Bulletin of the Russian Academy of Sciences: Physics最新文献

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The Ferromagnetic Resonance and Probe Microscopy Studies of Temperature-Induced Uniaxial Deformations in Planar Ferromagnetic Microparticles 平面铁磁微粒中温度诱导单轴变形的铁磁共振和探针显微镜研究

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707098

N. I. Nurgazizov, D. A. Bizyaev, A. P. Chuklanov, A. A. Bukharaev, L. V. Bazan, V. Ya. Shur, A. R. Akhmatkhanov

Abstract

Square planar nickel microparticles deposited on the surface of single crystals of lithium niobate in the hexagonal phase and potassium titanyl phosphate were studied. Because the thermal expansion coefficients of these single crystals strongly differ, the uniaxial anisotropy is induced in the microparticles by heating or cooling relative to the deposition temperature. The phenomenon of the induction of anisotropy was explored using magnetic force microscopy and ferromagnetic resonance spectroscopy. Data obtained from ferromagnetic resonance spectra show that, in the ensemble of microparticles, with increasing temperature of the samples from –10 to 60°C, the axis of anisotropy rotates by 90°. This agrees well with the data about the domain structure of an individual microparticle, obtained by magnetic force microscopy.

摘要研究了沉积在六方相铌酸锂单晶和磷酸钛钾单晶表面的方形镍微粒。由于这些单晶体的热膨胀系数差别很大，因此通过相对于沉积温度的加热或冷却会在微颗粒中诱导出单轴各向异性。我们使用磁力显微镜和铁磁共振波谱探究了诱导各向异性的现象。从铁磁共振光谱中获得的数据显示，在微粒子集合体中，随着样品温度从-10°C 升至 60°C，各向异性轴旋转了 90°。这与通过磁力显微镜获得的单个微粒的畴结构数据十分吻合。

引用次数: 0

Relaxation of Multiple-Quantum Coherences in Dipolar Coupled 1H Spin Pairs in Gypsum 石膏中双极性耦合 1H 自旋对中的多量子相干弛豫

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707153

E. B. Fel’dman, E. I. Kuznetsova, A. V. Fedorova, K. V. Panicheva, S. G. Vasil’ev, A. I. Zenchuk

Abstract

The evolution and relaxation of MQ NMR coherences on the preparation period were investigated experimentally on a single crystal of gypsum, CaSO₄·2H₂O. The theory describing the dynamics of MQ coherences on the preparation period of MQ experiment for a pair of spins was developed based on the Lindblad master equation. This theory predicts the appearance of MQ coherences of only zeroth and second orders, oscillatory exchange of their intensities and exponential decay with increasing of the preparation time. The proposed theory describes the experimental data well. It is shown that the frequency of oscillations depends on the orientation of the crystal in the external magnetic field and determined by the dipolar coupling between protons of the water molecules contained in the gypsum crystal. The relaxation time of MQ coherences of zeroth and second orders, T_r = 150 ± 15 μs, were independent of the crystal orientation, which suggest a common source of relaxation due to the dipole-dipole interactions with protons surrounding water molecule.

摘要在石膏（CaSO4-2H2O）单晶体上对 MQ NMR 相干性在准备期的演变和弛豫进行了实验研究。在林德布拉德主方程的基础上，建立了描述一对自旋 MQ 实验准备期 MQ 相干性动态的理论。该理论预测了 MQ 相干只出现零阶和二阶、其强度的振荡交换以及随着制备时间的增加而出现的指数衰减。所提出的理论很好地描述了实验数据。研究表明，振荡频率取决于晶体在外部磁场中的取向，并由石膏晶体中所含水分子质子之间的双极耦合决定。MQ 相干的零阶和二阶弛豫时间（Tr = 150 ± 15 μs）与晶体取向无关，这表明弛豫的共同来源是水分子周围质子的偶极-偶极相互作用。

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引用次数: 0

Synthesis, Magnetic Properties, and Modeling of Magnetization Reversal of an Artificial Antiferromagnet Based on L10-PdFe 基于 L10-PdFe 的人工反铁磁体的合成、磁性和磁化反转建模

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707104

M. V. Pasynkov, I. V. Yanilkin, A. I. Gumarov, A. V. Petrov, L. R. Tagirov, R. V. Yusupov

Abstract

The static magnetic properties were experimentally studied and magnetization reversal was modeled in an epitaxial thin film of the L1₀ phase of the PdFe compound and the PdFe/W/PdFe heterostructure on MgO (001) substrates. It was shown that the PdFe/W/PdFe heteroepitaxial structure at an α-W layer thickness of ∼0.7 nm is an artificial antiferromagnet with perpendicular magnetic anisotropy and an exchange integral of (J simeq 1.7 times {{10}^{{ - 3}}},,{text{J/}}{{{text{m}}}^{2}}). Micromagnetic modeling of the equilibrium domain structure and its evolution in an external magnetic field made it possible to satisfactorily describe the magnetization reversal curve of the studied thin-film heterostructure.

摘要对氧化镁（001）基底上的钯铁化合物 L10 相外延薄膜和钯铁/W/钯铁异质结构的静磁特性进行了实验研究，并建立了磁化反转模型。研究表明，α-W层厚度为0.7 nm的PdFe/W/PdFe异质外延结构是一种具有垂直磁各向异性的人工反铁磁体，其交换积分为(J simeq 1.7 times {{10}^{{ - 3}}},{text{J/}}{{{text{m}}}^{2}})。对平衡畴结构及其在外加磁场中的演变进行微磁建模，可以令人满意地描述所研究的薄膜异质结构的磁化反转曲线。

引用次数: 0

Comparative Study of the Structure and Electromagnetic Characteristics of Manganites Doped with Cation Pairs (Fe,Zn), (Fe,Co), and (Fe,Mg) 掺杂阳离子对（Fe,Zn）、（Fe,Co）和（Fe,Mg）的锰矿的结构和电磁特性比较研究

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s106287382470727x

A. G. Badelin, V. K. Karpasyuk, S. Kh. Estemirova

Abstract

The influence of the configuration of ions (Zn²⁺(3d¹⁰), Co²⁺(3d⁷), Co³⁺(3d⁶), Mg²⁺(2p⁶)) replacing manganese in La–Sr manganites on crystal lattice parameters, magnetization, Curie point, semiconductor-metal transition and magnetoresistance has been established. The composition with cobalt in the state of Co³⁺(3d⁶) has the highest values of magnetic parameters, and Mg-containing manganite has the lowest values, but it exhibits the maximum magnitude of magnetoresistance.

摘要确定了 La-Sr 锰矿中替代锰的离子（Zn2+(3d10)、Co2+(3d7)、Co3+(3d6)、Mg2+(2p6)）构型对晶格参数、磁化率、居里点、半导体-金属转变和磁阻的影响。Co3+(3d6)状态的钴成分具有最高的磁性参数值，而含镁锰矿的磁性参数值最低，但磁阻最大。

引用次数: 0

Spectral Luminescent Properties of Alkaline Earth Fluoride Crystals Implanted with Silver Ions 植入银离子的碱土氟化物晶体的光谱发光特性

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707062

V. L. Paperny, A. A. Chernykh, A. S. Ishchenko, S. V. Murzin, A. S. Myasnikova, R. Yu. Shendrik, E. F. Martynovich, V. P. Dresvyanskiy

Abstract

Spectral and kinetic characteristics of photoluminescence of BaF₂ and SrF₂ crystals implanted with high-energy (∼100 keV) Ag ions were studied. The photoluminescence spectra of both crystals have a similar structure, in which three components are observed with maxima in the wavelength ranges 500–550, 600–670, and 760–770 nm. The positions of the maxima depend on the material of the matrix and the excitation wavelength. The kinetic curves of luminescence decay also exhibit three components with characteristic decay times of ≤1, about 4, and 13–15 ns.

摘要研究了植入高能量（∼100 keV）Ag 离子的 BaF2 和 SrF2 晶体的光致发光光谱和动力学特征。这两种晶体的光致发光光谱具有相似的结构，其中在波长 500-550、600-670 和 760-770 纳米范围内观察到三个最大分量。最大值的位置取决于基体材料和激发波长。发光衰减的动力学曲线也显示出三个分量，其特征衰减时间分别为 ≤1、约 4 和 13-15 ns。

引用次数: 0

Comparison of the Nuclear Spin Relaxation in Magnetic Cu(II) and Nonmagnetic Ni(II)-(bis)oxamato Complexes 磁性 Cu(II) 和非磁性 Ni(II)-(双)草氨酸配合物的核自旋弛豫比较

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707128

Yu. V. Slesareva, E. L. Vavilova, Yu. E. Kandrashkin, R. B. Zaripov

Abstract

The electronic system of molecular-based magnets is promising for use in quantum computing devices. Magnetic resonance techniques are used for magnetization manipulation and coherence tracking. The complexes [n-Bu₄N]₂[Cu(opba)] and [n-Bu₄N]₂[Ni(opba)] have been studied by ¹H NMR technique using different pulse protocols. It is shown that the interpulse delay shift and phase cycling approaches are applicable in ¹H NMR, but it’s not as efficient as they are in EPR. Since many nuclei positions completely suppress the unwanted echo contribution, the subensembles including the longitudinal magnetization evolution should be considered.

摘要分子磁体的电子系统有望用于量子计算设备。磁共振技术可用于磁化操纵和相干跟踪。采用不同的脉冲方案，利用 1H NMR 技术研究了[n-Bu4N]2[Cu(opba)]和[n-Bu4N]2[Ni(opba)]复合物。结果表明，脉冲间延迟移动和相位循环方法适用于 1H NMR，但其效率不如 EPR。由于许多核位置完全抑制了不需要的回波贡献，因此应考虑包括纵向磁化演化在内的子总体。

引用次数: 0

Modification of the Implanted Silicon Surface by a Powerful Light Pulse 用强光脉冲改变植入硅表面

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707189

B. F. Farrakhov, Ya. V. Fattakhov, A. L. Stepanov

Abstract

A study was made of the possibility of modifying the near-surface silicon layer before and after ion implantation, followed by pulsed light annealing, to structure the surface of the substrates to increase the efficiency of their use in solar energy. The results were compared with the data obtained on monocrystalline and implanted germanium.

摘要研究了在离子注入前后对近表面硅层进行改性的可能性，然后进行脉冲光退火，以对衬底表面进行结构化处理，从而提高其在太阳能领域的使用效率。研究结果与在单晶硅和植入锗上获得的数据进行了比较。

引用次数: 0

Synthesis and Magnetic Properties of Fe1.1Ga0.9O3, Measured According to Electron Spin Resonance 利用电子自旋共振测量 Fe1.1Ga0.9O3 的合成和磁性能

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707220

I. V. Yatsyk, R. M. Eremina, E. M. Moshkina, R. G. Batulin, A. V. Shestakov

Abstract

The authors study the formation of crystals of Fe-Ga oxides and Fe–Ga–Cu borates in a multicomponent flux system based on Bi₂Mo₃O₁₂–Na₂B₄O₇. The Curie–Weiss temperature (θ_CW = 289 K) and the temperature of the ferrimagnet–paramagnet phase transition (T_C = 288 K) are determined from the electron spin resonance (ESR) spectrum and the magnetization of an Fe_1.1Ga_0.9O₃ single crystal, depending on temperature. Lines of spin-wave resonance are observed in the spectrum of magnetic resonance in the ordered phase.

摘要作者研究了在基于 Bi2Mo3O12-Na2B4O7 的多组分通量体系中铁-镓氧化物和铁-镓-铜硼酸盐晶体的形成。根据电子自旋共振 (ESR) 光谱和 Fe1.1Ga0.9O3 单晶体的磁化率（取决于温度），确定了居里-魏斯温度（θCW = 289 K）和铁磁体-准磁体相变温度（TC = 288 K）。在有序相的磁共振谱中可以观察到自旋波共振线。

引用次数: 0

Kinetics and Quantum Trajectories of Luminescence Intensity of Single Color Centers in Sodium Fluoride Crystals 氟化钠晶体中单色中心发光强度的动力学和量子轨迹

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707049

E. A. Protasova, A. L. Rakevich, E. F. Martynovich

Abstract

Single color centers in sodium fluoride crystals were studied for the first time. The quantum trajectories of the intensity of three types of luminescence centers emitting in the visible region of the spectrum were observed, one of which is the ({text{F}}_{3}^{ + }) center. The quantum trajectories were determined to be flickering. Their flickering is caused by transitions of the centers from the excited singlet state to the triplet state and, further, to the ground singlet state. The average lifetime of the ground triplet state of ({text{F}}_{3}^{ + }) centers as measured from the quantum trajectories of luminescence of single centers is 1.9 s, which coincides with the results of past measurements of the decay kinetics of triplet luminescence of an ensemble of ({text{F}}_{3}^{ + }) centers.

摘要首次研究了氟化钠晶体中的单色中心。观察了在光谱可见光区发光的三种发光中心强度的量子轨迹，其中一种是 ({text{F}}_{3}^{ + }) 中心。量子轨迹被确定为是闪烁的。它们的闪烁是由中心从激发的单重态跃迁到三重态，再进一步跃迁到地单重态引起的。根据单个中心发光的量子轨迹测得的({{F}}_{3}^{ + }) 中心的地面三重态的平均寿命为 1.9 秒，这与过去对({{F}}_{3}^{ + }) 中心集合的三重态发光衰减动力学的测量结果相吻合。

引用次数: 0

Nonlocal Effects in the Method of Integral Equations of the Theory of Liquids 液体理论积分方程法中的非局部效应

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics

Pub Date : 2024-08-19 DOI: 10.1134/s1062873824707001

Yu. V. Agrafonov, I. S. Petrushin

Abstract

The Ornstein–Zernike integral equations for thermodynamically equilibrium liquids are considered, taking into account irreducible diagrams. An algorithm for calculating the first irreducible diagram is formulated for a spatially homogeneous fluid. For liquids bordering a solid surface, an equation is obtained that implicitly considers all irreducible diagrams.

摘要考虑到不可还原图，研究了热力学平衡液体的 Ornstein-Zernike 积分方程。为空间均质液体制定了计算第一个不可还原图的算法。对于与固体表面接壤的液体，得到了一个隐含考虑所有不可还原图的方程。

引用次数: 0

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