scholarly journals SEM and AFM Studies of Two-Phase Magnetic Alkali Borosilicate Glasses

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
N. Andreeva ◽  
M. Tomkovich ◽  
A. Naberezhnov ◽  
B. Nacke ◽  
A. Filimonov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Necessary Condition ◽  
Borosilicate Glasses ◽  
Two Phase ◽  
Force Microscopy ◽  
Treatment Processes ◽  
Atomic Force ◽  
First Results ◽  
Magnetic Glasses ◽  
Alkali Borosilicate Glasses

The morphology and composition of four types of two-phase alkali borosilicate glasses with magnetic atoms prepared by inductive melting have been studied. The results of scanning electron microscopy point to uniform distribution of Na, Si, and O atoms in these samples while magnetic iron atoms form ball-shaped agglomerates. The magnetic properties of these agglomerates have been confirmed by magnetic force microscopy. Atomic force microscopy had shown that in these samples two different morphological structures, drop-like and dendrite net, are formed. The formation of dendrite-like structure is a necessary condition for production of porous magnetic glasses. The obtained results allow us to optimize the melting and heat treatment processes leading to production of porous alkali borosilicate glasses with magnetic properties. The first results for nanocomposite materials on the basis of magnetic glasses containing the embedded ferroelectrics KH2PO4 demonstrate the effect of applied magnetic field on the ferroelectric phase transition.

scholarly journals Morphology and Magnetic Properties of Ferriferous Two-Phase Sodium Borosilicate Glasses

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Alexander Naberezhnov ◽  
Nadezda Porechnaya ◽  
Viktor Nizhankovskii ◽  
Alexey Filimonov ◽  
Bernard Nacke
Keyword(s):  
Magnetic Properties ◽  
Iron Oxides ◽  
Channel Structure ◽  
Borosilicate Glasses ◽  
Melt Quenching ◽  
Two Phase ◽  
Furnace Charge ◽  
Self Assembling ◽  
Quenching Method ◽  
Drop Structure

This contribution is devoted to the study of morphology and magnetic properties of sodium borosilicate glasses with different concentrations (15, 20, and 25 wt.%) ofα-Fe2O3in an initial furnace charge. These glasses were prepared by a melt-quenching method. For all glasses a coexistence of drop-like and two-phase interpenetrative structures is observed. The most part of a drop structure is formed by self-assembling iron oxides particles. All types of glasses demonstrate the magnetic properties and can be used for preparation of porous magnetic matrices with nanometer through dendrite channel structure.

scholarly journals Structural, chemical and magnetic properties of nickel vertical posts obtained by glancing angle deposition technique

2017 ◽  
Vol 49 (1) ◽  
pp. 73-79
Author(s):  
Jelena Potocnik ◽  
Milos Nenadovic ◽  
Bojan Jokic ◽  
Maja Popovic ◽  
Zlatko Rakocevic
Keyword(s):  
Thin Film ◽  
Magnetic Properties ◽  
Photoelectron Spectroscopy ◽  
Glancing Angle Deposition ◽  
Deposition Technique ◽  
Force Microscopy ◽  
Atomic Force ◽  
Glancing Angle ◽  
Magneto Optical Kerr Effect ◽  
Angle Deposition

In this work, Glancing Angle Deposition technique was used for obtaining nanostructured nickel thin film with vertical posts on glass substrate which was positioned 75 degrees with respect to the substrate normal and rotated with a suitable constant speed. The obtained nickel thin film was characterized by Scanning Electron Microscopy, Atomic Force Microscopy and X-ray Photoelectron Spectroscopy. It was found that the deposited thin film consists of 94.0 at.% of nickel. Magnetic properties of the deposited thin film were determined by Magneto-Optical Kerr Effect Microscopy. According to the obtained coercivity values, it can be concluded that the nickel thin film shows uniaxial magnetic anisotropy.

Magnetic Properties of Two-Phase Borosilicate Glasses Containing β-Fe2O3 and Fe3O4 Nanoparticles

2020 ◽  
Vol 46 (8) ◽  
pp. 808-811
Author(s):  
S. A. Borisov ◽  
A. A. Naberezhnov ◽  
B. Nacke ◽  
A. Nikanorov
Keyword(s):  
Magnetic Properties ◽  
Fe3o4 Nanoparticles ◽  
Borosilicate Glasses ◽  
Two Phase

scholarly journals Магнитные свойства двухфазных магнитных боросиликатных стекол, содержащих наночастицы beta-Fe-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- и Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-

2020 ◽  
Vol 46 (16) ◽  
pp. 28
Author(s):  
С.А. Борисов ◽  
А.А. Набережнов ◽  
B. Nacke ◽  
A. Nikanorov
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Fe3o4 Nanoparticles ◽  
Superparamagnetic Nanoparticles ◽  
Blocking Temperature ◽  
Neel Temperature ◽  
Specific Magnetization ◽  
Borosilicate Glasses ◽  
Néel Temperature ◽  
Two Phase

The magnetic properties of two-phase borosilicate glasses containing in the skeleton a mixture of β-Fe2O3 and Fe3O4 nanoparticles have been studied. The sizes of nanoparticles have been determined, the value of blocking temperature (TB ~ 330 K) for ensemble of superparamagnetic nanoparticles is obtained. It is shown that in the high applied magnetic fields the specific magnetization of these glasses increases sharply at approaching and below Neel temperature for the bulk β-Fe2O3.

Theoretical and experimental investigation of the particle size distribution and magnetic properties of the PP + FE3O4nanocomposites

2019 ◽  
Vol 33 (1) ◽  
pp. 125-137
Author(s):  
Mahammadali A Ramazanov ◽  
Abel M Maharramov ◽  
Rasim A Ali-zada ◽  
Habiba A Shirinova ◽  
Flora V Hajiyeva
Keyword(s):  
Magnetic Properties ◽  
Size Distribution ◽  
Polymer Matrix ◽  
Theoretical Calculations ◽  
Mixing Time ◽  
Magnetic Hysteresis ◽  
Force Microscopy ◽  
Atomic Force ◽  
The Matrix ◽  
Scanning Electron

A detailed study of the dispersion of magnetite (Fe3O4) nanoparticles in the polypropylene (PP) matrix, the degree of coagulation, and the dependence of magnetic properties of PP + Fe3O4nanocomposites on the size of nanoparticles is reported. The size distribution of nanoparticles in polymer matrix and morphology of the nanocomposites were studied by the means of scanning electron microscope (JEOL JSM-7600 F) and atomic force microscopy (NT-MDT). It was found that when the Fe3O4nanoparticles are introduced into the PP matrix, their coagulation takes place. The increase in the size of the Fe3O4nanoparticles depends on their volume content in the polymer matrix, the viscosity of polymer, mixing time, and so on. The magnetic properties of PP + Fe3O4nanocomposites were experimentally and theoretically studied. It was found that the magnetic hysteresis parameters of the nanocomposites directly depend on the size and concentration of the Fe3O4nanoparticles in the matrix. Theoretical calculations were compared with experimental results obtained from M( H) measurements. Discrepancy between theoretical and experimental magnetic values have been explained.

MAGNETIC PROPERTIES OF Co-FERRITE AND SiO2-DOPED Co-FERRITE THIN FILMS AND POWDERS BY SOL–GEL

2004 ◽  
Vol 03 (04n05) ◽  
pp. 463-470
Author(s):  
Y. C. WANG ◽  
J. DING ◽  
B. H. LIU ◽  
Y. SHI
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Structural And Magnetic Properties ◽  
Ferrite Thin Films ◽  
Scanning Electron

Thin films and powders of Co -ferrite and SiO 2-doped Co -ferrite were fabricated via the sol–gel method. The structural and magnetic properties of the films and powders were investigated with X-Ray Diffractometer (XRD), Vibrating Sample Magnetometer (VSM), Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). VSM measurements showed an enhancement of coercivity by SiO 2-doping for Co -ferrite powders and thin films (coercivity of 3.5 kOe in SiO 2-doped thin films). XRD and SEM investigations revealed a nanostructure of the thin films. Low surface roughness was observed in our AFM study.

scholarly journals In Situ Initial Growth Studies of (Sr, Ca)CuO2 ON SrTiO3 by High Pressure Rheed

1997 ◽  
Vol 502 ◽  
Author(s):  
Gertjan Koster ◽  
Guus J. H. M. Runders ◽  
Dave H. A. Blank ◽  
Horst Rogalla
Keyword(s):  
High Pressure ◽  
Pulsed Laser ◽  
High Energy ◽  
Initial Growth ◽  
Force Microscopy ◽  
Atomic Force ◽  
Growth Studies ◽  
Layer Structures ◽  
First Results

ABSTRACTThe initial growth of pulsed laser deposited SrCuO2 (SCO) and CaCuO2 (CCO) on SrTiO3 has been studied using high pressure Reflection High Energy Electron Diffraction (RHEED) and Atomic Force Microscopy (AFM). For this, we developed a Pulsed Laser Deposition (PLD)- RHEED system, with the possibility to study the growth and to monitor the growth rates, in situ, at typical PLD pressures (10–50 Pa). In case of depositing oxide materials, high oxygen pressures are desired. Moreover, crystallinity can be improved using higher oxygen pressures and therefore higher temperatures. With this technique we are able to obtain atomically flat films, a first step towards multi-layer structures.In this paper we present the initial growth studies of SCO and first results incorporating CCO layers in a SCO matrix.

Atomic Force Probe of Mesoscopic Dielectric and Viscoelastic Fluctuations Near the Glass Transition

1996 ◽  
Vol 455 ◽  
Author(s):  
L. E. Walther ◽  
N. E. Israeloff
Keyword(s):  
Glass Transition ◽  
Viscoelastic Properties ◽  
Variable Temperature ◽  
Force Microscopy ◽  
Glass Forming ◽  
Atomic Force ◽  
Large Fluctuations ◽  
Modulation Techniques ◽  
First Results ◽  
Piezoresistive Cantilevers

ABSTRACTWe report a new experimental approach to study the glass transition and glassy dynamics on a mesoscopic scale. Non contact atomic force microscopy is employed to measure dielectric fluctuations of glass forming polymers such as PVAc. Force modulation techniques, performed with the same instrument, allow us to study viscoelastic properties. A custom-built variable temperature UHV AFM with exceptional thermal stability utilizing piezoresistive cantilevers was used. First results on PVAc include large fluctuations of the viscoelastic properties as a function of applied stress below the glass transition.

Heat Treatment Processes of A2024 Rheoforging Alloy and Morphology Investigation by Nanoindentation and Atomic Force Microscopy

2008 ◽  
Vol 141-143 ◽  
pp. 385-390 ◽  
Author(s):  
D.S. Kim ◽  
C.G. Kang ◽  
S.M. Lee
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Atomic Force Microscopy ◽  
Aluminum Alloy ◽  
Phase Region ◽  
Force Microscopy ◽  
T6 Heat Treatment ◽  
Treatment Processes ◽  
Atomic Force ◽  
Wrought Aluminum

This study demonstrated nanoindentation techniques of investigating the effects of size and feature in a microstructure on the mechanical properties of rheology-forged aluminum alloy. Mechanical properties and tribological characteristics of rheology-forged Al2024 wrought aluminum alloy in terms of T6 heat treatment were investigated by varying the aging time by nanoindentation and nanoscratch techniques. By nanoindentation/nanoscratch tests and atomic force microscopy, it was demonstrated that the 4 hour aged material exhibites the highest hardness because of the intermediate precipitate phase θ″, which was precipitated by T6 heat treatment at 495°C. Moreover, the friction coefficients in the precipitates in the eutectic phase region were lower than those in the primary α phase region.

scholarly journals Electronic and magnetic properties of strontium ruthenate thin films

2018 ◽  
Author(s):  
Kseniia Lushcheva
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Sharp Increase ◽  
Strontium Ruthenate ◽  
Scientific Interest ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Itinerant Ferromagnet

SrRuO3 is an itinerant ferromagnet with a Curie temperature of ~160K. There has been a sharp increase in scientific interest towards this material and its intriguing features, such as its magnetic anisotropy, and anomalous transport properties which are incompatible with Drude model. In this study, several thin films of strontium ruthenate were grown and characterised in quality and quantity, employing techniques such as X-ray diffraction and atomic force microscopy. The results are presented and described as crystallographic and topographic findings; finally, based on the findings, adjustments and further study are proposed.

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