О.В. Вихрова ◽  
Ю.А. Данилов ◽  
А.В. Здоровейщев ◽  
М.В. Дорохин ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Remanent Magnetization ◽  
Domain Walls ◽  
Ion Irradiation ◽  
Electron Beam Evaporation ◽  
Force Microscopy ◽  
Circular Domains ◽  
Anti Stokes ◽  
The Magnetic Field

The possibility of using He+ ion implantation with an energy of 20 keV for modifying the domain structure and magnetic properties of CoPt films formed by electron beam evaporation with different compositions - Co0.45Pt0.55 and Co0.35Pt0.65 - has been investigated. For the irradiated CoPt samples of both compositions, a decrease in the coercivity (narrowing of the hysteresis loop on the magnetic field dependences of the Faraday angle and magnetization) with an increase in the He+ ion fluence from 2×1014 to 4×1014 cm−2 was found. In this case, the remanent magnetization of the Co0.35Pt0.65 films coincides with the value of saturation magnetization, while for Co0.45Pt0.55, a decrease in the remanent magnetization is observed. Magnetic force microscopy has shown that for the Co0.45Pt0.55 alloy, with an increase in the ion fluence up to 3 × 1014 cm−2, the largest number of isolated circular domains (skyrmions) is formed, while for He+ irradiation with a fluence of 4×1014 cm−2 for Co0.35Pt0.65, in addition to isolated circular domains, 360-degree domain walls (1D skyrmions) are observed. At the same time, the study of CoPt films by the Mandelstam-Brillouin spectroscopy method revealed an increase in the shift between the Stokes and anti-Stokes components of the spectrum and thus a significant increase of the Dzyaloshinsky-Moriya interaction for the irradiated samples. Simulation using the SRIM software showed that the applied ion irradiation causes the asymmetric mixing of Co and Pt atoms and thus, this may underlie the mechanism of the of the ion irradiation on magnetic properties and domain structure in CoPt films.

scholarly journals Влияние текстуры на ширину доменов в спеченных магнитах (PrDy)(FeCo)B и (NdDy)(FeCo)B

2019 ◽  
Vol 61 (11) ◽  
pp. 2084
Author(s):  
А.И. Безверхний ◽  
О.В. Коплак ◽  
Р.А. Валеев ◽  
Д.В. Королев ◽  
В.П. Пискорский ◽  
...  
Keyword(s):  
Grain Size ◽  
Domain Structure ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Shear Plane ◽  
Projection Area ◽  
Easy Magnetization ◽  
Force Microscopy ◽  
Main Factors ◽  
Microscopy Images

AbstractWe analyzed magnetic force microscopy images of the surface of samples cut parallel and perpendicular to the texture created by applying a field in the process of pressing a magnet. The distribution of the linear size (width) of the domains correlates with the distribution of the projection area of grains onto the shear plane in sintered (PrDy)(FeCo)B magnets with radial magnetization and in prismatic (NdDy)(FeCo)B magnets. The effects of grain size and direction of the axes of easy magnetization of grains on the width of the domains, as the main factors controlling the domain structure, are discussed.

scholarly journals Модифицирование магнитных свойств сплава CoPt путем ионного облучения

2019 ◽  
Vol 61 (9) ◽  
pp. 1694
Author(s):  
И.Л. Калентьева ◽  
О.В. Вихрова ◽  
Ю.А. Данилов ◽  
М.В. Дорохин ◽  
Ю.А. Дудин ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Ion Irradiation ◽  
Electron Beam Evaporation ◽  
Easy Magnetization ◽  
Brillouin Spectroscopy ◽  
Force Microscopy ◽  
Magnetic Skyrmions ◽  
Planar Component

The effect of ion irradiation on the magnetic properties of films of the ferromagnetic CoPt alloy made by the method of electron beam evaporation is investigated. It has been established that with an increase in the He+ ion fluence from 1×1013 to 1×1016 cm-2, a decrease in the coercive field and an increase in the planar component of the axis of easy magnetization are observed. Using magnetic force microscopy and Mandel'shtam-Brillouin spectroscopy, it was shown that with certain ion fluence (3 × 1014 cm-2), the formation of isolated round domains representing magnetic skyrmions is observed in the CoPt layer.

Domain structure of iron single crystals grown on Si(111) investigated by magnetic force microscopy (abstract)

1996 ◽  
Vol 79 (8) ◽  
pp. 6447 ◽  
Author(s):  
S. Foss ◽  
R. Proksch ◽  
K. Moloni ◽  
E. D. Dahlberg ◽  
Y. Cheng
Keyword(s):  
Single Crystals ◽  
Domain Structure ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Force Microscopy

The Domain Structure of Die-Upset Anisotropic Magnet Based On Nd-(Fe, Co)-B Alloy

2011 ◽  
Vol 56 (1) ◽  
pp. 159-161 ◽  
Author(s):  
D. Płusa ◽  
M. Dośpial ◽  
D. Derewnicka-Krawczyńska ◽  
P. Wieczorek ◽  
U. Kotlarczyk
Keyword(s):  
Domain Structure ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Magnetic Domain ◽  
Magnetic Interaction ◽  
Dipolar Interaction ◽  
Vibrating Sample Magnetometer ◽  
Force Microscopy ◽  
Interaction Domains ◽  
Anisotropic Magnet

The Domain Structure of Die-Upset Anisotropic Magnet Based On Nd-(Fe, Co)-B Alloy The measurements of the recoil curves for the die-upset Nd-(Fe, Co)-B based magnets from different points on the magnetization and demagnetization curves have been carried out by means of the LakeShore vibrating sample magnetometer in an applied magnetic fields up to 2 T. From the recoil curves the so-called Wohlfarth's remanence relationship has been derived. From this it was deduced that the magnetic interaction existing between the magnet grains has a dipolar nature. The existence of the magnetic interaction has been confirmed by magnetic domain observations by using the magnetic force microscopy (MFM). In the area of interaction domains there is the fine scale magnetic contrast resulting from the dipolar interaction between neighboring grains.

scholarly journals Visualization of magnetostructural transition in Heusler alloys by Magnetic Force Microscopy

2018 ◽  
Vol 185 ◽  
pp. 05004
Author(s):  
Pavel Geydt ◽  
Igor D. Rodionov ◽  
Alexander B. Granovsky ◽  
Ekaterina Soboleva ◽  
Egor Fadeev ◽  
...  
Keyword(s):  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Domain Walls ◽  
Heusler Alloys ◽  
Scanning Probe ◽  
Magnetic Domains ◽  
Magnetic Signal ◽  
Force Microscopy ◽  
Magnetostructural Transition ◽  
Probe Microscope

Magnetostructural transition was observed in Ni-Mn-In-Cr Heusler alloy with help of Magnetic Force Microscopy (MFM). The crystal structure of a sample and characteristic temperatures of the phase transition were controlled by roentgenostructural phase analysis and magnetometry, respectively. It appeared prominently important to prepare the surface of the sample until the nanometer level of surface roughness. Magnetic study performed with scanning probe microscope revealed existence of magnetic domains, which were spread across the surface evenly. Further studies revealed that intensity of magnetic signal decreases as fading out of the contrast of the MFM images. It was found that location of domains shifted after the heating/cooling cycle above Curie temperature for the studied alloy. Location of new domain walls appeared correlating with surface scrapings and defects, whilst it became independent from those after heating until just 70°C. The mechanism behind the observed transition is proposed.

scholarly journals Structure and Dynamics of Ferroelectric Domains in Polycrystalline Pb(Fe1/2Nb1/2)O3

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1327 ◽  
Author(s):  
Ursic ◽  
Bencan ◽  
Prah ◽  
Dragomir ◽  
Malic
Keyword(s):  
Domain Wall ◽  
Ambient Temperature ◽  
Domain Structure ◽  
Domain Walls ◽  
Domain Switching ◽  
Piezoresponse Force Microscopy ◽  
Paraelectric Phase Transition ◽  
Force Microscopy ◽  
Ferroelectric Domains

A complex domain structure with variations in the morphology is observed at ambient temperature in monoclinic Pb(Fe1/2Nb1/2)O3. Using electron microscopy and piezoresponse force microscopy, it is possible to reveal micrometre-sized wedge, lamellar-like, and irregularly shaped domains. By increasing the temperature, the domain structure persists up to 80 °C, and then starts to disappear at around 100 °C due to the proximity of the ferroelectric–paraelectric phase transition, in agreement with macroscopic dielectric measurements. In order to understand to what degree domain switching can occur in the ceramic, the mobility of the domain walls was studied at ambient temperature. The in situ poling experiment performed using piezoresponse force microscopy resulted in an almost perfectly poled area, providing evidence that all types of domains can be easily switched. By poling half an area with 20 V and the other half with −20 V, two domains separated by a straight domain wall were created, indicating that Pb(Fe1/2Nb1/2)O3 is a promising material for domain-wall engineering.

Effect of strain and growth morphology on the evolution of the domain structure of ferromagnetic manganites

2004 ◽  
Vol 819 ◽  
Author(s):  
Holly Miller ◽  
J. S. Higgins ◽  
Y. Mukovskii ◽  
R. L. Greene ◽  
Amlan Biswas
Keyword(s):  
Curie Temperature ◽  
Domain Structure ◽  
Strain Distribution ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Growth Morphology ◽  
Surface Magnetism ◽  
Two Phase ◽  
Force Microscopy ◽  
Magnetic Nanodots

AbstractThe effect of strain on the surface magnetism of the manganite La0.7Sr0.3MnO3 has been studied as a function of temperature, using magnetic force microscopy. The non- uniform strain distribution in the film leads to a two-phase coexistence between ferromagnetic and non-ferromagnetic phases. This leads to a reduction of the surface curie temperature and the formation of ferromagnetic islands. Methods of controlling this behavior in order to fabricate arrays of magnetic nanodots are discussed.

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