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Your search keyword '"Constantinian Karen Y."' showing total 14 results
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14 results on '"Constantinian Karen Y."'

1. Generation and detection of spin current in iridate/manganite heterostructures

Author

Ulev, Georgii D., Ovsyannikov, Gennady A., Constantinian, Karen Y., Shadrin, Anton V., Moskal, Ivan E., and Lega, Peter V.

Subjects
Physics - Applied Physics, Physics - Instrumentation and Detectors
Abstract

The present study focuses on experimental investigations of spin current across the interface of an iridate/manganite heterostructure (SrIrO3/La0.7Sr0.3MnO3) consisting of oxide epitaxial films with nanometer thickness. Pure spin current is induced by microwave irradiation in the GHz frequency band, specifically under conditions of ferromagnetic resonance. The detection of spin current is achieved through the inverse spin-Hall effect, which measures the charge current arising on the electrically conductive SrIrO3 film with strong spin-orbit interaction. To quantify the efficiency of spin current conversion to charge current, the angular dependences of spin magnetoresistance of the iridate/manganite interface are measured, thereby determining the spin- Hall angle., Comment: 13 pages, 7 figures

Published
2023

2. Magnetic interaction at the interface of epitaxial manganite film and (TbCo2/FeCo)n superlattice

Author

Grishin Alexander S., Ovsyannikov Gennady A., Klimov Alexey A., Demidov Viktor V., Constantinian Karen Y., Borisenko Igor V., Preobrazhensky Vladimir L., Tiercelin Nicolas, and Pernod Phillipe

Subjects
Physics, QC1-999
Abstract

Hybrid magnetic heterostructures made of epitaxial manganite La0.7Sr0.3MnO3 thin film and intermetallic superlattice (TeCo2/FeCo)n were prepared on orthorhombic NdGaO3 substrates and characterized by means of magneto-optical Kerr effect and magnetoresistance. Experimental data show that magnetic interaction between La0.7Sr0.3MnO3 and (TeCo2 /FeCo)n is of the antiferromagnetic type. The features observed in magnetotransport characteristics are caused by the magnetization reversal at the interface between manganite thin film and intermetallic superlattice.

Published
2018
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3. Bandwidth and noise of submillimeter wave cuprate bicrystal Josephson junction detectors

Author

Ovsyannikov, Gennady A., Borisenko, Igor V., Constantinian, Karen Y., Uzunoglu, Nikolao, Karagianni, Evangelia, Kislinski, Yulii V., Pedersen, Niels F., Mygind, Jesper, Hakhoumian, Arsen A., Pogosyan, Nubar G., and Zakaryan, Tigran

Subjects
Millimeter wave devices -- Design and construction, Yttrium barium copper oxides -- Electric properties, Josephson junction -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

Detectors made from superconducting cuprate YBa2Cu3Ox bicrystal Josephson junctions (BJJs) on sapphire and NdGaO3 substrates is fabricated and characterized in the frequency band 200-900 GHz. BJJs on sapphire substrates had high R(sub N) values suitable for RF matching, but exhibit large I(sub C)R(sub N) greater than 1 mV at temperature less than 20 K.

Published
2005

4. Shot noise in YBCO bicrystal Josephson junctions

Author

Constantinian, Karen Y., Ovsyannikov, Gennady A., Borisenko, Igor V., Mygind, Jesper, and Pedersen, Niels F.

Subjects
Superconductive devices -- Research, Josephson junction -- Research, Superconductors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Current transport and noise emission processes in YBCO bicrystal Josephson junctions are investigated and reported.

Published
2003

6. Arrays of Josephson junctions coupled by distributed circuits

Author

Kornev, Victor K., Shcherbakov, Nikita A., Arzumanov, Alexey V., Mozhaev, Peter B., Mashtakov, Alexandre D., Constantinian, Karen Y., and Ovsyannikov, Gennady A.

Subjects
Josephson junction -- Research, Microwave oscillators -- Research, Superconductivity -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Research describing the characteristics of Josephson junction arrays with distributed coupling circuits is presented. In particular the gain in output power and the linewidth reduction are investigated.

Published
2001

7. High frequency detector response from an array of HTSC bicrystal Josephson junctions

Author

Constantinian, Karen Y., Mashtakov, Alexander D., Ovsyannikov, Gennady A., Lee, Kiejin, and Iguchi, Ienari

Subjects
High temperature superconductors -- Usage, Josephson effect -- Usage, Josephson junction -- Research, Magnetic fields -- Usage, Submillimeter waves -- Research, Yttrium barium copper oxides -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

A study of high temperature superconducting YbaCuO Josephson junction arrays that were fabricated on magnesium oxide bicrystal substrates is reported. The study was conducted at wide frequency ranges of 7 to 26 GHs, 45 to 120 GHz and at submillimeter 470 to 510 GHz waves. The application of a direct current magnetic field resulted in the observance of mm and submm wave harmonic and subharmonic selective detector response signals.

Published
1999

8. On and off-chip detection of radiation from HTS Josephson junction arrays

Author

Lee, Kiejin, Iguchi, Ienari, and Constantinian, Karen Y.

Subjects
Electromagnetic radiation -- Research, High temperature superconductors -- Research, Josephson junction -- Research, Phase-locked loops -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Research was conducted to examine the mutual phase interaction between a single detector junction and a phase-locked three-junction array of high-critical-temperature Josephson junctions. In the array structure, the radiation power of Josephson junction array was measured using off-chip geometry coupled to radiometer and on-chip geometries coupled to the detector junction. The evidence of a strong phase-locking was demonstrated as well as the qualitative agreement with the theoretical available power by considering the mismatch and losses.

Published
1999

12. Magnetic interaction at the interface of epitaxial manganite film and (TbCo2/FeCo)n superlattice.

Author

Grishin, Alexander S., Ovsyannikov, Gennady A., Klimov, Alexey A., Demidov, Viktor V., Constantinian, Karen Y., Borisenko, Igor V., Preobrazhensky, Vladimir L., Tiercelin, Nicolas, and Pernod, Phillipe

Subjects
MAGNETIC properties of metallic films, EPITAXY, MANGANITE, TERBIUM, SUPERLATTICES
Abstract

Hybrid magnetic heterostructures made of epitaxial manganite La0.7Sr0.3MnO3 thin film and intermetallic superlattice (TeCo2/FeCo)n were prepared on orthorhombic NdGaO3 substrates and characterized by means of magneto-optical Kerr effect and magnetoresistance. Experimental data show that magnetic interaction between La0.7Sr0.3MnO3 and (TeCo2/FeCo)n is of the antiferromagnetic type. The features observed in magnetotransport characteristics are caused by the magnetization reversal at the interface between manganite thin film and intermetallic superlattice. [ABSTRACT FROM AUTHOR]

Published
2018
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