The Experts below are selected from a list of 15147 Experts worldwide ranked by ideXlab platform
Alexandre Buzdin - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic proximity effect in planar superconductor-ferromagnet structures
Applied Physics Letters, 2018Co-Authors: Sergey Mironov, A Mel'nikov, Alexandre BuzdinAbstract:The spread of the Cooper pairs into the ferromagnet in proximity coupled superconductor-ferromagnet (SF) structures is shown to cause a strong inverse Electromagnetic Phenomenon, namely, the long-range transfer of the magnetic field from the ferromagnet to the superconductor. Contrary to the previously investigated inverse proximity effect resulting from the spin polarization of superconducting surface layer, the characteristic length of the above inverse electrodynamic effect is of the order of the London penetration depth, which usually much larger than the superconducting coherence length. The corresponding spontaneous currents appear even in the absence of the stray field of the ferromagnet and are generated by the vector-potential of magnetization near the S/F interface and they should be taken into account at the design of the nanoscale S/F devices. Similarly to the well-known Aharonov-Bohm effect, the discussed Phenomenon can be viewed as a manifestation of the role of vector potential in quantum physics.
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Electromagnetic proximity effect in planar superconductor ferromagnet structures
Applied Physics Letters, 2018Co-Authors: Sergey Mironov, Alexandre Buzdin, A S MelnikovAbstract:The spread of Cooper pairs in a ferromagnet in proximity coupled superconductor-ferromagnet structures is shown to cause a strong inverse Electromagnetic Phenomenon, namely, the long-range transfer of the magnetic field from the ferromagnet to the superconductor. Contrary to the previously investigated inverse proximity effect resulting from the spin polarization of a superconducting surface layer, the characteristic length of the above inverse electrodynamic effect is of the order of the London penetration depth, which usually is much larger than the superconducting coherence length. The corresponding spontaneous currents appear even in the absence of the stray field of the ferromagnet and are generated by the vector-potential of magnetization near the S/F interface, and they should be taken into account in the design of nanoscale S/F devices. Similarly to the well-known Aharonov-Bohm effect, the discussed Phenomenon can be viewed as a manifestation of the role of vector potential in quantum physics.
Sergey Mironov - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic proximity effect in planar superconductor-ferromagnet structures
Applied Physics Letters, 2018Co-Authors: Sergey Mironov, A Mel'nikov, Alexandre BuzdinAbstract:The spread of the Cooper pairs into the ferromagnet in proximity coupled superconductor-ferromagnet (SF) structures is shown to cause a strong inverse Electromagnetic Phenomenon, namely, the long-range transfer of the magnetic field from the ferromagnet to the superconductor. Contrary to the previously investigated inverse proximity effect resulting from the spin polarization of superconducting surface layer, the characteristic length of the above inverse electrodynamic effect is of the order of the London penetration depth, which usually much larger than the superconducting coherence length. The corresponding spontaneous currents appear even in the absence of the stray field of the ferromagnet and are generated by the vector-potential of magnetization near the S/F interface and they should be taken into account at the design of the nanoscale S/F devices. Similarly to the well-known Aharonov-Bohm effect, the discussed Phenomenon can be viewed as a manifestation of the role of vector potential in quantum physics.
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Electromagnetic proximity effect in planar superconductor ferromagnet structures
Applied Physics Letters, 2018Co-Authors: Sergey Mironov, Alexandre Buzdin, A S MelnikovAbstract:The spread of Cooper pairs in a ferromagnet in proximity coupled superconductor-ferromagnet structures is shown to cause a strong inverse Electromagnetic Phenomenon, namely, the long-range transfer of the magnetic field from the ferromagnet to the superconductor. Contrary to the previously investigated inverse proximity effect resulting from the spin polarization of a superconducting surface layer, the characteristic length of the above inverse electrodynamic effect is of the order of the London penetration depth, which usually is much larger than the superconducting coherence length. The corresponding spontaneous currents appear even in the absence of the stray field of the ferromagnet and are generated by the vector-potential of magnetization near the S/F interface, and they should be taken into account in the design of nanoscale S/F devices. Similarly to the well-known Aharonov-Bohm effect, the discussed Phenomenon can be viewed as a manifestation of the role of vector potential in quantum physics.
Franco Nori - One of the best experts on this subject based on the ideXlab platform.
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Self-induced terahertz-wave transmissivity of waveguides with finite-length layered superconductors
Physical Review B, 2013Co-Authors: T. N. Rokhmanova, S. S. Apostolov, Z. A. Maizelis, V. A. Yampol’skii, Franco NoriAbstract:We predict and study theoretically a new nonlinear Electromagnetic Phenomenon in a sample of layered superconductor of finite length placed in a waveguide with ideal walls. Two geometries are considered here: when the superconducting layers are parallel or perpendicular to the waveguide axis. We show that the transmittance of the superconductor slab can vary over a wide range, from nearly zero to one, when changing the amplitude of the incident wave. Thus, one can induce the total transmission or reflection of the incident wave by just changing its amplitude. Moreover, the dependence of the superconductor transmittance on the incident wave amplitude has a hysteretic behavior with jumps. The considered Phenomenon of self-induced transparency can be observed even at small amplitudes, if the wave frequency $\omega$ is close to the cutoff frequency for linear Josephson plasma waves.
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Self-induced tunable transparency in layered superconductors
Physical Review B, 2010Co-Authors: S. S. Apostolov, Z. A. Maizelis, Mariia Sorokina, V. A. Yampol’skii, Franco NoriAbstract:We predict a distinct nonlinear Electromagnetic Phenomenon in layered superconducting slabs irradiated from one side by an Electromagnetic plane wave. We show that the reflectance and transmittance of the slab can vary over a wide range, from nearly 0 to 1, when changing the incident wave amplitude. Thus changing the amplitude of the incident wave can induce either the total transmission or reflection of the incident wave. In addition, the dependence of the superconductor transmittance on the incident wave amplitude has an unusual hysteretic behavior with jumps. This remarkable nonlinear effect (self-induced transparency) can be observed even at small amplitudes, when the wave frequency $\ensuremath{\omega}$ is close to the Josephson plasma frequency ${\ensuremath{\omega}}_{J}$.
Vikass Monebhurrun - One of the best experts on this subject based on the ideXlab platform.
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Influence of the hand on the specific absorption rate assessments of mobile phones
Microwave and Optical Technology Letters, 2012Co-Authors: Vikass MonebhurrunAbstract:The influence of the hand on the specific absorption rate (SAR) assessments of mobile phones is investigated.An increase of the SAR value in the presence of the hand has been observed but the Electromagnetic Phenomenon is still unexplained. The distance between the palm of the hand and the antenna is herein shown to be an important parameter. Numerical simulations and measurements performed using a dipole antenna placed in-between a flat head phantom and a flat hand phantom confirm that an increase of the SAR is expected for some specific values of the distance between the antenna and the hand at a given frequency
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Influence of the hand on the specific absorption rate assessments of mobile phones
Microwave and Optical Technology Letters, 2012Co-Authors: Vikass MonebhurrunAbstract:The influence of the hand on the specific absorption rate (SAR) assessments of mobile phones is investigated.An increase of the SAR value in the presence of the hand has been observed but the Electromagnetic Phenomenon is still unexplained. The distance between the palm of the hand and the antenna is herein shown to be an important parameter. Numerical simulations and measurements performed using a dipole antenna placed in-between a flat head phantom and a flat hand phantom confirm that an increase of the SAR is expected for some specific values of the distance between the antenna and the hand at a given frequency. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:654–656, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26644
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Study of the influence of the hand on the Specific Absorption Rate evaluation of mobile phones
2011 XXXth URSI General Assembly and Scientific Symposium, 2011Co-Authors: Vikass Monebhurrun, Man-fai Wong, Azeddine Gati, Joe WiartAbstract:The influence of the hand on the SAR (Specific Absorption Rate) assessments of mobile phones is investigated. A possible increase of the SAR value in the presence of the hand has been reported by several authors but the Electromagnetic Phenomenon is still unexplained. Numerical simulations are herein performed using four different mobile phones using the SAM (Specific Anthropomorphic Mannequin) phantom and a hand model at three different frequencies in order to understand the key parameters — mobile phone design, antenna type, frequency, etc. — which may influence the SAR value in the presence of the hand. An increase of the SAR is observed for one mobile phone model at 1950 MHz and for a configuration such that the distance between the antenna and the palm of the hand is about 20 mm. Additional numerical simulations and measurements performed using a dipole antenna placed in-between a flat head phantom and a flat hand phantom confirm that an increase of the SAR is obtained for some specific values of the distance between the antenna and the hand at a given frequency.
S. S. Apostolov - One of the best experts on this subject based on the ideXlab platform.
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Self-induced terahertz-wave transmissivity of waveguides with finite-length layered superconductors
Physical Review B, 2013Co-Authors: T. N. Rokhmanova, S. S. Apostolov, Z. A. Maizelis, V. A. Yampol’skii, Franco NoriAbstract:We predict and study theoretically a new nonlinear Electromagnetic Phenomenon in a sample of layered superconductor of finite length placed in a waveguide with ideal walls. Two geometries are considered here: when the superconducting layers are parallel or perpendicular to the waveguide axis. We show that the transmittance of the superconductor slab can vary over a wide range, from nearly zero to one, when changing the amplitude of the incident wave. Thus, one can induce the total transmission or reflection of the incident wave by just changing its amplitude. Moreover, the dependence of the superconductor transmittance on the incident wave amplitude has a hysteretic behavior with jumps. The considered Phenomenon of self-induced transparency can be observed even at small amplitudes, if the wave frequency $\omega$ is close to the cutoff frequency for linear Josephson plasma waves.
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Self-induced tunable transparency in layered superconductors
Physical Review B, 2010Co-Authors: S. S. Apostolov, Z. A. Maizelis, Mariia Sorokina, V. A. Yampol’skii, Franco NoriAbstract:We predict a distinct nonlinear Electromagnetic Phenomenon in layered superconducting slabs irradiated from one side by an Electromagnetic plane wave. We show that the reflectance and transmittance of the slab can vary over a wide range, from nearly 0 to 1, when changing the incident wave amplitude. Thus changing the amplitude of the incident wave can induce either the total transmission or reflection of the incident wave. In addition, the dependence of the superconductor transmittance on the incident wave amplitude has an unusual hysteretic behavior with jumps. This remarkable nonlinear effect (self-induced transparency) can be observed even at small amplitudes, when the wave frequency $\ensuremath{\omega}$ is close to the Josephson plasma frequency ${\ensuremath{\omega}}_{J}$.