scholarly journals Dip-Pen Nanolithography Method for Fabrication of Biofunctionalized Magnetic Nanodiscs Applied in Medicine

2018 ◽  
Vol 52 (5) ◽  
pp. 528
Author(s):  
T.E. Smolyarova ◽  
A.V. Lukyanenko ◽  
A.S. Tarasov ◽  
A.E. Sokolov
Keyword(s):  
Magnetic Properties ◽  
Cancer Cell ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Theoretical Calculations ◽  
Experimental Results ◽  
Magnetization Distribution ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dip Pen Nanolithography

AbstractThe magnetic properties of ferromagnetic nanodiscs coated with gold, manufactured using the Dip-Pen Nanolithography method, and were studied by atomic-force and magnetic force microscopy methods. The magnetic discs (dots) are represented as nanoagents (nanorobots) applied in medicine for the cancer cell destruction. The motivation of this work stem from the necessity of the understanding of the magnetization distribution in ferromagnetic discs that is crucial for their application in biomedicine. We have performed the theoretical calculations in order to compare the theoretical image contrast to experimental results. Herein, we report about the fabrication and analysis of biocompatible ferromagnetic nanodiscs with the homogenous magnetized state.

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 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.

scholarly journals Распределение намагниченности в частицах с конфигурационной анизотропией, полученных методом микросферной литографии

2019 ◽  
Vol 89 (11) ◽  
pp. 1742
Author(s):  
Д.А. Бизяев ◽  
А.А. Бухараев ◽  
Н.И. Нургазизов ◽  
А.П. Чукланов ◽  
В.М. Масалов
Keyword(s):  
Computer Simulation ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Scanning Probe ◽  
Magnetization Distribution ◽  
Scanning Probe Lithography ◽  
Force Microscopy ◽  
Lithography Process ◽  
Atomic Force ◽  
Lithography Technique

The arrays of permalloy micron-sized particles with configurational anisotropy of shape was made by microsphere lithography technique. The properties of the particles were studied by atomic-force microscopy and magnetic-force microscopy. The magnetization distribution in particles was studied depending on the size of microspheres used in lithography process. The computer simulation of magnetic-force images of the particles was carried out. The quantitative and qualitative comparisons of shapes, sizes and reproducibility of particles fabricated by microsphere lithography and scanning probe lithography was performed.

scholarly journals Subsurface imaging of flexible circuits via contact resonance atomic force microscopy

2019 ◽  
Vol 10 ◽  
pp. 1636-1647 ◽  
Author(s):  
Wenting Wang ◽  
Chengfu Ma ◽  
Yuhang Chen ◽  
Lei Zheng ◽  
Huarong Liu ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Theoretical Calculations ◽  
Contact Stiffness ◽  
Metal Layer ◽  
Experimental Results ◽  
Subsurface Imaging ◽  
Force Microscopy ◽  
Atomic Force ◽  
Cover Thickness ◽  
Contact Resonance

Subsurface imaging of Au circuit structures embedded in poly(methyl methacrylate) (PMMA) thin films with a cover thickness ranging from 52 to 653 nm was carried out by using contact resonance atomic force microscopy (CR-AFM). The mechanical difference of the embedded metal layer leads to an obvious CR-AFM frequency shift and therefore its unambiguous differentiation from the polymer matrix. The contact stiffness contrast, determined from the tracked frequency images, was employed for quantitative evaluation. The influence of various parameter settings and sample properties was systematically investigated by combining experimental results with theoretical analysis from finite element simulations. The results show that imaging with a softer cantilever and a lower eigenmode will improve the subsurface contrast. The experimental results and theoretical calculations provide a guide to optimizing parameter settings for the nondestructive diagnosis of flexible circuits. Defect detection of the embedded circuit pattern was also carried out, which indicates the capability of imaging tiny subsurface structures smaller than 100 nm by using CR-AFM.

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.

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 Films of Cobalt/Aluminum Electrodeposited from the Room Temperature Molten Salts AlCl3-BPC-CoCl2

2004 ◽  
Vol 59 (5) ◽  
pp. 519-524 ◽  
Author(s):  
Chao-Chen Yang ◽  
Te-Ho Wu ◽  
Min-Fong Shu
Keyword(s):  
Thin Films ◽  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Current Method ◽  
Magnetic Films ◽  
Deposition Potential ◽  
Force Microscopy ◽  
Atomic Force ◽  
Increasing Temperature

Abstract The electric conductivities of molten mixtures of aluminum chloride-butylpyridinium chloridecobalt chloride (AlCl3-BPC-CoCl2) were measured using a computerized direct-current method. The conductivities of all the melts increased with increasing temperature. The electrodeposition of Co/Al films from the AlCl3-BPC melt containing a small amount of CoCl2 has been studied by cyclic voltammetry. Compact and smooth Co/Al thin films could be obtained at a deposition potential of −0.4 V. The surface morphology and the composition of the electrodeposited thin films were studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The magnetic properties of the deposited thin films have been investigated via magnetic force microscopy (MFM) and vibrating sample magnetometry (VSM). Higher magnetization and smooth domains of Co/Al layers could be obtained at the deposition potentials of −0.1 V and −0.4 V, respectively.

Atomic Force Microscopy Probe with Integrated Loop and Shielded Leads for Micromagnetic Sensing

2005 ◽  
Vol 872 ◽  
Author(s):  
D.P. Lagally ◽  
A. Karbassi ◽  
Y. Wang ◽  
C.A. Paulson ◽  
D. W. van der Weide
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
High Spatial Resolution ◽  
Magnetic Moments ◽  
Chemical Species ◽  
Magnetic Resonance Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Magnetic Resonance Imaging Mri

The effort to produce an instrument that can achieve high spatial resolution, nondestructive, surface and sub-surface imaging for a variety of materials comes with many challenges. One approach, magnetic resonance-force microscopy (MRFM), lies at the nexus of two sensitive technologies: magnetic force microscopy (MFM) and magnetic resonance imaging (MRI). MFM uses a magnetic tip in a standard atomic force microscope (AFM) to obtain magnetic information about a surface. A difference in the magnetic moments of surface atoms in different regions on the surface varies the cantilever resonance. MRI, on the other hand, uses the spin states of magnetically biased atoms to differentiate between chemical species.

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