Физика твердого тела最新文献_第7页

Электронная структура и рентгеноспектральные характеристики полупроводниковой и металлической фаз дисилицида железа 半导体和金属二氧化铁相的电子结构和x射线特征

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.01.53916.474

Г.П. Потуданский, С. И. Курганский

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Влияние взаимного направления поляризатора и свободного слоя на автогенерацию магнитных туннельных переходов (МТП) разной геометрии 极化器和自由层相互作用对不同几何形状的磁隧道跃迁自动产生的影响

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.06.55646.03h

В.Р. Киктева, К.В. Киселева, Г.А. Кичин, П.Н. Скирдков, Константин Анатольевич Звездин

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Численное моделирование поведения энстатита до 1.4 TPa

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.06.55668.38

К. К. Маевский

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Особенности изменения интенсивностей основных полос фотолюминесценции ионов Tb-=SUP=-3+-=/SUP=- и их сателлитов в поликристаллическом люминофоре Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-:Tb(3 mol%) Tb-=SUP -= -3+-=/SUP -及其卫星在多结晶发光灯Gd- 2 = =SUB -3 = =SUB -3 = =SUB -3 = =SUB - 3% (mol%)中的强度变化

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.05.55502.37

В. В. Баковец, П. Е. Плюснин, И. В. Юшина, М. И. Рахманова, А. В. Сотников, И.П. Долговесова, Т.Д. Пивоварова

{"title":"Особенности изменения интенсивностей основных полос фотолюминесценции ионов Tb-=SUP=-3+-=/SUP=- и их сателлитов в поликристаллическом люминофоре Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-:Tb(3 mol%)","authors":"В. В. Баковец, П. Е. Плюснин, И. В. Юшина, М. И. Рахманова, А. В. Сотников, И.П. Долговесова, Т.Д. Пивоварова","doi":"10.21883/ftt.2023.05.55502.37","DOIUrl":"https://doi.org/10.21883/ftt.2023.05.55502.37","url":null,"abstract":"Samples of Gd2O3:Tb(3 mol%) phosphor were obtained by sol-gel method followed by annealing at 800oC and 1200oC in air. At high annealing temperature, the intensities of the main emission bands 484 and 541 nm increase, but the ratio of the intensities of these emission bands to their satellites 493 and 549 nm respectively decreases. Based on the analysis of X-ray diffractometry, radiation spectra, far-infrared and Raman spectroscopy, as well as diffuse reflectance spectroscopy, we established: the increase in the crystallinity of the samples with a significant reduction of the lattice strain stress at elevated annealing temperatures, changes in the structure of the bandgap with degenerated acceptor and donor zones of impurities Tb4+ and Tb3+ respectively. The diffuse reflection spectra of the sample after annealing at 800oC under optical excitation showed a direct charge transition through the bandgap with Eg = 2.56 eV. After elevated annealing temperature the concentration of Tb4+ ions decreases due to reduction to Tb3+. As a result, at low excitation energies the degeneracy of the acceptor zone is still preserved and there is a direct transition of charges through the bandgap with Eg = 2.55 eV. At high excitation energies the degeneracy of the acceptor zone is removed and there is a direct transition through the bandgap with Eg = 3.39 eV. These effects are accompanied by a relatively large increase in the emission intensity of the satellites, especially at the 549 nm.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83167315","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}

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Электропроводность и интерфейсные явления в тонкопленочных гетероструктурах на основе ниобата лития и танталата лития 薄膜异质结构中的电导率和界面现象

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.04.55294.7

С.И. Гудков, А. В. Солнышкин, Р. Н. Жуков, Д. А. Киселев, Е. М. Семенова, А. Н. Белов

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Магнитные свойства и магнитокалорический эффект в пленках и микропроводах Gd 胶片和微导线的磁性和磁热效应

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.03.54741.538

О. В. Коплак, С.H. Кашин, Д. В. Королев, М. В. Жидков, В.П. Пискорский, Р. А. Валеев, Роман Борисович Моргунов

{"title":"Магнитные свойства и магнитокалорический эффект в пленках и микропроводах Gd","authors":"О. В. Коплак, С.H. Кашин, Д. В. Королев, М. В. Жидков, В.П. Пискорский, Р. А. Валеев, Роман Борисович Моргунов","doi":"10.21883/ftt.2023.03.54741.538","DOIUrl":"https://doi.org/10.21883/ftt.2023.03.54741.538","url":null,"abstract":"An analysis of the temperature and field dependences of the magnetization of Gd films and microwires was carried out, as well as an isothermal measurement of the magnetic part of the entropy at the Curie temperature. The magnetocaloric effect (MCE), measured as an isothermal increase in the magnetic part of the entropy, in microwires shows two peaks on the temperature dependence of the magnetic part of the entropy, in contrast to one peak in films. In films and microwires, the entropy maximum at 286–293 K, which corresponds to the Curie temperature, depends on the magnetic field, shifting in the same way in films and microwires with an increase in the field at the orientation of the MgO (111) substrate, which provides the maximum mechanical stresses in Gd. In microwires, the second maximum does not change the temperature of 320 K as the field increases to 9 T, but its amplitude increases linearly with the field. This maximum can be caused by a spin-reorientation transition.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91256203","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}

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Формирование обменного смещения и анизотропия формы в микрообъектах на основе спиновых клапанов 自旋阀型微型物体形状的交换位移和各向异性形成

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.08.56152.76

А.А. Гермизина, Л. И. Наумова, М. А. Миляев, Р. С. Заворницын, А. И. Павлова, И. К. Максимова, В. В. Проглядо, И. Ю. Каменский, Владимир Васильевич Устинов

{"title":"Формирование обменного смещения и анизотропия формы в микрообъектах на основе спиновых клапанов","authors":"А.А. Гермизина, Л. И. Наумова, М. А. Миляев, Р. С. Заворницын, А. И. Павлова, И. К. Максимова, В. В. Проглядо, И. Ю. Каменский, Владимир Васильевич Устинов","doi":"10.21883/ftt.2023.08.56152.76","DOIUrl":"https://doi.org/10.21883/ftt.2023.08.56152.76","url":null,"abstract":"Rhombus-shaped microobjects formed by strips of two micrometers wide were fabricated from the spin valve film. The influence of the shape anisotropy on the layers magnetic moment rotation during the spin valve magnetic reversal is studied. A method for two-stage thermomagnetic treatment in a direction-fixed magnetic field has been found. The method allows to obtain the opposite sign values of the exchange bias fields in the non-parallel rhombus sides. The direction of the formed exchange bias is determined by the deviation of the strip from the uniaxial anisotropy axis and from the magnetic field applied during thermomagnetic treatment. Based on a rhombus-shaped microobject made from a single spin valve film, the device is a Full Wheatstone bridge. Each side of the rhombus is an active magnetically sensitive element.","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":"84843689","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}

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Воздействие слабого импульсного магнитного поля на ионную проводимость суперионного проводника Pb-=SUB=-0.67-=/SUB=-Cd-=SUB=-0.33-=/SUB=-F-=SUB=-2-=/SUB=- 脉冲磁场对超导电性Pb-= -0.67-= -Cd-=SUB - 33-= =SUB -2-= =SUB -

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.09.56249.72

Николай Иванович Сорокин, В. М. Каневский

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Исследования магнитных наночастиц Mn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=-@OA (0≤ x≤ 1.0) функционализированных олеиновой кислотой (ОА) для биомедицинских применений

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.08.56165.127

А.С. Камзин, N. Dogan, O.M. Dogan, В. Г. Семенов

{"title":"Исследования магнитных наночастиц Mn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=-@OA (0≤ x≤ 1.0) функционализированных олеиновой кислотой (ОА) для биомедицинских применений","authors":"А.С. Камзин, N. Dogan, O.M. Dogan, В. Г. Семенов","doi":"10.21883/ftt.2023.08.56165.127","DOIUrl":"https://doi.org/10.21883/ftt.2023.08.56165.127","url":null,"abstract":"Functionalization (or coverage) MNF is a unique tool for creating particles with the properties required for biomedical applications. Therefore, the study of the magnetic properties of coated MNCs is the most important task of our time. The effect of changes in the concentration of Mn ions on the properties of MnxFe3-xO4 nanoparticles coated with oleic acid (OA) MnxFe3-xO4@OA (where x = 0, 0.25, 0.5, 0.75 and 1.0) to create stabilized magnetic fluids for various applications is investigated. The synthesis of MnxFe3-xO4@OA MNPs was carried out by thermal decomposition using manganese-oleate and iron oleate. The properties and phase states of the obtained MNPs were studied by X-ray diffraction (XRD) and Mossbauer spectroscopy. To understand the behavior of MNCs in small magnetic fields during hyperthermic treatment, Mossbauer studies of MnxFe3-xO4@OA particles were carried out when a magnetic field with a strength of 1.7 kOe was applied. It is established that the thermal decomposition method makes it possible to obtain single-phase superparamagnetic particles promising for biomedical applications","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81305356","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}

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Подвижность носителей заряда в монокристалле и нанокерамике ионного проводника Sr-=SUB=-1-x-=/SUB=-Y-=SUB=-x-=/SUB=-F-=SUB=-2+x-=/SUB=- (x=0.3) 电荷载体在单晶体和纳米陶瓷导体Sr- 1-x-= -Y- x-= =SUB -x-= =SUB

Физика твердого тела Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.06.55662.71

Николай Иванович Сорокин

{"title":"Подвижность носителей заряда в монокристалле и нанокерамике ионного проводника Sr-=SUB=-1-x-=/SUB=-Y-=SUB=-x-=/SUB=-F-=SUB=-2+x-=/SUB=- (x=0.3)","authors":"Николай Иванович Сорокин","doi":"10.21883/ftt.2023.06.55662.71","DOIUrl":"https://doi.org/10.21883/ftt.2023.06.55662.71","url":null,"abstract":"The heterovalent solid solution Sr1−xYxF2+x with fluorite structure (sp. gr. Fm-3m) can be synthesized in single-crystal and nanoceramic forms. Comparison of their electrical properties shows that nanoceramics have a higher ionic conductivity than single crystals the same composition. In the single-crystal state of the solid solution, the migration mechanism dominates interstitial ions F' in the bulk of the sample, in the nanoceramic state ther is the vacancy migration mechanism V• along the grain boundaries of the sample. Using electrophysical and structural data, we calculated mobility μmob and concentration nmob of ionic charge carriers in a single crystal (a = 0.5722 nm) and ceramics (a = 0.57442 nm) of composition Sr0.7Y0.3F2.3. The defect mobility F′ (μmob = 4.5 10−10 cm2/(V s) at 500 K) in a single crystal is less than the mobility of vacancies V• in nanoceramics by 140 times. The concentration charge carriers is nmob = 1.1 1021 and 6.9 1021 cm-3 (2.2 and 14.2% of the total number of anions) for single crystal and nanoceramics, respectively.","PeriodicalId":24077,"journal":{"name":"Физика твердого тела","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81574103","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}

引用次数: 0