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.

Preparation and Characterization of Magnetic Force Microscopy Tips Coated with Nickel Films by e-Beam Evaporation

2018 ◽  
Vol 765 ◽  
pp. 3-7
Author(s):  
Badin Damrongsak ◽  
Samutchar Coomkaew ◽  
Karnt Saengkaew ◽  
Ittipon Cheowanish ◽  
Pongsakorn Jantaratana
Keyword(s):  
Film Thickness ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Film Surface ◽  
Electron Beam Evaporation ◽  
Film Stress ◽  
Nickel Films ◽  
Force Microscopy ◽  
Best Response ◽  
Cantilever Bending

In this work, magnetic force microscopy (MFM) tips coated with a nickel thin-film were prepared and characterized for applications in the measurement of the magnetic write field. Nickel films with various thicknesses in a range of 20 – 80 nm were deposited on silicon substrates and silicon atomic force microscopy (AFM) tips by electron beam evaporation. Film surface morphologies and magnetic properties of the coated nickel films were investigated by using AFM and vibrating sample magnetometry (VSM). The rms roughness increased with the film thickness and was in a range between 0.1 and 0.3 nm. VSM results revealed that the mean coercive field of the nickel films was 20 Oe and there was an increase in the coercivity as the film thickness increased. In addition, the prepared MFM tips were evaluated for the tip response to the dc and ac magnetic field generated from perpendicular write heads. It was found that the MFM tip had the best response to the write field when coated with 60 nm thick nickel film. The coating thickness over 60 nm was inapplicable due to the cantilever bending caused by the film stress.

scholarly journals Слоевые нанопроволоки --- матричный синтез, структура и магнитные свойства

2019 ◽  
Vol 61 (9) ◽  
pp. 1682
Author(s):  
Д.Л. Загорский ◽  
И.М. Долуденко ◽  
Д.А. Черкасов ◽  
О.М. Жигалина ◽  
Д.Н. Хмеленин ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Residual Magnetization ◽  
Magnetization Curves ◽  
Easy Magnetization ◽  
Force Microscopy ◽  
Shell Nanostructures ◽  
Magnetization Axis ◽  
Out Of Plane

AbstractNanowires (NWs) consisting of Ni/Cu and Co/Cu alternating layers with a diameter of 100 nm and layer thicknesses varying between 10 and 500 nm are prepared by template synthesis in pores of polymer track-etched membranes. Bath compositions and different regimes for pulsed electrodeposition of NWs are explored. A procedure for electrodeposition of NWs using pulses of equal charge is developed. By diminishing the amount of charge per pulse, initially we manage to lower the layer thickness to 10–15 nm, but further diminishing of charge in pulses leads to the blending of elemental composition of adjacent layers and/or formation of rod–shell nanostructures within the NWs. The coercive force (15–30 mT) and residual magnetization of our layered NWs are determined from magnetization measurements. For NWs with a layer thickness of 50–100 nm, the magnetization curves recorded in the out-of-plane and in-plane geometries are similar in shape and have similar parameters. For NWs with thicker layers (250 and 500 nm), magnetization curves are markedly different due to magnetic anisotropy (an easy magnetization axis emerges longitudinally to NWs) and interference between neighboring NWs. Magnetic force microscopy of isolated NWs identifies that the NWs comprise magnetic regions extending over ~100–150 nm. The NW can be partially remagnetized by applying an external magnetic field (+16 mT) longitudinally.

Research and development of technology for laser configuration of sensitive element of fluxgate inclinometer

2019 ◽  
pp. 85-93
Author(s):  
O. S. Yulmetova ◽  
O. N. Poslyanova ◽  
A. G. Shcherbak ◽  
M. V. Zhukov
Keyword(s):  
Magnetic Properties ◽  
Laser Treatment ◽  
Magnetic Force Microscopy ◽  
Sensitive Element ◽  
Magnetic Force ◽  
Arrhenius Equation ◽  
Air Analysis ◽  
Force Microscopy ◽  
Oxidation Processes ◽  
Kinetic Assessment

The paper presents the results of thermodynamic analysis of oxidation processes occurring during laser treatment of amorphous magnetically sensitive ribbon (71KNSR) in air and in the atmosphere of argon. Kinetic assessment of the rate of chemical reactions is based on the Arrhenius equation. The results of analytical calculations show that the decrease of magnetic properties of the alloy after laser treatment in the air is mostly determined by the formation of iron oxides Fe2O3 and Fe2O4. Chemical elemental analysis of the composition of the samples after laser configuration in argon shows a significant decrease in their composition of oxygen compared to samples configured in the air. Analysis of samples using scanning electron and magnetic force microscopy confirms the preservation of the magnetic properties after treatment in argon. The developed technology is used for the manufacture of a sensitive element of a fluxgate inclinometer.

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.

Features of Surface Morphology and Magnetic Properties of Sm0.5R0.5Fe2 (R = Tb, Gd) Compounds

2020 ◽  
Vol 312 ◽  
pp. 261-269
Author(s):  
Galina Aleksandrovna Politova ◽  
Tatiana P. Kaminskaya ◽  
Alexey Karpenkov ◽  
Nikolay Yu. Pankratov ◽  
Maksim Ganin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Magnetic Domain ◽  
Surface Topology ◽  
Partial Replacement ◽  
Force Microscopy ◽  
Atomic Force ◽  
Comprehensive Study

A comprehensive study of the structure and phase composition, magnetostrictive and magnetic properties of the (Sm0.5R0.5)Fe2 (R = Gd, Tb) compounds was performed. The effect of partial replacement of samarium by gadolinium and terbium on the microstructure of the surface, the temperature of phase transitions, the magnitude of magnetostrictive deformations and magnetization was studied. Using atomic force and magnetic force microscopy, the surface topology at the micro and nanoscale was established, and information on the magnetic domain structure at room temperature was obtained.

scholarly journals Switching Magnetization Magnetic Force Microscopy — An Alternative to Conventional Lift-Mode MFM

2011 ◽  
Vol 62 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Vladimír Cambel ◽  
Dagmar Gregušová ◽  
Peter Eliáš ◽  
Ján Fedor ◽  
Ivan Kostič ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Moment ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Switching Field ◽  
Force Microscopy ◽  
Lift Height ◽  
Domain State ◽  
Tapping Mode Afm ◽  
Sample Distance

Switching Magnetization Magnetic Force Microscopy — An Alternative to Conventional Lift-Mode MFM In the paper we present an overview of the latest progress in the conventional lift-mode magnetic force microscopy (MFM) technique, achieved by advanced MFM tips and by lowering the lift height. Although smaller lift height offers improved spatial resolution, we show that lowered tip-sample distance mixes magnetic, atomic and electric forces. We describe an alternative to the lift-mode procedure - Switching Magnetization Magnetic Force Microscopy [SM-MFM], which is based on two-pass scanning in tapping mode AFM with reversed tip magnetization between the scans. We propose design and calculate the magnetic properties of such SM-MFM tips. For best performance the tips must exhibit low magnetic moment, low switching field, and single-domain state at remanence. The switching field of such tips is calculated for Permalloy hexagons.

Magnetic properties of thin MnGe films investigated by magnetic force microscopy

2004 ◽  
Vol 272-276 ◽  
pp. E1541-E1543 ◽  
Author(s):  
P. Castrucci ◽  
N. Pinto ◽  
L. Morresi ◽  
R. Gunnella ◽  
R. Murri ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Force Microscopy

Magneto-Optical and Micromagnetic Properties of Ferromagnet/Heavy Metal Thin Film Structures

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940019
Author(s):  
A. V. Zdoroveyshchev ◽  
O. V. Vikhrova ◽  
P. B. Demina ◽  
M. V. Dorokhin ◽  
A. V. Kudrin ◽  
...  
Keyword(s):  
Thin Film ◽  
Heavy Metal ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Ferromagnetic Material ◽  
Electron Beam Evaporation ◽  
Magnetic Domains ◽  
Magnetic Phases ◽  
Force Microscopy ◽  
Optical Effects

This paper presents a comparative analysis of the magnetization, Kerr and Faraday magneto-optical effects, magnetic force microscopy measurements of CoPt, CoPd, FePd alloy thin films. The films were fabricated by electron-beam evaporation, with the variation of a ferromagnetic material content. A decrease in the size of magnetic domains with an increase of the Co content in CoPt and CoPd films is shown. The presence of two magnetic phases in the films is discussed.

scholarly journals Magnetic Imaging of Encapsulated Superparamagnetic Nanoparticles by Data Fusion of Magnetic Force Microscopy and Atomic Force Microscopy Signals for Correction of Topographic Crosstalk

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2486
Author(s):  
Marc Fuhrmann ◽  
Anna Musyanovych ◽  
Ronald Thoelen ◽  
Sibylle von Bomhard ◽  
Hildegard Möbius
Keyword(s):  
Atomic Force Microscopy ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Data Fusion ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Capacitive Coupling ◽  
Phase Image ◽  
Force Microscopy ◽  
Atomic Force

Encapsulated magnetic nanoparticles are of increasing interest for biomedical applications. However, up to now, it is still not possible to characterize their localized magnetic properties within the capsules. Magnetic Force Microscopy (MFM) has proved to be a suitable technique to image magnetic nanoparticles at ambient conditions revealing information about the spatial distribution and the magnetic properties of the nanoparticles simultaneously. However, MFM measurements on magnetic nanoparticles lead to falsifications of the magnetic MFM signal due to the topographic crosstalk. The origin of the topographic crosstalk in MFM has been proven to be capacitive coupling effects due to distance change between the substrate and tip measuring above the nanoparticle. In this paper, we present data fusion of the topography measurements of Atomic Force Microscopy (AFM) and the phase image of MFM measurements in combination with the theory of capacitive coupling in order to eliminate the topographic crosstalk in the phase image. This method offers a novel approach for the magnetic visualization of encapsulated magnetic nanoparticles.

Magnetic Force Microscopy on Co/Pt Multilayers

2009 ◽  
Vol 152-153 ◽  
pp. 241-244
Author(s):  
V. Karoutsos ◽  
Panagiotis Poulopoulos ◽  
M. Angelakeris ◽  
E.T. Papaioannou ◽  
Paul Fumagalli ◽  
...  
Keyword(s):  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Magnetic Domain ◽  
Hysteresis Loops ◽  
Electron Beam Evaporation ◽  
Film Plane ◽  
X Ray Diffraction ◽  
Saturation Field ◽  
Force Microscopy ◽  
Magneto Optic

Co/Pt multilayers reside among the best candidates for perpendicular magneto-optic recording. In this work, Co/Pt multilayers were prepared by electron-beam evaporation under ultrahigh vacuum conditions on polyimide. X-ray diffraction measurements revealed the high quality of multilayer stacking. Magneto-optic polar Kerr effect experiments were used in order to obtain magnetization hysteresis loops of the films. We have studied the magnetic-domain morphology on the surface of the films via Magnetic Force Microscopy. The field applied during these measurements was 2.3 kOe oriented perpendicular to the film plane; this field seems to stabilize and enhance out-of-plain stripe domains against in plain domains that may be expected from magnetization curves. Finally, we observed that when the applied field approaches the magnetic saturation field, then the domain morphology turns to be dominated by bubble domains.

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