scholarly journals Quantum paradigm of the foldover magnetic resonance

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yu. M. Bunkov ◽  
A. N. Kuzmichev ◽  
T. R. Safin ◽  
P. M. Vetoshko ◽  
V. I. Belotelov ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Josephson Effect ◽  
Magnetic System ◽  
Bose Condensate ◽  
Magnetic Sensors ◽  
Quantum Phenomenon ◽  
Quantum Behavior ◽  
Magnetization Precession ◽  
Quantum Phenomena ◽  
Iron Garnet

AbstractThe explosive development of quantum magnonics requires the consideration of several previously known effects from a new angle. In particular, taking into account the quantum behavior of magnons is essential at high excitations of the magnetic system, under the conditions of the so-called phenomenon of “foldover” (bi-stable) magnetic resonance. Previously, this effect was considered in the quasi-classical macrospin approximation. However, at large angles of magnetization precession, the magnon density exceeds the critical value for the formation of a magnon Bose condensate (mBEC). Naturally, this purely quantum phenomenon does not exist in the classical approximation. In addition, mBEC leads to superfluid transfer of magnetization, which suppresses the macroinhomogeneity of the samples. The experiments presented in the article show that quantum phenomena well describes the experimental results of nonlinear magnetic resonance in yttrium iron garnet. Thus, we remove the questions that arose earlier when considering this effect without taking into account quantum phenomena. This discovery paves the way for many quantum applications of supermagnonics, such as the magnetic Josephson effect, long-range spin transport, Q-bits, quantum logic, magnetic sensors, and others.

scholarly journals Quantum Paradigm of the Foldover Magnetic Resonance

2020 ◽  
Author(s):  
Y. Bunkov ◽  
A. Kuzmichev ◽  
T. Safin ◽  
P. Vetoshko ◽  
V. Belotelov ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Josephson Effect ◽  
Bose Condensate ◽  
Point Of View ◽  
Magnetic Sensors ◽  
Long Distance ◽  
Quantum Logics ◽  
Strong Excitation ◽  
Spatial Redistribution ◽  
Iron Garnet

Abstract The explosive development of quantum magnonics requires considering several previously known effects from a new angle. In this article, we revise the phenomenon of "foldover" (bi-stable) magnetic resonance from the point of view of quantum magnonics. The density of magnons under strong excitation can exceed the critical value for the formation of a magnon Bose condensate. Under these conditions, the effect of quantum transport of magnons should be considered. In particular, the effect of spin superfluidity, discovered earlier in super fluid 3He should lead to spatial redistribution of the precessing magnetization. Our experimental results confirm a significant change in properties of the foldover magnetic resonance in yttrium iron garnet (YIG) due to superfluid magnetization transport. This discovery paves the way for many quantum applications of supermagnonics, such as magnetic Josephson effect, long-distance spin transport, Q-bit, quantum logics, magnetic sensors, and others.

scholarly journals The development of the magnetic system of sensor for PMR-analyser

2020 ◽  
Vol 22 (4) ◽  
pp. 115-122
Author(s):  
A. Y. Svinin ◽  
R. S. Каshaev ◽  
O. V. Коzelkov
Keyword(s):  
Magnetic Field ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic System ◽  
Scientific Paper ◽  
Magnetic Sensors ◽  
Measuring Instruments ◽  
Main Task ◽  
Magnetic Field Homogeneity ◽  
Nuclear Magnetic

The enhancement of the measuring instruments accuracy has always been the most crucial task for engineers and scientists. In particular, in the field of nuclear magnetic resonance, the creation of uniform magnetic field often defines the results of measurements, therefore the main task of this study is to develop Halbach magnet array based on design characteristics of developing NMR-analyzer. The research describes the development process of the main sensor’s magnetic system components for continuous-flow portable NMR-analyzer. The scientific paper makes a different variations analysis of Halbach magnet arrays on the degree of the magnetic field homogeneity, shows the process of development and production of the 3D-framework for Halbach magnet array for NMR-analyzer. The article also gives information on the design of quartz generator based on Pierce oscillator circuit for receiver-transmitter coil of the NMR-analyzer’s sensor. The results could be useful for the magnetic sensors design with high degree of homogeneity, measuring instruments and devices using the method of nuclear magnetic resonance in its foundation.

scholarly journals Quantum magnetic monopole condensate

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
M. C. Diamantini ◽  
C. A. Trugenberger ◽  
V. M. Vinokur
Keyword(s):  
Bose Condensate ◽  
Meissner Effect ◽  
Magnetic Monopoles ◽  
Classical Electrodynamics ◽  
Cooper Pairs ◽  
Quantum Behavior ◽  
Magnetic Symmetry ◽  
Electric Analog ◽  
Classical Particles ◽  
Full Quantum

AbstractDespite decades-long efforts, magnetic monopoles were never found as elementary particles. Monopoles and associated currents were directly measured in experiments and identified as topological quasiparticle excitations in emergent condensed matter systems. These monopoles and the related electric-magnetic symmetry were restricted to classical electrodynamics, with monopoles behaving as classical particles. Here we show that the electric-magnetic symmetry is most fundamental and extends to full quantum behavior. We demonstrate that at low temperatures magnetic monopoles can form a quantum Bose condensate dual to the charge Cooper pair condensate in superconductors. The monopole Bose condensate manifests as a superinsulating state with infinite resistance, dual to superconductivity. The monopole supercurrents result in the electric analog of the Meissner effect and lead to linear confinement of the Cooper pairs by Polyakov electric strings in analogy to quarks in hadrons.

scholarly journals Magnetic resonance study of co-modified (Co,N)-TiO2 nanocomposites

Nukleonika ◽  
2015 ◽  
Vol 60 (3) ◽  
pp. 411-416 ◽  
Author(s):  
Niko Guskos ◽  
Grzegorz Zolnierkiewicz ◽  
Aleksander Guskos ◽  
Janusz Typek ◽  
Pawel Berczynski ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Spin System ◽  
Concentration Index ◽  
Room Temperature ◽  
Magnetic System ◽  
Resonance Spectroscopy ◽  
Relaxation Processes ◽  
Strongly Correlated ◽  
Magnetic Resonance Study ◽  
Cobalt Ions

Abstract Three nCo,N-TiO2 nanocomposites (where cobalt concentration index n = 1, 5 and 10 wt %) were prepared and investigated by magnetic resonance spectroscopy at room temperature. Ferromagnetic resonance (FMR) lines of magnetic cobalt agglomerated nanoparticle were dominant in all registered spectra. The relaxation processes and magnetic anisotropy of the investigated spin system essentially depended on the concentration of cobalt ions. It is suggested that the samples contained two magnetic types of sublattices forming a strongly correlated spin system. It is suggested that the existence of strongly correlated magnetic system has an essential influence of the photocatalytic properties of the studied nanocomposites.

TUNNELING IN A QUANTUM HALL EXCITONIC CONDENSATE

2002 ◽  
Vol 16 (20n22) ◽  
pp. 2923-2923 ◽  
Author(s):  
J. P. EISENSTEIN ◽  
I. B. SPIELMAN ◽  
L. N. PFEIFFER ◽  
K. W. WEST
Keyword(s):  
Ground State ◽  
Josephson Effect ◽  
Bose Condensate ◽  
Quantum Hall ◽  
Collective Modes ◽  
Tunneling Conductance ◽  
Electron Gases ◽  
Linear Dispersion ◽  
Zero Bias ◽  
Long Wavelength

Recent experiments on the tunneling conductance between parallel 2D electron gases at total Landau level filing ν tot = 1 are described. When the two layers are close enough together the ground state of the system may be viewed as a Bose condensate of excitons consisting of electrons in one layer paired with (conduction band) holes in the other. The measured tunneling conductance exhibits a spectacular resonance around zero bias which resembles the dc Josephson effect. This resonance is a signature of long wavelength Goldstone collective modes in the phase coherent ground state. Experiments performed with an added in-plane magnetic field have demonstrated the expected linear dispersion of this mode.

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