Publications by authors named "Dmitry V Roshchupkin"

2 Publications

  • Page 1 of 1

Influence of the Quantum Well Structure and Growth Temperature on a Five-Layer InGaMnAs Quantum Well with an InGaAs Buffer Layer.

J Nanosci Nanotechnol 2018 Jun;18(6):4355-4359

Institute of Microelectronics Technology and High-Purity Materials, Russian Academy of Sciences, Chernogolovka 142432, Russian Federation.

The influence of quantum well structure and growth temperature on a synthesized multilayer system composed of a five-layer InMnGaAs quantum well with an InGaAs buffer layer grown on semi-insulating (100)-oriented substrates prepared by low temperature molecular beam epitaxy was studied. The magnetization measurements using a superconducting quantum interference device indicated the existence of ferromagnetism with a Curie temperature above room temperature in the five-layer InGaMnAs quantum well structure with an InGaAs buffer layer in a GaAs matrix. X-ray diffraction and secondary ion mass spectroscopy measurements confirmed the second phase formation of ferromagnetic GaMn clusters. The ferromagnetism that exists in the five-layer of the InMnGaAs quantum well with the InGaAs buffer layer results from a superposition of the ferromagnetism of the low temperature region from the substitutional Mn ions into Ga sites or interstitial Mn ions as well as the presence of manganese ions dopant clusters such as GaMn clusters.
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http://dx.doi.org/10.1166/jnn.2018.15008DOI Listing
June 2018

X-ray topography analysis of acoustic wave fields in the SAW-resonator structures.

IEEE Trans Ultrason Ferroelectr Freq Control 2005 Nov;52(11):2081-7

Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, Laboratory of X-ray Acoustooptics, Chernogolovka, Russian Federation.

The formation of fields of standing surface acoustic waves (SAW) in LiNbO3 and La3Ga5SiO14 (LGS) crystals was studied by high-resolution topography method on a laboratory X-ray source. The fields of standing SAW were formed using SAW-resonator structures consisting of interdigital transducer (IDT) and reflecting gratings. The SAW amplitudes and power flow angles were measured by X-ray topography, diffraction in acoustic beam was visualized, and the SAW interaction with the crystal structure defects was studied.
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http://dx.doi.org/10.1109/tuffc.2005.1561678DOI Listing
November 2005