Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.06.55651.09h
Андрей Фещенко, М. Е. Москалев, А. Н. Горьковенко, В. Н. Лепаловский, Екатерина Андреевна Степанова, Е. А. Кравцов, В. О. Васьковский
This paper presents a detailed study of the hysteresis properties of film structures based on bilayers of the (Cr-Mn)/Fe type. The temperature dependences of several parameters of the hysteresis loops of the Fe layers are determined for films varying in the composition and thickness of the Cr-Mn layer, as well as in the structure of buffer coatings. The compositional and temperature intervals of the existence of the antiferromagnetic ordering in the Cr-Mn layer and the related features of the temperature changes in the coercive force, its anisotropy in the plane of the films and the exchange bias field are established. The causal analysis of the established regularities is performed.
{"title":"Особенности проявления антиферромагнетизма сплава Cr-Mn в составе пленочных композитов типа (Cr-Mn)/Fe","authors":"Андрей Фещенко, М. Е. Москалев, А. Н. Горьковенко, В. Н. Лепаловский, Екатерина Андреевна Степанова, Е. А. Кравцов, В. О. Васьковский","doi":"10.21883/ftt.2023.06.55651.09h","DOIUrl":"https://doi.org/10.21883/ftt.2023.06.55651.09h","url":null,"abstract":"This paper presents a detailed study of the hysteresis properties of film structures based on bilayers of the (Cr-Mn)/Fe type. The temperature dependences of several parameters of the hysteresis loops of the Fe layers are determined for films varying in the composition and thickness of the Cr-Mn layer, as well as in the structure of buffer coatings. The compositional and temperature intervals of the existence of the antiferromagnetic ordering in the Cr-Mn layer and the related features of the temperature changes in the coercive force, its anisotropy in the plane of the films and the exchange bias field are established. The causal analysis of the established regularities is performed.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83904400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.03.54740.532
В.Д. Пойманов
The scattering of exchange spin waves caused by the interface between antiferromagnetically ordered magnetic media is studied. It is shown that, in contrast to the case of uniaxial magnets, when the scattered wave is evanescent, in this case, emission of a propagated wave is possible, the amplitude of which is determined by the difference between the biaxial anisotropy constants.
{"title":"Рассеяние обменных спиновых волн границей раздела двуосных ферромагнетиков со взаимным антиферромагнитным упорядочением","authors":"В.Д. Пойманов","doi":"10.21883/ftt.2023.03.54740.532","DOIUrl":"https://doi.org/10.21883/ftt.2023.03.54740.532","url":null,"abstract":"The scattering of exchange spin waves caused by the interface between antiferromagnetically ordered magnetic media is studied. It is shown that, in contrast to the case of uniaxial magnets, when the scattered wave is evanescent, in this case, emission of a propagated wave is possible, the amplitude of which is determined by the difference between the biaxial anisotropy constants.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89748468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.01.53931.498
Николай Иванович Сорокин, Н. А. Ивановская, И. И. Бучинская
The impedance spectroscopy in the temperature range 302–779 K was used to study the ionic conductivity of the Pr0.9Pb0.1F2.9 nanoceramics, obtained by cold pressing of the powder, mechanically synthesized from components of PbF2 and PrF3. The studied material is the solid solution with tysonite-type structure (sp. gr. P-3c1, Z = 6) and lattice parameters a = 7.0906(4) and c = 7.2538(4) A. With increasing temperature, the conductivity of the ceramic increases from 1.9 × 10–5 to 6.7 × 10–2 S/cm, and the activation enthalpy of ion transport Hσ = 0.407 ± 0.005 and 0.345 ± 0.005 eV at 302–502 and 502–779 K, respectively. The electrical conductivity mechanism is due to the migration of fluorine vacancies along the boundaries of nanocrystalline grains. The intragranular conductivity of ceramics is close to the electrical conductivity of a single crystal of the same composition. Cold pressed ceramics Pr0.9Pb0.1F2.9 can be used as a promising solid electrolyte in ”room" fluorine-ion current sources.
{"title":"Ионная проводимость нанокерамики холодного прессования Pr-=SUB=-0.9-=/SUB=-Pb-=SUB=-0.1-=/SUB=-F-=SUB=-2.9-=/SUB=-, полученной механосинтезом компонентов","authors":"Николай Иванович Сорокин, Н. А. Ивановская, И. И. Бучинская","doi":"10.21883/ftt.2023.01.53931.498","DOIUrl":"https://doi.org/10.21883/ftt.2023.01.53931.498","url":null,"abstract":"The impedance spectroscopy in the temperature range 302–779 K was used to study the ionic conductivity of the Pr0.9Pb0.1F2.9 nanoceramics, obtained by cold pressing of the powder, mechanically synthesized from components of PbF2 and PrF3. The studied material is the solid solution with tysonite-type structure (sp. gr. P-3c1, Z = 6) and lattice parameters a = 7.0906(4) and c = 7.2538(4) A. With increasing temperature, the conductivity of the ceramic increases from 1.9 × 10–5 to 6.7 × 10–2 S/cm, and the activation enthalpy of ion transport Hσ = 0.407 ± 0.005 and 0.345 ± 0.005 eV at 302–502 and 502–779 K, respectively. The electrical conductivity mechanism is due to the migration of fluorine vacancies along the boundaries of nanocrystalline grains. The intragranular conductivity of ceramics is close to the electrical conductivity of a single crystal of the same composition. Cold pressed ceramics Pr0.9Pb0.1F2.9 can be used as a promising solid electrolyte in ”room\" fluorine-ion current sources.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86680688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.02.54297.505
И. А. Гудим, Е. В. Еремин, Н.В. Михашенок, В.Р. Титова
Монокристаллы GdFe3(BO3)4 выращены из растворов-расплавов на основе тримолибдата висмута и вольфрамата лития. Монокристаллы ферробората гадолиния из литиево-вольфраматного раствор-расплава были выращены впервые. Проведено сравнение магнитных свойств выращенных кристаллов. Показано, что в ферроборате GdFe3(BO3)4, полученном с использованием тримолибдат висмутового раствор-расплава, присутствуют примеси ионов Bi3+ (6% at.), которые замещают ионы Gd3+. Тогда как ферроборат GdFe3(BO3)4, выращенном из раствор-расплава на основе вольфрамата лития, по-видимому, подобных неконтролируемых примесей не содержит. Ключевые слова: рост кристаллов, антиферромагнетики, мультферроики.
{"title":"Сравнение магнитных свойств ферроборатов GdFe-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-, выращенных с использованием различных растворителей","authors":"И. А. Гудим, Е. В. Еремин, Н.В. Михашенок, В.Р. Титова","doi":"10.21883/ftt.2023.02.54297.505","DOIUrl":"https://doi.org/10.21883/ftt.2023.02.54297.505","url":null,"abstract":"Монокристаллы GdFe3(BO3)4 выращены из растворов-расплавов на основе тримолибдата висмута и вольфрамата лития. Монокристаллы ферробората гадолиния из литиево-вольфраматного раствор-расплава были выращены впервые. Проведено сравнение магнитных свойств выращенных кристаллов. Показано, что в ферроборате GdFe3(BO3)4, полученном с использованием тримолибдат висмутового раствор-расплава, присутствуют примеси ионов Bi3+ (6% at.), которые замещают ионы Gd3+. Тогда как ферроборат GdFe3(BO3)4, выращенном из раствор-расплава на основе вольфрамата лития, по-видимому, подобных неконтролируемых примесей не содержит. Ключевые слова: рост кристаллов, антиферромагнетики, мультферроики.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"208 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80548488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.02.54307.530
В. А. Важенин, А. В. Фокин, А. П. Потапов, М.Ю. Артёмов
Исследовано ориентационное поведение ЭПР-переходов неконтролируемых примесных центров V4+ (S=1/2) и Fe3+ (S=5/2) в монокристалле Na5AlF2(PO4)2, легированном хромом. Определены параметры спинового гамильтониана этих центров как в лабораторной (кристаллографической), так и в локальной системах координат. Основываясь на факте существования смешанных ванадат-фосфатов и учитывая ориентацию главной оси V4+ сделан вывод о замещении ванадием позиции фосфора. Обнаружена близость главных осей тензоров тонкой структуры второго и четвертого ранга центров Fe3+ к направлению F-F фтор-кислородного октаэдра, окружающего ион железа. Ключевые слова: примесные ионы, парамагнитный резонанс, сверхтонкое взаимодействие.
{"title":"Парамагнитные центры ванадия и железа в монокристалле Na-=SUB=-5-=/SUB=-AlF-=SUB=-2-=/SUB=-(PO-=SUB=-4-=/SUB=-)-=SUB=-2-=/SUB=-","authors":"В. А. Важенин, А. В. Фокин, А. П. Потапов, М.Ю. Артёмов","doi":"10.21883/ftt.2023.02.54307.530","DOIUrl":"https://doi.org/10.21883/ftt.2023.02.54307.530","url":null,"abstract":"Исследовано ориентационное поведение ЭПР-переходов неконтролируемых примесных центров V4+ (S=1/2) и Fe3+ (S=5/2) в монокристалле Na5AlF2(PO4)2, легированном хромом. Определены параметры спинового гамильтониана этих центров как в лабораторной (кристаллографической), так и в локальной системах координат. Основываясь на факте существования смешанных ванадат-фосфатов и учитывая ориентацию главной оси V4+ сделан вывод о замещении ванадием позиции фосфора. Обнаружена близость главных осей тензоров тонкой структуры второго и четвертого ранга центров Fe3+ к направлению F-F фтор-кислородного октаэдра, окружающего ион железа. Ключевые слова: примесные ионы, парамагнитный резонанс, сверхтонкое взаимодействие.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72718829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.01.53921.463
А.В. Мясоедов, Иван Сергеевич Павлов, А.И. Печников, В. И. Николаев
The conditions have been established for detection and recognition of rotation domains in α–Ga2O3/α–Al2O3 (0001) thin films in the presence of other polymorphs. The domains are visualized by high-resolution transmission electron microscopy. Their structural characteristics are determined by preparing cross-sectional and plan-view specimens, choosing the correct diffraction conditions and proper imaging modes. As a result, the dimensions, the spatial distribution, the volume fraction and area fraction of the inclusions of domains have been determined.
{"title":"Выявление и исследование 60-=SUP=-o-=/SUP=--поворотных доменов в α-Ga-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- методом просвечивающей электронной микроскопии","authors":"А.В. Мясоедов, Иван Сергеевич Павлов, А.И. Печников, В. И. Николаев","doi":"10.21883/ftt.2023.01.53921.463","DOIUrl":"https://doi.org/10.21883/ftt.2023.01.53921.463","url":null,"abstract":"The conditions have been established for detection and recognition of rotation domains in α–Ga2O3/α–Al2O3 (0001) thin films in the presence of other polymorphs. The domains are visualized by high-resolution transmission electron microscopy. Their structural characteristics are determined by preparing cross-sectional and plan-view specimens, choosing the correct diffraction conditions and proper imaging modes. As a result, the dimensions, the spatial distribution, the volume fraction and area fraction of the inclusions of domains have been determined.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79174997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.06.55648.05h
П. В. Купцов
Two uniaxial spin transfer oscillators with field coupling and RLC loads are considered. This system can demonstrate synchronized as well as non-synchronized oscillations. There is an area of bistability in the parameter space where these two regimes coexist. The mechanism of the bistability control is suggested. It is shown that if the RLC circuits are tuned in such a way that after the start their currents slowly and monotonically decay from high negative magnitudes to zero the oscillators forget their initial states and arrive at the vicinities of their fixed points. It provides the controllable start of the oscillations so that the bistability is suppressed in favor of either synchronous or non-synchronous regimes.
{"title":"Управление бистабильностью в системе двух одноосных спин-трансферных осцилляторов с полевой связью и RLC-нагрузкой","authors":"П. В. Купцов","doi":"10.21883/ftt.2023.06.55648.05h","DOIUrl":"https://doi.org/10.21883/ftt.2023.06.55648.05h","url":null,"abstract":"Two uniaxial spin transfer oscillators with field coupling and RLC loads are considered. This system can demonstrate synchronized as well as non-synchronized oscillations. There is an area of bistability in the parameter space where these two regimes coexist. The mechanism of the bistability control is suggested. It is shown that if the RLC circuits are tuned in such a way that after the start their currents slowly and monotonically decay from high negative magnitudes to zero the oscillators forget their initial states and arrive at the vicinities of their fixed points. It provides the controllable start of the oscillations so that the bistability is suppressed in favor of either synchronous or non-synchronous regimes.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78781032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.01.53917.477
Анна Викторовна Пономарева
The effect of tungsten alloying on the elastic properties of B2 NiAl at low-temperature and high-temperature distribution of W atoms on sublattices. By means of the exact muffin-tin orbitals method in conjunction with the coherent potential approximation, the constants C11, C12, C44, Young's modulus E, shear modulus G, Cauchy pressure values, G/B ratios are calculated. Using phenomenological criteria of the correlation between ductility and elastic properties of solution phases, it has been shown that the addition of tungsten could yield improved ductility for B2 NiAl in both types of alloys. It is established that with the high-temperature distribution of W atoms on the Al sublattice, there is a loss of mechanical stability and a decrease in mechanical properties with increasing W concentration. In alloys with a low–temperature distribution of tungsten atoms between Al and Ni sites a unique combination of properties occurs: in addition to the ductility enhancement, a simultaneous increase of the elastic constants C44 and C11, shear modulus G, Young modulus E with increasing W content is observed. The differences in the behavior of elastic constants in alloys with different types of tungsten distribution on NiAl sublattices are analyzed by calculating the density of electronic states.
{"title":"Упругие свойства B2-NiAl с добавлением W: исследование из первых принципов","authors":"Анна Викторовна Пономарева","doi":"10.21883/ftt.2023.01.53917.477","DOIUrl":"https://doi.org/10.21883/ftt.2023.01.53917.477","url":null,"abstract":"The effect of tungsten alloying on the elastic properties of B2 NiAl at low-temperature and high-temperature distribution of W atoms on sublattices. By means of the exact muffin-tin orbitals method in conjunction with the coherent potential approximation, the constants C11, C12, C44, Young's modulus E, shear modulus G, Cauchy pressure values, G/B ratios are calculated. Using phenomenological criteria of the correlation between ductility and elastic properties of solution phases, it has been shown that the addition of tungsten could yield improved ductility for B2 NiAl in both types of alloys. It is established that with the high-temperature distribution of W atoms on the Al sublattice, there is a loss of mechanical stability and a decrease in mechanical properties with increasing W concentration. In alloys with a low–temperature distribution of tungsten atoms between Al and Ni sites a unique combination of properties occurs: in addition to the ductility enhancement, a simultaneous increase of the elastic constants C44 and C11, shear modulus G, Young modulus E with increasing W content is observed. The differences in the behavior of elastic constants in alloys with different types of tungsten distribution on NiAl sublattices are analyzed by calculating the density of electronic states.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81203940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.08.56162.87
Д.П. Бернацкий, В. Г. Павлов
Using field desorption microscopy, it is shown that the nature of desorption by an electric field of adsorbed barium atoms on a quasi-spherical surface of a rhenium single crystal that is inhomogeneous in work function depends on the rate of diffusion of adsorbate atoms over the surface. In the absence of diffusion of barium atoms over the surface (T = 300 K), a pulse character of desorption is observed. At rhenium temperature T = 700 K migration equilibrium is established on the surface, at which the concentration of barium adatoms on the faces of a rhenium single crystal can be different. It has been shown that in this case, a stationary field desorption mode is realized, in which the emission of barium ions comes from faces with higher work function.
{"title":"Диффузия и полевая десорбция атомов бария с неоднородной поверхности рения","authors":"Д.П. Бернацкий, В. Г. Павлов","doi":"10.21883/ftt.2023.08.56162.87","DOIUrl":"https://doi.org/10.21883/ftt.2023.08.56162.87","url":null,"abstract":"Using field desorption microscopy, it is shown that the nature of desorption by an electric field of adsorbed barium atoms on a quasi-spherical surface of a rhenium single crystal that is inhomogeneous in work function depends on the rate of diffusion of adsorbate atoms over the surface. In the absence of diffusion of barium atoms over the surface (T = 300 K), a pulse character of desorption is observed. At rhenium temperature T = 700 K migration equilibrium is established on the surface, at which the concentration of barium adatoms on the faces of a rhenium single crystal can be different. It has been shown that in this case, a stationary field desorption mode is realized, in which the emission of barium ions comes from faces with higher work function.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75544900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/ftt.2023.01.53922.457
И.А. Зур, Е.Е. Шманай, Ю. А. Федотова, А. А. Харченко, С. А. Мовчан
The relationship between sp^2/sp^3 hybridizations ratio of atomic bonds in diamond-like carbon (DLC) and its electrical resistivity for coatings with a thickness in the range 22-70 nm prepared by vacuum arc deposition on silicon substrate of the SHB-8 brand has been established. It is established, that an increase in the coating thickness from 22 to 70 nm is accompanied by a decrease in the specific transverse electrical resistance of samples from 17 to 2 GOhm·m. This effect is explained by an increase in the proportion of carbon atoms with sp^2 hybridization of electronic orbitals from 86 to 91%, which leads to the appearance of an additional number of π-bonds. A mathematical model, describing the spatial distribution of current when measuring transverse I-V characteristic, has been developed. The results obtained will be useful in creating resistive layers on the electrodes of gas-discharge detectors of charged particle to limit the amount of current in the event of rare spark discharges inside them caused by the registration of random highly ionizing particles.
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