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Aver'yanov, E. M.
Mean polarizability of molecules and anisotropy of the Lorentz tensor upon a nematic-smectic a phase transition: Their behavior in a homologous series / E.M. Aver'yanov // Russ. J. Phys. Chem. A. - 2012. - Vol. 86, Is. 5. - P. 720-728, DOI 10.1134/S0036024412050044. - Cited References: 37 . - ISSN 0036-0244

РУБ Chemistry, Physical + Anisotropy + Molecules + Phase transitions + Tensors
Рубрики:
CHOLESTERIC LIQUID-CRYSTALS
   REFRACTIVE-INDEX DATA
   A PHASE
   MESOMORPHIC PROPERTIES
   ORIENTATIONAL ORDER
   OPTICAL ANISOTROPY
   LOCAL-FIELD
   POLYMORPHISM
   TEMPERATURE
   A-monotone
   Alkyl chain
   Experimental values
   Homologous series
   Homologues
   Limiting values
   Lorentz
   Mesophases
   Molecular core
   Molecular polarizabilities
   Nematic
   Orientational order parameters
   Polarizabilities
   Polarizability density
   Quadratic dependence
   A-monotone
   Smectic
   Smectic phase
   Smectic phasis
   Smectic-A phasis
Кл.слова (ненормированные):
molecular polarizability -- anisotropy -- phase transition -- nematic -- smectic -- homologues
Аннотация: Experimental values of the mean polarizability of molecules, (gamma) over bar, and components of the Lorentz tensor, L-j, in the nematic and smectic A phases are obtained for a homologous series of n-alkyl-p-(4-ethoxybenzylideneamino)-alpha-methylcinnamates. Dependences of the (gamma) over bar and L-j values on the mesophase temperature, the orientational order parameter S of molecules, and the number n in the homologous series are revealed. The quadratic dependence of (gamma) over bar (S) in the nematic and smectic phases is established that is invariant with respect to the nematic-smectic A transition. Polarizability densities of the molecular core and the alkyl chain are found from the monotone decreasing dependence (gamma) over bar (n)/v (where v is volume per one molecule) in the smectic phase. The presence (or absence) of the odd-even alternation of L-j(n) in the nematic (smectic) phase is shown. A monotone decrease in the Lorentz tensor anisotropy L with an increase in n is revealed in the smectic phase, and limiting values L-j(n -> infinity) are determined.

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Публикация на русском языке Аверьянов, Евгений Михайлович. Изменение средней поляризуемости молекул и анизотропии тензора Лорентца при фазовом переходе нематик – смектик А и в гомологическом ряду [Текст] / Е.М. Аверьянов // Журн. физ. химии : Наука, 2012. - Т. 86 № 5. - С. 810-818

Доп.точки доступа:
Аверьянов, Евгений Михайлович
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    Lorentz microscopy of permalloy film microdots / V. S. Prokopenko [et al.] // J. Sib. Fed. Univ. Math. Phys. - 2013. - Vol. 6, Is. 2. - P. 262-269 ; Журн. СФУ. Сер. "Математика и физика" . - ISSN 1997-1397
   Перевод заглавия: Лоренцева микроскопия пермаллоевых пленочных микропятен
Кл.слова (ненормированные):
MICRODOT -- MAGNETIC VORTEX -- BLOCH POINT -- MAGNETIC REVERSAL -- НАНОТОЧКА -- МАГНИТНЫЙ ВИХРЬ -- ТОЧКА БЛОХА -- ПЕРЕМАГНИЧИВАНИЕ
Аннотация: The results of an investigation into square permalloy ﬁlm microdots with a quasivortical magnetic structure by the method of Lorentz electron microscopy are presented. The found before mechanism of the switching of microdot chirality in homogeneous plane magnetic ﬁeld is discussed. The calculations are performed to evaluate the interaction of microdots under switching chirality.
Приводятся результаты изучения методом лоренцевой электронной микроскопии квадратных пермаллоевых плёночных микропятен с квазивихревой магнитной структурой. Обсуждается механизм обнаруженного ранее эффекта переключения киральности пятна в однородном плоскостном магнитном поле. Выполнен расчёт по оценке взаимного влияния микропятен при переключении киральности.

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Доп.точки доступа:
Prokopenko, V. S.; Kim, P. D.; Ким, Петр Дементьевич; Orlov, V. A.; Орлов, Виталий Александрович; Vasiliev, B. V.; Vovk, D.K; Zatsepilin, S. T.; Rudenko, R. Y.; Руденко, Роман Юрьевич

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Lorentz electron-microscopy of amorphous films with perpendicular anisotropy / Y. M. Artemyev [et al.] // Fiz. Metallov Metalloved. - 1990. - Is. 2. - P. 77-84. - Cited References: 13 . - ISSN 0015-3230

РУБ Metallurgy & Metallurgical Engineering

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Доп.точки доступа:
Artemyev, Y. M.; Vershinina, L. I.; Вершинина, Людмила Иосифовна; Myagkov, V. G.; Мягков, Виктор Григорьевич; Sklyuyev, S. Z.; Frolov, G. I.; Фролов, Георгий Иванович; Yakovchuk, V. Yu.; Яковчук, Виктор Юрьевич
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    Lorentz's electron microscopy of thin films with frustrated magnetic structure / L. I. Kveglis [et al.] // Solid State Phenom. : Selected, peer reviewed papers. - 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P. 448-453, DOI 10.4028/www.scientific.net/SSP.215.448 . - ISSN 1662-9779. - ISSN 978-30383
   Перевод заглавия: Лоренцевская электронная микроскопия тонких пленок с фрустрированной магнитной структурой
Аннотация: The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfield's steel) are due to special modulated structure. The alloy is widely used in mechanical engineering. Complex studies of the structure and properties of the alloy both in bulk samples and thin-films are suggested to describe the formation of a deformation martensite structure in Fe86Mn13C alloy in the form of self-assembled clusters. It is shown that combinations of anti-ferromagnetic austenite and ferrimagnetic martensite of deformation create unique electric and magnetic properties of Fe86Mn13C alloy both in bulk and in a thin-film state. We seek to explain the reason for the change of the sign of thermoelectric effect depending on temperature. Our task is to investigate thin Fe86Mn13C films as a possible solution to the problems of spintronics.

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Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Kveglis, L. I.; Abylkalykova, R. B.; Djes, A. V.; Volochaev, M. N.; Cherkov, A. G.; Горев, Михаил Васильевич; Gorev, M. V.; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
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    Волочаев, Михаил Николаевич.
    Применение методов просвечивающей электронной микроскопии в материаловедении / М. Н. Волочаев // Решетневские чтения : материалы XIX Междунар. науч. конф. : в 2-х ч. - 2015. - Ч. 1. - С. 502-504. - Библиогр.: 2 . - ISSN 1990-7702
   Перевод заглавия: Applying transmission electron microscopy methods in material science
Кл.слова (ненормированные):
просвечивающая электронная микроскопия -- дифракция электронов -- рентгеноспектральный анализ -- лоренцева микроскопия -- transmission electron microscopy -- electron diffraction -- X-ray spectrum analysis -- Lorentz electron microscopy
Аннотация: Показаны примеры исследования различных материалов методами просвечивающей электронной микроскопии.
The examples of various materials are studied by transmission electron microscopy; they are demonstrated by the research.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Volochaev, M. N.; "Решетневские чтения", международная научно-практическая конференция(19 ; 2015 ; нояб. ; 10-14 ; Красноярск)
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Magnetic and EPR studies of the EuFe3(BO3)(4) single crystal / V. P. Dyakonov [et al.] // Eur. Phys. J. B. - 2010. - Vol. 78, Is. 3. - P. 291-298, DOI 10.1140/epjb/e2010-10059-3. - Cited References: 23. - A.A. Prokhorov is grateful to Mianowski Fund for financial support. . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
EARTH
GDFE3(BO3)(4)
MULTIFERROICS
Кл.слова (ненормированные):
Absorption lines -- Antiferromagnetic orderings -- Applied magnetic fields -- Basal planes -- Easy direction of magnetizations -- Electron paramagnetic resonance -- EPR measurements -- EPR spectra -- EPR studies -- Europium ions -- Exchange fields -- G factors -- Lorentz -- Magnetic measurements -- Magnetic subsystems -- Orientation dependence -- Sub-lattices -- Temperature dependence -- Temperature range -- Trigonal symmetry -- Zeeman effect -- Antiferromagnetism -- Crystal orientation -- Europium -- Magnetic fields -- Magnetic moments -- Magnetic variables measurement -- Magnetization -- Paramagnetic resonance -- Paramagnetism -- Single crystals -- Spectroscopy -- Electron spin resonance spectroscopy
Аннотация: Magnetic and electron paramagnetic resonance (EPR) properties of EuFe3(BO3)(4) single crystals have been studied over the temperature range of 300-4.2 K and in a magnetic field up to 5 T. The temperature, field and orientation dependences of susceptibility, magnetization and EPR spectra are presented. An antiferromagnetic ordering of the Fe subsystem occurs at about 37 K. The easy direction of magnetization perpendicular to the c axis is determined by magnetic measurements. Below 10 K, we observe an increase of susceptibility connected with the polarization of the Eu sublattice by an effective exchange field of the ordered Fe magnetic subsystem. In a magnetic field perpendicular to the c axis, we have observed an increase of magnetization at T < 10 K in the applied magnetic field, which can be attributed to the appearance of the magnetic moment induced by the magnetic field applied in the basal plane. According to EPR measurements, the distance between the maximum and minimum of derivative of absorption line of the Lorentz type is equal to 319 Gs. The anisotropy of g-factor and linewidth is due to the influence of crystalline field of trigonal symmetry. The peculiarities of temperature dependence of both intensity and linewidth are caused by the influence of excited states of europium ion (Eu3+). It is supposed that the difference between the g-factors from EPR and the magnetic measurements is caused by exchange interaction between rare earth and Fe subsystems via anomalous Zeeman effect.

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Держатели документа:
[Dyakonov, V. P.
Szymczak, R.
Berkowski, M.
Szymczak, H.] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[Dyakonov, V. P.
Prokhorov, A. D.
Zubov, E.
Prokhorov, A. A.
Varyukhin, V.] NANU, AA Galkin Donetsk Physicotech Inst, UA-83114 Donetsk, Ukraine
[Petrakovskii, G.
Bezmaternikh, L.] RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Physics, PAS, Al. Lotnikyw 32/46, Warsaw 02-668, Poland
A.A. Galkin Donetsk Physico-Technical Institute, NANU, R. Luxembourg str. 72, Donetsk 83114, Ukraine
L.V. Kirenski Institute of Physics, SB of RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Dyakonov, V. P.; Szymczak, R.; Prokhorov, A. D.; Zubov, E.; Prokhorov, A. A.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Berkowski, M.; Varyukhin, V.; Szymczak, H.
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Aver'yanov, E. M.
Local-Field Anisotropy of a Light Wave in Quasi-Two-Dimensional Soft-Matter Objects / E. M. Aver'yanov // J. Exp. Theor. Phys. - 2010. - Vol. 110, Is. 4. - P. 622-636, DOI 10.1134/S1063776110040102. - Cited References: 73. - This study was supported by the Presidium of the Russian Academy of Sciences within the Program of Basic Research (project no. 27.1) and the Siberian Branch of the Russian Academy of Sciences within the Program of Interdisciplinary Basic Research (project no. 5). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
INTEGRATED OPTICAL TECHNIQUES
   LANGMUIR-BLODGETT-FILMS
   SMECTIC LIQUID-CRYSTALS
   UNIAXIAL POLYMER-FILMS
   MOLECULAR-ORIENTATION
   INTERNAL FIELD
   DIELECTRIC-CONSTANT
   SPECTRAL FEATURES
   REFRACTIVE-INDEX
   THIN-FILMS
Кл.слова (ненормированные):
Anisotropic films -- Bilayer lipid membrane -- Chemical structure -- Comblike polymers -- Conductive Polymer -- Discotics -- Dispersion of refractive index -- Experimental data -- Experimental values -- Hexatic-B phase -- Isotropization -- Langmuir films -- Light wave -- Lorentz -- Macromolecular polymers -- Model approach -- Molecular polarizabilities -- Optical axis -- Order parameter -- Orientational order parameters -- Orientational orderings -- Orientational orders -- Smectic layers -- Smectic-A -- Smectics -- Soft matter -- Structural unit -- Sub-micron films -- Substrate types -- Tensor components -- Visible range -- Anisotropy -- Cell membranes -- Conductive plastics -- Conjugated polymers -- Electronic structure -- Light measurement -- Liquid crystal polymers -- Molecules -- Multilayer films -- Organic polymers -- Phase transitions -- Polarization -- Polymers -- Refractive index -- Substrates -- Tensors -- Two dimensional -- Conductive films
Аннотация: Experimental values of the Lorentz tensor components L-j for uniaxial quasi-two dimensional "soft matter" objects on substrates (bilayer lipid membranes, multilayer Langmuir films, smectics A, hexatic smectics B, submicron films of discotics Col(hd), micron anisotropic films of liquid-crystal comblike polymers and macromolecular polymers, submicron films of conjugated conductive polymers), freely suspended sub-micron films of smectics A, and uniaxially stretched micron films of conjugated conductive polymers have been determined using dispersion of refractive indices in the visible range. The dependences of the components L-j on the type of orientation (axial, planar) of uniaxial molecules (structural units of the film) with respect to the optical axis of the film, the film thickness, the substrate type, the chemical structure of molecules, and their long-range orientational order are established. It is revealed that the smectic A-hexatic B phase transition and two-dimensional crystallization of the smectic layer lead to changes in the components L-j due to the change in the orientational ordering of molecules as a result of the relation between the orientational and hexatic order parameters. All the above objects are characterized by isotropization of the Lorentz tensor L and the local-field tensor f with a simultaneous decrease in the birefringence of the sample and in the anisotropy of the molecular polarizability due to the change in the electronic structure of molecules. The correction for the anisotropy of the local-field tensor f to the orientational order parameter or the anisotropy of the molecular polarizability increases. The existing model approaches to calculating the components L-j for the objects under consideration are compared with the experimental data.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аверьянов, Евгений Михайлович
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Study of dependence upon the magnetic field and transport current of the magnetoresistive effect in YBCO-based bulk composites / D. A. Balaev [et al.] // Supercond. Sci. Technol. - 2007. - Vol. 20, Is. 6. - P. 495-499, DOI 10.1088/0953-2048/20/6/002. - Cited References: 25 . - ISSN 0953-2048

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
CERAMIC SUPERCONDUCTORS
   DISSIPATION
   TRANSITION
   SENSORS
   MOTION
   FILMS
Кл.слова (ненормированные):
Current voltage characteristics -- Lorentz force -- Magnetic field effects -- Magnetic flux -- Magnetic sensors -- Magnetoresistance -- Intergrain boundaries -- Magnetic field sensor devices -- Magnetoresistance curves -- Magnetoresistive properties -- Yttrium barium copper oxides
Аннотация: The magnetoresistive properties of bulk YBCO + CuO and YBCO + BaPb0.75Sn0.25O3 composites for different orientations of external magnetic field H and macroscopic transport current j have been measured. These composites exhibit large magnetoresistance in weak magnetic fields (< 100 Oe), which makes them promising candidates for practical application in magnetic field sensor devices. The difference between.( T) dependences, magnetoresistance curves R( H) and current - voltage characteristics measured for H parallel to j and H || j is observed indicating the presence of the Lorentz- force- dependent dissipation in the composites. Angular dependences of magnetoresistance R(theta) ( where theta = angle H, j) of the composites in weak magnetic fields are found to be proportional to sin(2)theta. This fact suggests that the flux flow in the intergrain boundaries is responsible for the large magnetoresistive effect observed in the composites.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Prus, A. G.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Petrov, M. I.; Петров, Михаил Иванович
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Aver'yanov, E. M.
Long-Range Orientational Order, Local-Field Anisotropy, and Mean Molecular Polarizability in Liquid Crystals / E. M. Aver'yanov // J. Exp. Theor. Phys. - 2009. - Vol. 108, Is. 1. - P. 176-186, DOI 10.1134/S106377610901021X. - Cited References: 35 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
REFRACTIVE-INDEXES
OPTICAL ANISOTROPY
Кл.слова (ненормированные):
Anisotropy -- Crystal symmetry -- Crystals -- Electric fields -- Light sources -- Liquid crystals -- Liquids -- Molecules -- Tensors -- Biaxial liquid crystals -- Calamitic -- Discotic -- Discotic liquid crystals -- Experimental datum -- Field models -- Lorentz -- Mesoscopic -- Molecular polarizability -- Orientational orders -- Phase state -- Nematic liquid crystals
Аннотация: The problems on the relation of the mean effective molecular polarizability (gamma) over bar to the long-range orientational order of molecules (the optical anisotropy of the medium) in uniaxial and biaxial liquid crystals, the local anisotropy on mesoscopic scales, and the anisotropy of the Lorentz tensor L and the local-field tensor f are formulated and solved. It is demonstrated that the presence of the long-range orientational order of molecules in liquid crystals imposes limitations from below on the molecular polarizability (gamma) over bar, which differs for uniaxial and biaxial liquid crystals. The relation between the local anisotropy and the molecular polarizability (gamma) over bar is investigated for calamitic and discotic uniaxial liquid crystals consisting of lath- and disk-shaped molecules. These liquid crystals with identical macroscopic symmetry differ in the local anisotropy and the relationships between the components L(parallel to) L(perpendicular to,) f(parallel to) > f(perpendicular to) (discotic) for an electric field oriented parallel and perpendicular to the director. The limitations from below and above on the molecular polarizability (gamma) over bar due to the anisotropy of the tensors L and f are established for liquid crystals of both types. These limitations indicate that the molecular polarizability (gamma) over bar depends on the phase state and the temperature. The factors responsible for the nonphysical consequences of the local-field models based on the approximation (gamma) over bar = const are revealed. The theoretical inferences are confirmed by the experimental data for a number of calamitic nematic liquid crystals with different values of birefringence and the discotic liquid crystal Col(ho).

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аверьянов, Евгений Михайлович
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10.

Magnetic domain structure study of epitaxial Fe3Si (111) thin films / M. N. Volochaev [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P6.8. - P. 316. - References: 3. - This work was supported by RFBR grant № 16-32-00291and the RF Education and Science Ministry grant №16.663.2014K . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
Fe3Si thin films -- magnetic domain structure -- Lorentz microscopy

Доп.точки доступа:
Volochaev, M. N.; Волочаев, Михаил Николаевич; Tarasov, I. A.; Тарасов, Иван Анатольевич; Yakovlev, I. A.; Яковлев, Иван Александрович; Loginov, Yu. Yu.; Логинов Ю. Ю.; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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