Magnetization Dynamics in Proximity-Coupled Superconductor-Ferromagnet-Superconductor Multilayers:II. Thickness Dependence of the Superconducting Torque

In this work, we study magnetization dynamics in superconductor-ferromagnet-superconductor thin-film structures. Results of the broad-band ferromagnetic resonance spectroscopy are reported for a large set of samples with varied thickness of both superconducting and ferromagnetic layers in a wide frequency, field, and temperature ranges. Experimentally the one-dimensional anisotropic action of superconducting torque on magnetization dynamics is established; its dependence on thickness of layers is revealed. It is demonstrated that experimental findings support the recently proposed mechanism of the superconducting torque formation via the interplay between the superconducting imaginary conductance and magnetization precession at superconductor-ferromagnet interfaces. Microwave spectroscopy studies in this work are supplemented by investigations of the crystal structure and the microstructure of studied multilayers.</p

Interplay of magnetization dynamics with a microwave waveguide at cryogenic temperatures

In this work, magnetization dynamics is studied at low temperatures in a hybrid system that consists of a thin epitaxial magnetic film coupled with a superconducting planar microwave waveguide. The resonance spectrum was observed over a wide magnetic field range, including low fields below the saturation magnetization and both polarities. Analysis of the spectrum via a fitting routine we develop allows the derivation of all magnetic parameters of the film at cryogenic temperatures, the detection of waveguide-induced uniaxial magnetic anisotropies of the first and the second order, and the uncovering of a minor misalignment of the magnetic field. A substantial influence of the superconducting critical state on the resonance spectrum is observed and discussed

Measurement of (anti)deuteron and (anti)proton production in DIS at HERA

The first observation of (anti)deuterons in deep inelastic scattering at HERA has been made with the ZEUS detector at a centre-of-mass energy of 300--318 GeV using an integrated luminosity of 120 pb-1. The measurement was performed in the central rapidity region for transverse momentum per unit of mass in the range 0.3<p_T/M<0.7. The particle rates have been extracted and interpreted in terms of the coalescence model. The (anti)deuteron production yield is smaller than the (anti)proton yield by approximately three orders of magnitude, consistent with the world measurements.Comment: 26 pages, 9 figures, 5 tables, submitted to Nucl. Phys.

Nonlinear spin waves in ferromagnetic/superconductor hybrids

© 2020 Author(s). This work is focused on the numerical investigation of spin waves that propagate in nonlinear ferromagnet/superconductor bilayered films and periodic structures. The nonlinearity in these hybrid structures emerges due to the non-monotonous dependence of magnetization of a superconducting subsystem on the magnetic field, which is characterized by the superconducting critical field. It is shown that at relatively high amplitudes of spin waves in comparison to the superconducting critical field, the spin-wave spectrum changes drastically: the spin-wave spectral line can either bifurcate or stretch continuously depending on the type of considered superconductor. In addition, in the case of propagation of spin waves with relatively high amplitude in periodic magnonic metamaterials, additional zero-group-velocity modes appear that are known as flatbands. Overall, these findings suggest a versatile way for tunability of the spin-wave spectrum in nonlinear ferromagnet/superconductor structures by changing the excitation signal in respect to the superconducting critical field

Chapter 9: Blind Determination of Noise Type for Spaceborne and Airborne Remote Sensing

International audienc

Ferromagnetic resonance with long Josephson junction

In this work we propose a hybrid device based on a long Josephson junction (JJ) coupled inductively to an external ferromagnetic (FM) layer. The long JJ in a zero-field operation mode induces a localized AC magnetic field in the FM layer and enables a synchronized magnetostatic standing wave. The magnetostatic wave induces additional dissipation for soliton propagation in the junction and also enables a phase locking (resonant soliton synchronization) at a frequency of natural ferromagnetic resonance. The later manifests itself as an additional constant voltage step on the current-voltage characteristics at the corresponding voltage. The proposed device allows to study magnetization dynamics of individual micro-scaled FM samples using just DC technique, and also it provides additional phase locking frequency in the junction, determined exclusively by characteristics of the ferromagnet

Инструментальные средства анализа депрессивного состояния и личностных черт человека

The analysis of works dedicated to the identification of a stable relationship between personality traits and a person's depression is carried out according to a complex of information available in social networks. The importance of automated problem solving follows from the need to timely detect signs of depression as a widespread mental illness to take measures for its prevention and treatment in the early stages.The article discusses the issues of building mechanisms for identifying patterns and building modern tools for analyzing social network data for conducting scientific research in the subject area. As tools for identifying depression, it is proposed to apply contemporary methods of automatic analysis of web pages, formalize the identification of destructive information on psychologists' proposals, test hypotheses about the presence of correlation links, automatically classify text-graphic information using an artificial neural network device in combination with semantic and psychological methods data analysis. Based on the studies performed, we found a significant correlation between various gradations of depression and some personality traits, as well as the presence of a stable correlation between the personality traits of the Big Five. (In Russian).Выполнен анализ работ, посвященных выявлению устойчивой связи между личностными чертами и депрессией человека по комплексу информации, доступной в социальных сетях. Значимость автоматизированного решения задачи определяется необходимостью своевременного выявления признаков депрессии как широко распространенного психического заболевания для принятия мер ее профилактики и лечения на ранних стадиях.Рассмотрены вопросы построения механизмов выявления закономерностей и построения современных инструментальные средств анализа данных социальных сетей для проведения научных исследований в предметной области. В качестве инструментальных средств выявления депрессии предлагается применять современные методы автоматического анализа веб-страниц, формализации выявления деструктивной информации по предложениям психологов, проверки гипотез о наличии корреляционных связей, автоматической классификации текстово-графической информации с помощью аппарата искусственных нейронных сетей в сочетании с методами семантического и психологического анализа данных.Эксперименты выявляют существенную корреляционную связь между различными градациями депрессии и некоторыми личностными чертами, а также устойчивую корреляцию между самими личностными чертами большой пятерки