I. V. Malikov
Russian Academy of Sciences
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Publication
Featured researches published by I. V. Malikov.
Journal of Communications Technology and Electronics | 2013
S. G. Chigarev; I. V. Malikov; G. M. Mikhailov
A method for the measurement and identification of the radiation frequencies of the spin-injection oscillator in the terahertz frequency range using a diffraction grating is developed and experimentally implemented. For the system consisting of a ferromagnetic rod (Fe) and nanosized ferromagnetic film (Fe3O4 with a thickness of up to 100 nm), the thermal and dynamic components of the radiation that is induced by the current flow are separated. The diffraction peaks at a frequency of about 9.6 THz and a band of 37% at a level of 3 dB and at a frequency of 43.5 THz are demonstrated. It is shown that the intensity of each signal is significantly higher than the thermal background level.
Journal of Communications Technology and Electronics | 2011
Yu. V. Gulyaev; S. G. Chigarev; I. V. Malikov; G. M. Mikhailov; P. E. Zil’berman; E. M. Epshtein
The energy efficiency of the spin-injection emitter based on the rod-film ferromagnetic structure with a point contact between the components in the terahertz frequency range is experimentally estimated. The film material substantially affects the efficiency. A concentrator of magnetic flux is proposed for an increase in the efficiency. The experimental estimations allow the quantum yield of the emitter that is greater than unity. This result indicates significant contribution of the stimulated radiative transitions.
International Journal of Nanoscience | 2004
I. V. Malikov; L.A. Fomin; V. Yu. Vinnichenko; G. M. Mikhailov
Magnetoresistance of a planar single crystalline Ni nanostructures has been measured at room and liquid helium temperatures. Bending GMR effect increases from 4% under diffusive to more than 200% under ballistic electron transport in cross-type nanostructures. Magnetoresistance measured for longitudinal and transverse magnetic fields are qualitatively different and explained by a nonsymmetrical magnetic domain structure in the central part of the cross.
Journal of Communications Technology and Electronics | 2015
E. A. Vilkov; Yu. V. Gulyaev; P. E. Zil’berman; I. V. Malikov; G. M. Mikhailov; A. I. Panas; A. V. Chernykh; S. G. Chigarev
The possibility of generation of terahertz electromagnetic waves by the current in a planar structure composed of metalferromagnetic nanoparticles imbedded into an antiferromagnetic medium, is considered.
Solid State Phenomena | 2010
G. M. Mikhailov; L.A. Fomin; V.Yu. Vinnichenko; I. V. Malikov; A.V. Chernikh
Complementary analysis of morphology, crystal structure, electronic transport, and magnetic properties is applied to optimize the epitaxial growth of Fe(001) films with the improved electronic transport and magnetic properties. It was found that the mean free path of residual electrons and coercive forces are correlated in the epitaxial single-crystal Fe(001) films grown under different temperatures and depend on the film morphology.
Russian Microelectronics | 2018
I. V. Malikov; V. A. Berezin; L.A. Fomin; G. M. Mikhailov
The current–voltage (I–U) characteristics of a cross-shaped metal-dielectric-metal (MDM) Ni/NiO/Fe structures with NiO layers of different thicknesses are investigated. The dependence of the sign of the differential resistance on the current flowing through the structure and on the thickness of the NiO in a four-contact measuring system of potentials is revealed. In a region 8–10 nm thick, the voltage on the structure changes sign thrice and has the form of an N-shaped curve. This dependence is explained by the geometric effect, which appears due to the competition between the vertical and lateral electron transport, when the ratio of the resistances of the dielectric interlayer and metallic leading electrodes changes under the influence of the current. The numerical calculation confirms the experimentally observed I–U dependences.
Journal of Communications Technology and Electronics | 2014
S. G. Chigarev; I. V. Malikov; A. V. Chernykh; G. M. Mikhailov
A spin-injection oscillator in the pulsed regime is studied for the first time at different time parameters of current pulses using an opto-acoustic transducer in the absence of chopper. The reciprocity principle is violated when the direction of current in the pulse is reversed in the pulsed regime of the terahertz generation. The radiation signal of the spin-injection emitter is proportional to the number of charges that are injected by a current pulse and does not depend on the energy that is released in the presence of the pulsed current flow.
Journal of Communications Technology and Electronics | 2010
S. G. Chigarev; L.A. Fomin; I. V. Malikov; G. M. Mikhailov; P. E. Zil’berman; E. M. Epshtein
The dependence of the anisotropic magnetoresistance (AMS) of the single-crystal Fe(001) film grown with the aid of the pulsed laser evaporation on the direction and magnitude of the external magnetic field is analyzed. Three ranges of magnetic fields with different types of variation in AMS with the direction of magnetic field are revealed. The discontinuities of resistance and the hysteresis are demonstrated in a certain range of magnetic fields. The anisotropy field is estimated using the experimental results.
Proceedings of SPIE, the International Society for Optical Engineering | 2008
I. V. Malikov; L.A. Fomin; Valery Yu. Vinnichenko; G. M. Mikhailov
Iron film growth conditions and films properties on A- and R- sapphire surfaces were investigated. The best growth conditions were achieved at temperatures about 250 - 300°C. A 10 nm Mo seed layer on the A-sapphire surface improves Fe film morphology and film roughness becomes less than 1 nm. As a result epitaxial Fe (011) films with high residual electron mean free paths (about 0.5 mkm) were grown on the A-sapphire surface. These films can be used for ballistic ferromagnetic planar nanostructures fabrication. The magnetic domain configuration of epitaxial iron nanostructures shaped as bridges and crosses depending on the orientation relative to the easy magnetic axis Fe [100] was examined. If the long side of the bridge is directed along the easy magnetic axis, the single domain structure state is easily reached up to maximum structure width about 2 mkm. A stripe domain structure can be observed when the easy magnetic axis is normal to the long rectangular structure axis. The structure orientation at some angle with the easy magnetic axis leads to a magnetic domain configuration along the easy axis is independent of the structure size down to a structure width ~0.5 mkm and depends only on the easy axis direction. The single domain state can be obtained in structures with a width less than 0.5 mkm. The cross-type structures may have only a two-fold symmetry magnetic configuration. Trapeziform domains were found in structures directed along the hard Fe magnetic axis.
Bulletin of The Russian Academy of Sciences: Physics | 2014
P. E. Zilberman; I. V. Malikov; G. M. Mikhailov; S. G. Chigarev; E. M. Epstein
The generation of electromagnetic THz waves by a current is experimentally investigated in planar structures comprised of two ferromagnetic films. When the films come into contact with a thin copper rod, the current is applied to both layers. The first layer, which plays the role of an injector, polarizes the spins of the current carriers. In the second working layer, the conditions are created for spin population inversion and the generation of THz waves. At a current of 350 mA, the radiation wavelength is 16.4 THz and a power of 10 mW is reached at room temperature.