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GMI Effect of Amorphous Microwires with Enhanced Magnetic Softness
A. Zhukov,M. Ipatov,A. Talaat,V. Zhukova,C. Garcia 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We present our results on studies of soft magnetic properties and GMI effect in thin microwires at elevated frequencies paying special attention to tailoring the GMI effect and achievement of high GMI ratio (∆Z/Z), high magnetic field sensitivity (dZ/dH) with low hysteretic behavior. We measured magnetic field dependence of real part, of the longitudinal wire impedance up to frequency, f, 4 GHz in Co-rich microwires. We observed that the GMI magnetic field dependence can be tailored either controlling magnetoelastic anisotropy of as-prepared microwires or by heat treatment.
Central Asia:Development under Conditions of Globalization
Stanislav Zhukov 연세대학교 동서문제연구원 2001 Global economic review Vol.30 No.2
The entire post-Soviet era is exposed to the decisive impact of several powerful processes. These include the construction of new states, the formation of national economies, the transition from a command-mobilization economy to a market-driven one, and globalization which is the most important. It would be no exaggeration to say that, to a significant extent, globalization determines the processes of state-building and market transformation.
EVGENIY GNEZDILOV,ANATOLY ZHUKOV 동북아시아문화학회 2008 동북아시아문화학회 국제학술대회 발표자료집 Vol.- No.-
The demands, presented to the specialists at different levels of organization and management of fuel-and-energy enterprises, trends of deep chemical processing of coal mineral resources, teaching and educational, researching problems of the professional training and specialist's upgrading under restructuring and diversification of regional FEC of the Far East of Russia are considered in the report.
Akshulakov, Serik,Igissinov, Nurbek,Aldiyarova, Nurgul,Akhmetzhanova, Zauresh,Ryskeldiyev, Nurzhan,Auezova, Raushan,Zhukov, Yevgeniy Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.16
This study was conducted to evaluate the one-year survival rate of patients with primary malignant central nervous system (CNS) tumors after surgical treatment in Kazakhstan. Retrospective data of patients undergoing operations in the Department of Central Nervous System Pathology in the JSC National Centre for Neurosurgery in the period from 2009 to 2011 were used as the research material. Kaplan-Meier survival analysis was performed with the following information: gender, date of birth, place of residence, diagnosis according to ICD-10, the date of the operation, the morphological type of tumor, clinical stage, state at the end of the first year of observation, and the date of death. The study was approved by the ethical committee of the JSC National Centre for Neurosurgery. The overall one-year overall survival rate (n=152) was 56.5% (95% confidence interval (CI): 50.2-62.7), and 79.5% (95% CI 72.2-86.8) and 33.1% (95% CI: 21.0-42.3) for Grades I-II (n=76) and Grades III-IV (n=76), respectively. Significant prognostic factors which affected the survival rate were age and higher tumor grade (Grades III-IV), corresponding with results described elsewhere in the world.
GMR Effect in Co-Cu Microwires
V. Zhukova,J. J. del Val,M. Ilyn,M. Ipatov,R. Varga,C. Garcia,A. Zhukov 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We studied magnetic properties and GMR effect of Cox − Cu100−x (10 ≤ x30 at%) microwires. We observed considerable magnetoresistance (MR), ΔR/R, in Co-Cu glass coated microwires withx = 10-30%. For low x content (x = 10), ΔR/R we observed negative MR, tending to saturate inhigh magnetic fields, H. On the other hand, for the samples x = 30 ΔR/R(H) dependences showednon-monotonic behavior, exhibiting R/R increase with H at low H-values (up to 5 kOe) and alsoconsiderable GMR effect. Temperature dependence of magnetization measured in samples cooled without magnetic field(zero field cooling, ZFC) and cooled under magnetic field (field cooled, FC) exhibit significantdifference for Cox Cu100−x (x = 30). For Cox Cu100−x (x = 10) microwires we observed a maximumat quite low temperature, indicating possibility of existence of some amount of small Co-grains. X-ray diffraction (XRD) results reveal that the structure of the metallic core is granular withtwo phases: the main one, fcc Cu (lattice parameter 3.61 °A), found in all samples and fcc -Co(lattice parameter 3.54 °A) which is present in microwires with higher Co content. In the case oflow Co content, XRD indicates that Co atoms are distributed within the Cu crystals. The quantityand the crystallite size of the formed phases strongly depend on the geometry of the microwire.
Manipulation of Domain Wall Dynamics in Microwires by Transverse Magnetic Field
J. M. Blanco,A. Chizhik,V. Zhukova,J. Gonzalez,A. Talaat,V. Rodionova,A. Zhukov 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
In this paper we studied effect of transversal magnetic field, magnetoelastic anisotropy and defects on DW dynamics of amorphous microwires. We observed that the viscous single DW region is limited by the samples defects, which determine the threshold between single and multiple domain wall propagation regimes. Manipulating the magnetoelastic energy through application of tensile stress of studied microwires we significantly affect the DW dynamics in magnetically bistable microwires. Under effect of transversal magnetic field, Hb, we observed change of DW dynamics and we were able to create additional DW on the opposite wire end. Changing the Hb we were able to tailor propagation field of this additional DW and observe DW collision in different parts of microwire.