scholarly journals Моделирование взаимодействия зонда магнитно-резонансного силового микроскопа с ферромагнитным образцом

2019 ◽  
Vol 89 (11) ◽  
pp. 1646
Author(s):  
Р.В. Горев ◽  
Е.В. Скороходов ◽  
В.Л. Миронов
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Oscillation Amplitude ◽  
Forced Oscillations ◽  
Spatial Distributions ◽  
Force Interaction ◽  
Resonance Response ◽  
Magnetic Resonance Force Microscope ◽  
Probe Sensor ◽  
Good Agreement

We report the calculating algorithm and micromagnetic simulation of the resonance response of a magnetic resonance force microscope (MRFM) probe sensor. The simulation of the sample magnetization forced oscillations enables calculating the alternating component of the probe-sample force interaction and to draw the MRFM spectrum in the form of the dependence of cantilever oscillation amplitude on an external magnetic field. In addition, the simulation of the time dependences for all components of the magnetization allows the analysis of spatial distributions for spin-wave resonances in the samples. For the test object in the form of rectangular permalloy microstrips a good agreement between model and experimental MRFM spectra was observed.

Viscomagnetic Heat Flux Experiments as a Test of Gas Kinetic Theory in the Burnett Regime

1978 ◽  
Vol 33 (7) ◽  
pp. 749-760 ◽  
Author(s):  
G. E. J. Eggermont ◽  
P. W. Hermans ◽  
L. J. F. Hermans ◽  
H. F. P. Knaap ◽  
J. J. M. Beenakker
Keyword(s):  
Magnetic Field ◽  
Boundary Layer ◽  
Heat Flux ◽  
External Magnetic Field ◽  
Room Temperature ◽  
Flow Direction ◽  
Rectangular Channel ◽  
Gas Kinetic Theory ◽  
The Magnetic Field ◽  
Good Agreement

In a rarefied polyatomic gas streaming through a rectangular channel, an external magnetic field produces a heat flux perpendicular to the flow direction. Experiments on this “viscom agnetic heat flux” have been performed for CO, N2, CH4 and HD at room temperature, with different orientations of the magnetic field. Such measurements enable one to separate the boundary layer contribution from the purely bulk contribution by means of the theory recently developed by Vestner. Very good agreement is found between the experimentally determined bulk contribution and the theoretical Burnett value for CO, N2 and CH4 , yet the behavior of HD is found to be anomalous.

The mmW Band Tamm States in One-Dimensional Magnetophotonic Crystals

2009 ◽  
Vol 152-153 ◽  
pp. 394-396 ◽  
Author(s):  
Sergey I. Tarapov ◽  
M. Khodzitskiy ◽  
S.V. Chernovtsev ◽  
D. Belosorov ◽  
A.M. Merzlikin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Theoretical Prediction ◽  
Experimental Results ◽  
One Dimensional ◽  
Magnetophotonic Crystals ◽  
Good Agreement

The mmW band photonic Tamm states in 1D magnetophotonic crystals are studied. It is shown the possibility to manipulate the eigenfrequencies of such states by an external magnetic field. Our experimental results are in a good agreement with theoretical prediction.

The thickness of perpendicular collisionless shocks in a hot plasma

1972 ◽  
Vol 8 (2) ◽  
pp. 137-142 ◽  
Author(s):  
R. A. Cairns
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Wave Front ◽  
Characteristic Length ◽  
Magnetic Pressure ◽  
Collisionless Shocks ◽  
Hot Plasma ◽  
Shock Thickness ◽  
Good Agreement

By linearizing about the upstream state, the characteristic length for the growth of magnetic field in a laminar wave front, propagating perpendicular to an external magnetic field, is found as a function of βi, the ratio of ion pressure to magnetic pressure. For values of βi, between 10–2 and 1 the thickness is found to scale as . This scaling is in good agreement with the observed scaling of turbulent shocks, suggesting that for such shocks the shock thickness is closely related to that of the corresponding laminar pulse.

THE SIMULATION OF THE TWO-DIMENSIONAL ISING MODEL IN THE PRESENCE OF AN EXTERNAL MAGNETIC FIELD ON THE CREUTZ CELLULAR AUTOMATON

2000 ◽  
Vol 11 (03) ◽  
pp. 561-572 ◽  
Author(s):  
B. KUTLU ◽  
M. KASAP ◽  
S. TURAN
Keyword(s):  
Magnetic Field ◽  
Ising Model ◽  
External Magnetic Field ◽  
Cellular Automaton ◽  
Critical Behavior ◽  
Finite Size ◽  
Two Dimensional ◽  
Finite Size Scaling ◽  
Creutz Cellular Automaton ◽  
Good Agreement

The two-dimensional Ising model in a small external magnetic field, is simulated on the Creutz cellular automaton. The values of the static critical exponents for 0.0025 ≤ h ≤ 0.025 are estimated within the framework of the finite size scaling theory. The value of the field critical exponent is in a good agreement with its theoretical value of δ = 15. The results for 0.0025 ≤ h ≤ 0.025 are compatible with Ising critical behavior for T < Tc.

EFFECT OF EXTERNAL MAGNETIC FIELD ON AFM ORDER PARAMETER AND NEEL TEMPERATURE IN ELECTRON DOPED CUPRATE SUPERCONDUCTORS

2009 ◽  
Vol 23 (26) ◽  
pp. 3125-3135 ◽  
Author(s):  
B. N. PANDA ◽  
B. K. SAHOO
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Order Parameter ◽  
Cuprate Superconductors ◽  
Antiferromagnetic Order ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Double Time ◽  
Experimental Findings ◽  
Good Agreement

A theoretical model is presented to study the effect of an external magnetic field on antiferromagnetic (AFM) order parameter and Neel temperature in electron doped high TC cuprates in normal state. The expression for the antiferromagnetic order parameter is derived by using double time electron Green function of Zubarev type and studied numerically. It is found that the magnetic field up to a certain parametric value considerably enhances the Neel temperature. Above this value, the Neel temperature decreases on increasing the field. The trend of field dependence of the AFM order parameter at 30 K is quite similar to that of Neel temperature. This parametric study of external magnetic field is in good agreement with experimental findings.

Isothermal Dehydriding Kinetics of Mg2NiH4 Prepared under an External Magnetic Field

2013 ◽  
Vol 785-786 ◽  
pp. 638-641
Author(s):  
Jing Liu
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Solid Solution ◽  
External Magnetic Field ◽  
Magnetic Intensity ◽  
Hydrogen Atoms ◽  
Kinetics Of ◽  
Rate Controlling Step ◽  
Diffusion Of Hydrogen ◽  
Good Agreement

The Mg2NiH4hydrogen storage metal hydride was prepared by hydriding combustion synthesis under an external magnetic field. The dehydriding kinetics of the hydrides was measured under isotherm condition. The kinetics mechanism of Mg2NiH4materials was analyzed by model. The calculated results show that the theoretical calculation and the experimental data can reach a good agreement. The rate-controlling step is the diffusion of hydrogen atoms in the solid solution. The dehydriding activation energies of the sample synthesized under the optimized magnetic intensity of 6 T is 104 kJ/mol H2.

scholarly journals Spectroscopic fingerprint of chiral Majorana modes at the edge of a quantum anomalous Hall insulator/superconductor heterostructure

2019 ◽  
Vol 117 (1) ◽  
pp. 238-242 ◽  
Author(s):  
Junying Shen ◽  
Jian Lyu ◽  
Jason Z. Gao ◽  
Ying-Ming Xie ◽  
Chui-Zhen Chen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Andreev Reflection ◽  
Quantum Hall ◽  
Edge States ◽  
Superconducting Phases ◽  
Chern Numbers ◽  
Theoretical Predictions ◽  
Majorana Modes ◽  
Good Agreement

With the recent discovery of the quantum anomalous Hall insulator (QAHI), which exhibits the conductive quantum Hall edge states without external magnetic field, it becomes possible to create a topological superconductor (SC) by introducing superconductivity into these edge states. In this case, 2 distinct topological superconducting phases with 1 or 2 chiral Majorana edge modes were theoretically predicted, characterized by Chern numbers (N) of 1 and 2, respectively. We present spectroscopic evidence from Andreev reflection experiments for the presence of chiral Majorana modes in an Nb/(Cr0.12Bi0.26Sb0.62)2Te3heterostructure with distinct signatures attributed to 2 different topological superconducting phases. The results are in qualitatively good agreement with the theoretical predictions.

scholarly journals Instability caused swimming of ferromagnetic filaments in pulsed field

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abdelqader Zaben ◽  
Guntars Kitenbergs ◽  
Andrejs Cēbers
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Numerical Simulations ◽  
Wave Field ◽  
Duty Cycle ◽  
Pulse Wave ◽  
Medical Applications ◽  
Field Profile ◽  
Pulsed Field ◽  
Good Agreement

AbstractMagnetic filaments driven by external magnetic field are an interesting topic of research in-terms of the possible bio-medical applications. In this paper, we investigated the applicability of using ferromagnetic filaments as micro swimmers both experimentally and numerically. It was found that applying a pulse wave field profile with a duty cycle of 30$$\%$$ % induced experimentally observable swimming, which is similar to the breast stroke of micro algae. Good agreement with numerical simulations was found. Moreover, for stable continuous swimming, an initial filament shape is required to avoid transition to the structurally preferred non-swimming S-like mode.

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