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Samardak, Alexander S.,Davydenko, Alexander V.,Ognev, Alexey V.,Jeon, Yoo Sang,Choi, Young Soo,Kim, Young Keun IOP Publishing 2016 Japanese journal of applied physics Vol.55 No.10
<P>Understanding the ferromagnetic behavior of coupled magnetic nanoparticles (NPs) in a chain structure, called a 'nanochain (NC)', will open up new routes for its practical use. Here, we report the magnetization reversal modes in isolated magnetite (Fe3O4) NPs with diameters of 100 and 200 nm, as well as those of one-dimensional (1D) self-assembled NCs consisting of these NPs. NCs consisting of 100-nm diameter NPs switched through a transverse domain wall-like motion. Meanwhile, in 200-nm diameter NPs and NCs, we observed 3D magnetic vortex states that were more energetically favorable than single domain or multidomain states. (C) 2016 The Japan Society of Applied Physics</P>
Analysis and Priorities of State Regulation of the Labor Market in Crisis Conditions
Yurii Shpak,Vitaliy Davydenko,Vаsyl Pasichnyk,Valentyna Zhukovska,Viktoriya Ivanyuta International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.12
The main purpose of the study is to analyze the features of state regulation of the labor market in a crisis. Structural shifts in the labor market are due to the transformation of public and economic relations in today's globalized world. Increasing competition, the development of the knowledge economy, information technology, changes in the content and forms of labor require updating the labor market regulation system. The research methodology implies the use of modern methods of analysis. The analysis of the features of state regulation of the labor market in crisis conditions is carried out.
Magnetization reversal of ferromagnetic nanosprings affected by helical shape
Nam, Da Yeon,Samardak, Aleksei Yu.,Jeon, Yoo Sang,Kim, Su Hyo,Davydenko, Alexander V.,Ognev, Alexey V.,Samardak, Alexander S.,Kim, Young Keun The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.43
<P>Helicity, a natural property of macro-, micro-, and nano-objects, potentially offers a new dimension to mechanical and electromagnetic applications for creating emerging nanodevices, such as nanorobots, nanomagnets, nanosensors, and high-density magnetic memory. Helical magnetic nanosprings are unique objects with remarkable magnetic properties, including the absence of stray fields in remanence owing to the chiral geometry, which makes them promising for data storage devices, nanoelectromechanical systems, and biomedical usage. Here, we investigated Co and CoFe nanospring arrays electrodeposited in highly ordered nanoporous templates. We report helical-shape-driven magnetization reversal of the nanosprings in comparison with the behavior of dipolarly coupled nanowires. We reveal two magnetization reversal modes depending on the orientation of the external magnetic field: coherent rotation of magnetization in the longitudinal geometry and three-dimensional vortex domain wall motion in the transverse geometry. The experimental findings are supported by analytical calculations and micromagnetic simulations that help to explain the field-dependent spin configurations observed by magnetic force microscopy.</P>
Magnetic Properties of Epitaxial [Pd/Co/CoO]n Superlattices
A. G. Kozlov,A. F. Shishelov,A. A. Turpak,M. A. Kuznetsova,A. V. Prikhodchenko,A. V. Davydenko,E. V. Tarasov,N. N. Chernousov,A. V. Ognev,A. S. Samardak 한국자기학회 2024 Journal of Magnetics Vol.29 No.1
Here, the investigation of the structural features, magnetic properties, and domain structure of multilayer superlattices prepared by molecular beam epitaxy and partial oxidation of magnetic layers is presented. The influence of the number of repetitions on the morphology of the interfaces is investigated. It is also shown that the epitaxial growth of the Pd and Cu layers is retained when growing over oxide layers. The paper presents the dependences of the coercive force and magnetic anisotropy energy and explains their behavior. The domain structure is studied by the magnetooptical Kerr effect and magnetic force microscopy. The possibilities of modifying the domain structure into skyrmion lattices by local action with a magnetic probe and without an external magnetic field are demonstrated.