Magnetic Properties of PrхY1-xFe3(BO3)4

2015 ◽  
Vol 233-234 ◽  
pp. 360-363
Author(s):  
A.I. Pankrats ◽  
A.A. Demidov ◽  
D.A. Velikanov ◽  
V.I. Tugarinov ◽  
V.L. Temerov
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Field Model ◽  
Field Approximation ◽  
Magnetization Curves ◽  
Extensive Experimental Data ◽  
Theory And Experiment ◽  
Good Agreement

The magnetic properties of trigonal PrxY1-xFe3(BO3)4 compound have been investigated. Anomalies on the magnetization curves induced by a magnetic field are observed for each composition. The calculations were performed using a molecular-field approximation and a crystal-field model for the rare-earth subsystem. Extensive experimental data on the magnetic properties of PrxY1-xFe3(BO3)4 have been interpreted and good agreement between theory and experiment has been achieved.

Magnetic Properties of Nd0.6Dy0.4Fe3(Bo3)4

2012 ◽  
Vol 190 ◽  
pp. 261-264 ◽  
Author(s):  
A.A. Demidov ◽  
I.A. Gudim ◽  
E.V. Eremin
Keyword(s):  
Magnetic Properties ◽  
Field Model ◽  
Exchange Interactions ◽  
Field Approximation ◽  
Spin Reorientation ◽  
Spin Reorientation Transition ◽  
Extensive Experimental Data ◽  
The Magnetic Field ◽  
Theory And Experiment ◽  
Good Agreement

The magnetic properties of trigonal Nd0.6Dy0.4Fe3(BO3)4 substituted compound with the competitive Nd-Fe and Dy-Fe exchange interactions have been investigated. It has been shown that in Nd0.6Dy0.4Fe3(BO3)4 a spontaneous spin-reorientation transition from an ease-axis state to an easy-plane occurs near 31 K. Anomalies of the magnetization curves are observed in a spin-flop transition induced by the magnetic field B||c. The calculations were performed using a molecular-field approximation and a crystal-field model for the rare-earth subsystem. Extensive experimental data on the magnetic properties of Nd0.6Dy0.4Fe3(BO3)4 have been interpreted and good agreement between theory and experiment has been achieved using the obtained theoretical dependences.

Quantum Theory of Magnetoelectric Properties of Rare-Earth Alumoborates: Holmium Alumoborate

2014 ◽  
Vol 215 ◽  
pp. 95-99
Author(s):  
Nadezhda V. Kostyuchenko ◽  
Alexander I. Popov ◽  
Anatoly K. Zvezdin
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Quantum Theory ◽  
Magnetoelectric Effect ◽  
Magnetoelectric Properties ◽  
Magnetization Processes

The magnetization processes of HoAl3(BO3)4rare-earth aluminum borates have been studied theoretically. Magnetic properties of the crystals were examined. The dependencies of the magnetic susceptibility on the magnitude and direction of magnetic field were calculated. Study of a magnetoelectric effect was performed and the dependencies of the polarization on the strength and orientation of a magnetic field and temperature were obtained. A comparison of the theoretical and experimental data was performed, their consistency has been ascertained.

scholarly journals Mechanics of magnetic fluid active element in strong magnetic field

2018 ◽  
Vol 185 ◽  
pp. 09005
Author(s):  
V.M. Polunin ◽  
P.A. Ryapolov ◽  
E.V. Sheldeshova
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Saturation Magnetization ◽  
Strong Magnetic Field ◽  
Magnetic Fluid ◽  
Active Element ◽  
Magnetic Levitation ◽  
Static Displacement ◽  
Temporal Dependence ◽  
Good Agreement

Measurements and theoretical analysis of the processes of static displacement and oscillations of the magnetic fluid column confined by magnetic levitation in a strong magnetic field in a horizontally placed tube are carried out. The calculations of the saturation magnetization, made on the basis of the obtained results of the displacement and the oscillation frequency for the sample of the magnetic fluid under study, are in good agreement with the experimental data. The described technique is of interest when studying saturation magnetization, magnetophoresis, aggregation of nanoparticles and their temporal dependence in magnetic colloids.

Magnetized liquid 3He at finite temperature: A variational calculation approach

2016 ◽  
Vol 30 (22) ◽  
pp. 1650129 ◽  
Author(s):  
Gholam Hossein Bordbar ◽  
Mohammad Taghi Mohammadi Sabet
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Correlation Function ◽  
Finite Temperature ◽  
Spin Correlation ◽  
Energy Functional ◽  
Variational Calculation ◽  
A Value ◽  
Dependent Correlation ◽  
Good Agreement

Using the spin-dependent (SD) and spin-independent (SI) correlation functions, we have investigated the properties of liquid [Formula: see text] in the presence of magnetic field at finite temperature. Our calculations have been done using the variational method based on cluster expansion of the energy functional. Our results show that the low field magnetic susceptibility obeys Curie law at high temperatures. This behavior is in a good agreement with the experimental data as well as the molecular field theory results in which the spin dependency has been introduced in correlation function. Reduced susceptibility as a function of temperature as well as reduced temperature has been also investigated, and again we have seen that the spin-dependent correlation function leads to a good agreement with the experimental data. The Landau parameter, [Formula: see text], has been calculated, and for this parameter, a value about [Formula: see text] has been found in the case of spin–spin correlation. In the case of spin-independent correlation function, this value is about [Formula: see text]. Therefore, inclusion of spin dependency in the correlation function leads to a more compatible value of [Formula: see text] with experimental data. The magnetization and susceptibility of liquid [Formula: see text] have also been investigated as a function of magnetic field. Our results show a downward curvature in magnetization of system with spin-dependent correlation for all densities and relevant temperatures. A metamagnetic behavior has been observed as a maximum in susceptibility versus magnetic field, when the spin–spin correlation has been considered. This maximum occurs at [Formula: see text] for all densities and temperatures. This behavior has not been observed in the case of spin-independent correlation function.

Unified Model for Gas-Liquid Pipe Flow Via Slug Dynamics: Part 2 — Model Validation

2002 ◽  
Author(s):  
Hong-Quan Zhang ◽  
Qian Wang ◽  
Cem Sarica ◽  
James P. Brill
Keyword(s):  
Experimental Data ◽  
Liquid Flow ◽  
Pipe Flow ◽  
Flow Behavior ◽  
Two Phase ◽  
Flow Rates ◽  
Inclination Angles ◽  
Gas Liquid Flow ◽  
Extensive Experimental Data ◽  
Good Agreement

In Zhang et al. [1], a unified hydrodynamic model is developed for prediction of gas-liquid pipe flow behavior based on slug dynamics. In this study, the new model is validated with extensive experimental data acquired with different pipe diameters, inclination angles, fluid physical properties, gas-liquid flow rates and flow patterns. Good agreement is observed in every aspect of the two-phase pipe flow.

Biodegradation of Nanoparticles in a Body from Mössbauer and Magnetization Measurements

2012 ◽  
Vol 190 ◽  
pp. 725-728 ◽  
Author(s):  
Mikhail Chuev ◽  
Valery Cherepanov ◽  
Maxim P. Nikitin ◽  
Mikhail Polikarpov
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Magnetic Nanoparticles ◽  
External Magnetic Field ◽  
Chemical Transformation ◽  
Living Organism ◽  
Quantitative Information ◽  
Spectral Shape ◽  
Magnetization Curves ◽  
Field Dependent

In order to extract a quantitative information about characteristics of the magnetic nanoparticles injected into a living organism one has to define a model of the magnetic dynamics in order to fit self-consistently the whole set of the experimental data, particularly, the evolution of Mössbauer spectral shape with temperature and external magnetic field as well as the magnetization curves. We have developed such a model and performed such an analysis of the temperature-and magnetic field-dependent spectra and magnetization curves of nanoparticles injected into a mice. This allowed us to reliably evaluate changes in the residual nanoparticles characteristics and their chemical transformation to paramagnetic ferritin-like forms in different mouses organs as a function of time after injection of nanoparticles. Actually, the approach allows one to quantitatively characterize biodegradation and biotransformation of magnetic nanoparticles injected into a body.

scholarly journals Bending and Position Hysteresis of Magnetic Microfibers in Nonuniform Magnetic Fields

2012 ◽  
Vol 7 (2_suppl) ◽  
pp. 155892501200702 ◽  
Author(s):  
Richard E. Groff ◽  
Meng Li ◽  
Harshwardhan Karve ◽  
Alexander Tokarev ◽  
Kostantin G. Kornev
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Magnetic Properties ◽  
Model Simulation ◽  
Ritz Method ◽  
Polymer Fibers ◽  
Qualitative Behavior ◽  
Nonuniform Field ◽  
Local Minima ◽  
Hysteresis Behavior

Magnetic microfibers are fibers that behave as a flexible paramagnetic body, for example, polymer fibers filled with superparamagnetic particles. A cantilevered magnetic microfiber will bend in response to an applied magnetic field. In a nonuniform field, generated for example by a single electromagnet or by a magnetic dipole, a magnetic microfiber displays position hysteresis as the field strength increases and decreases. This paper presents a model for determining stable shapes of a cantilevered magnetic microfiber in a nonuniform magnetic field. The model determines stable shapes by finding local minima of the potential energy using a Rayleigh-Ritz method. The model predicts the position hysteresis behavior observed in magnetic microfibers. Experimental data ware collected using two electromagnets with different geometries. The model simulation and experimental data compare well both qualitatively and quantitatively. The model will be useful for designing actuators based on magnetic microfibers and for characterizing the magnetic properties of fabricated fibers. A rigid bar model is also introduced, which captures the qualitative behavior of the fiber and illustrates the source of the position hysteresis behavior.

CALCULATIONS OF THE ZEEMAN SPLITTING FOR PLATINUM GROUP METALS AND NOBLE METALS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 271-274 ◽  
Author(s):  
ANDERS HJELM
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Electronic Structures ◽  
Noble Metals ◽  
Zeeman Splitting ◽  
Platinum Group Metals ◽  
Exchange Correlation ◽  
Orbital Magnetism ◽  
Platinum Group ◽  
Good Agreement

The electronic structures for Rh, Pd, Ir, Pt, Cu, Ag and Au are calculated including the effects of an external magnetic field, using the LMTO — ASA method. The field is included self consistently by adding the Zeeman term to the Hamiltonian in the variational step. The Zeeman splitting of cyclotron orbits on the Fermi surface as well as bulk susceptibilities are calculated for various exchange — correlation potentials. For the platinum group metals good agreement with experiments is found but for the noble metals effects creating orbital magnetism are exaggerated and the calculated susceptibilities as well as the cyclotron orbit Zeeman splitting are larger than the experimental data.

Phase Transitions between Magnetic Incommensurate States of Terbium Manganite in Magnetic Field

2014 ◽  
Vol 215 ◽  
pp. 71-76 ◽  
Author(s):  
Irina E. Chupis ◽  
Helen A. Kovtun
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Phase Transitions ◽  
Calculated Phase Diagram ◽  
Electric Polarization ◽  
Spin States ◽  
Magnetic Anisotropy Energy ◽  
Spin Cycloid ◽  
Modulation Vector ◽  
Good Agreement

Phase transitions between incommensurate spin states in ferroelectromagnet TbMnO3 in magnetic field along the modulation vector are phenomenologically analyzed. It is shown that the competition between different terms of the fourth order in magnetic anisotropy energy is a reason of the reorientation of spin-cycloid plane and electric polarization by 900 (polarization flop). Calculated phase diagram is in a good agreement with experimental data.

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