Olga Roshchupkina

ORCID: 0000-0003-0430-0580
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About
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Research Areas
  • ZnO doping and properties
  • Magnetic properties of thin films
  • Solidification and crystal growth phenomena
  • Advanced Electron Microscopy Techniques and Applications
  • Aluminum Alloy Microstructure Properties
  • Crystallography and Radiation Phenomena
  • Ga2O3 and related materials
  • Advanced X-ray Imaging Techniques
  • nanoparticles nucleation surface interactions
  • Electronic and Structural Properties of Oxides
  • Theoretical and Computational Physics
  • X-ray Spectroscopy and Fluorescence Analysis
  • Ion-surface interactions and analysis
  • Consumer Behavior in Brand Consumption and Identification
  • Metallurgy and Material Forming
  • Diverse Topics in Contemporary Research
  • Electron and X-Ray Spectroscopy Techniques
  • Magnetic Properties and Applications
  • GaN-based semiconductor devices and materials
  • Silicon Nanostructures and Photoluminescence
  • Quantum Dots Synthesis And Properties
  • Magnetic and transport properties of perovskites and related materials
  • Advanced Condensed Matter Physics
  • Corporate Identity and Reputation
  • Advanced Text Analysis Techniques

Soongsil University
2023

Helmholtz-Zentrum Dresden-Rossendorf
2009-2015

Polish Academy of Sciences
2015

University of Bremen
2015

University of Wrocław
2015

Charles University
2015

Lomonosov Moscow State University
2007-2008

Moscow State University
2008

In this experimental and theoretical work we focus on the technique of pulsed laser annealing applied to metastable ferromagnetic semiconductor GaMnAs. Analytical heat-flow calculations are used illustrate position time-dependent temperature distribution during whole process. Such will also play an indispensable role for preparation other new diluted semiconductors by ion implantation subsequent annealing. The structural, magnetic, magnetotransport properties GaMnAs have been probed in...

10.1103/physrevb.81.115202 article EN Physical Review B 2010-03-02

The thickness dependent generation of magnetic stripe domains in NiFe films is investigated by in-depth domain and micromagnetic analysis, as well complementary analysis the microstructure x-ray diffraction transmission electron microscopy. A gradient perpendicular anisotropy with film found. Micromagnetic simulations show that results an asymmetric configuration. Columnar grain coarsening texture development are derived from microstructural investigations. variations correspondingly lead to...

10.1063/1.4792517 article EN Journal of Applied Physics 2013-02-15

In the current study, we explore how women decide whether to accept or reject a potential match offered by dating app (Tinder). Specifically, were trying identify overlying factors that influence decision and understand make judgment based on limited cues provided Tinder profile. Women largely base their perceived attractiveness character of match. The findings suggest is highly subjective, with no universal rules can be quantified; thus, it hard predict acceptance There are however...

10.53728/2765-6500.1597 article EN cc-by Deleted Journal 2023-02-08

X-ray Absorption Fine Structure (XAFS) techniques, namely, Near Edge (XANES), Extended XAFS (EXAFS), and Anomalous Diffraction (AXRD) were used to investigate the local atomic electronic structure of (Ga, Mn)N magnetic layers with Mn concentrations up 10% grown by Molecular Beam Epitaxy. The XANES AXRD analysis prove incorporation on substitutional GaN lattice sites. EXAFS results indicate good quality under examination, although 0.5 nitride atom vacancies found. Wien2k code was applied...

10.1063/1.4907583 article EN Journal of Applied Physics 2015-02-10

Focused ion beam techniques are one way to modify locally the properties of magnetic thin films. We report on structural investigations 50 nm thick non-ordered nano-crystalline Permalloy (Ni81Fe19) films modified by 30 keV Ga+ focused (FIB) irradiation. From x-ray diffraction (XRD) measurements a considerable crystallite growth and material texturing towards (111)-direction with linearly increasing lattice constant was observed. In addition, cross-sectional transmission electron microscope...

10.1063/1.4739302 article EN Journal of Applied Physics 2012-08-01

Simple processes for the preparation of semiconductor quantum dot lattices embedded in dielectric amorphous matrices play an important role various nanotechnology applications. Of particular interest are with properties that differ significantly different directions parallel to material surface. Here, a simple method is demonstrated fabrication anisotropic lattice Ge dots Al 2 O 3 matrix by self-assembly process. A specific deposition geometry oblique incidence and adparticles was used...

10.1107/s0021889813008182 article EN Journal of Applied Crystallography 2013-05-03

It is demonstrated that both the nucleation field and irreversible switching of Sm2Co7/Fe exchange spring bilayers decreased by means 10 keV He ion irradiation. The reduction attributed to interfacial mixing irradiation induced softening hard magnetic layer. By lowering energy 0.8 ions do not penetrate layer and, consequently, no observed. However, although still present it large enough create a graded interface decreases. In contrast, conventional annealing under appropriate conditions...

10.1063/1.3068183 article EN Journal of Applied Physics 2009-01-15

Ion irradiation of semiconductors is a well-understood method to tune the carrier concentration in controlled manner. We show that ferromagnetism GaMnAs films, known be hole-mediated, can modified by He ion irradiation. The coercivity increased more than three times. magnetization, Curie temperature and saturation field along out-of-plane hard axis all decrease as fluence increases. electrical structural characterization irradiated layers indicates tailoring magnetism results from...

10.1088/0022-3727/44/4/045001 article EN Journal of Physics D Applied Physics 2011-01-06

The directional solidification of Ga-25wt%In alloys within a Hele-Shaw cell was visualized by X-ray radioscopy. investigations are focused on the impact melt convection dendritic growth. Natural occurs during bottom up because lighter solute is rejected crystallization. Forced produced specific electromagnetic pump. direction forced flow almost horizontal at front. Melt induces various effects grain morphology primarily caused convective transport solute, such as facilitation growth primary...

10.1088/1757-899x/84/1/012080 article EN IOP Conference Series Materials Science and Engineering 2015-06-11

In this paper the affiliation of S D Yao is incorrect. The correct should be: 1 State Key Laboratory Nuclear Physics and Technology, Peking University, Beijing 100871, People's Republic China Also, address for second has changed to: 2 Institut für Ionenstrahlphysik und Materialforschung, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 128, 01328 Dresden, Germany

10.1088/0022-3727/44/9/099501 article EN Journal of Physics D Applied Physics 2011-02-18

10.1007/s11954-008-2014-3 article EN Bulletin of the Russian Academy of Sciences Physics 2008-04-06

10.3103/s1062873808020147 article EN Bulletin of the Russian Academy of Sciences Physics 2008-02-01

The formation of secondary phases inside yttria stabilized zirconia (YSZ) crystals implanted with Fe ions was investigated by means synchrotron radiation x-ray diffraction, conversion electron Mössbauer spectroscopy, and diffraction reciprocal space mapping. have been into single YSZ(001) at elevated temperatures. As the ion fluence is increased an increase in α-Fe cluster observed, along appearance γ-Fe oxide(s). clusters are proposed to consist a metallic core oxide shell. Ferromagnetic...

10.1063/1.3466753 article EN Journal of Applied Physics 2010-07-15

10.1107/s2053273315097727 article EN Acta Crystallographica Section A Foundations and Advances 2015-08-23

제4차 산업혁명의 가속화와 발전으로 인터넷 사용이 보편화됨에 따라 온라인쇼핑을 이용하는 소비자가 증가하였다. 동시에 서비스 실패로 인한 고객 불만과 부정적인 감정의 축적은 고객의 후속 행동 의도에 영향을 주며 이탈 및 기타 문제를 유발할 수 있다. 이때 실패를 수정하기 위하여 취하는 일련의 행동을 회복 전략이라고 한다. 기업이 실패에 대한 반응으로서 하는데 기존 연구는 고객이 중심이 아닌 기업의 관점에서 출발한 연구가 대부분이다. 이에 본 연구에서는 온라인 전략이 공정성 지각 후행변수인 시민 행동에 어떤 미치는지 확인함과 그 영향 관계에 있어서 참여와 특별 취급의 조절 효과를 살펴보면서 효과적인 개선방안을 제시함으로써 향후 고객들의 욕구를 이해하고 운영 활용에 필요한 실무적 방안을 모색하고자 연구의 목적 달성을 위해 쇼핑몰을 이용하면서 제공자에 대해 불만이나 불편이 있었던 경험이 있는 중국 소비자를 대상으로 연구를 진행하였다. 분석결과에 지각에 정(+)의 미치는 것으로...

10.56352/smj.2023.16.1.02 article KO Journal of Korea Parliamentary Law Institute 2023-06-30

The present study examines the role of script used for graphical representation a brand name in creating meaning. results demonstrate that each contributes to forming different aspects meaning multi-script environments. However, process transfer is also influenced by context product category, which can impact some related norms and familiarity. Furthermore, indicates if aligns with category schema, it positively impacts attitude. This adds branding literature introducing concept as...

10.53728/2765-6500.1609 article EN cc-by Deleted Journal 2023-08-10
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