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Magnetic Force Microscopy (MFM) Study of Remagnetization Effects in Patterned Ferromagnetic Nanodots
Joonyeon Chang,A. A. Fraerman,Suk Hee Han,Hi Jung Kim,S. A. Gusev,V. L. Mironov 한국자기학회 2005 Journal of Magnetics Vol.10 No.2
Periodic magnetic nanodot arrays were successfully produced on glass substrates by interference laser lithography and electron beam lithography methods. Magnetic force microscopy (MFM) observation was carried out on fabricated nanodot arrays. MFM tip induced magnetization effects were clearly observed in ferromagnetic elliptical nanodots varying in material and aspect ratio. Fe-Cr dots with a high aspect ratio show reversible switching of the single domain magnetization state. At the same time, Co nanomagnets with a low aspect ratio exhibit tip induced transitions between the single domain and the vortex state of magnetization. The simple nanolithography is potentially an efficient method for fabrication of patterned magnetic arrays.
Nguyen Van Hieu,Nguyen Bich Ha,V. P. Gerdt,O. Chuluunbaatar,A. A. Gusev,Yu. G. Palii,Nguyen Van Hop 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
The Kondo and the Fano resonances in the two-point Green’s function of the single-level quantum dot were found and investigated in many previous works by means of different numerical calculation methods. In this report, we present a derivation of the analytical forms of the resonance terms in the expression of the two-point Green’s function. For that purpose, the system of Dyson equations for the two-point nonequilibrium Green’s functions in the complex-time Keldysh formalism was established to the second order in the tunneling coupling constants with the mean field approximation for the statistical averages of the products of four electron creation and destruction operators. This system of Dyson equations was solved exactly by means of the computer algebra and the analytical expressions for the resonance terms are derived. The conditions for the existence of the Kondo or the Fano resonances were found.
Powerelectonics for Pulsed Power Technology in KERI
Geun-hie Rim,E.P. Pavlov,Hong-Sik Lee,Jong-Soo Kim,Youn-Sik Jin,Ju-Won Baek,S.V. Shenderey,Dong-Wook Yoo,G.I. Gusev,S.A. Nikiforov,Young-Hoon Jung,In-Wha Jeong,Young-Wook Choi,Jong-Hyun Kim 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper reviews the R&D results achieved in Korea<br/> Electrotechnology Research Institute (KERI) in a decade or so. KERI has developed pulsed power technology and its applications mostly based on power electronics. KERI’s R&D activity covers components, military systems, and industry applications.<br/> <br/> High voltage switching means developed in KERI are a rotary arc gap switch (11kV, 400kAp), a vacuum rotary arc gap (20kV, 150kAp), an inverse pinch switch (20kV, 150kAp), and 10kV semiconductor switch stacks made of thyristors and IGBTs. The IGBT and thyristor stacks consists of from ten to twelve 1.2kV discrete devices and<br/> are operated by only one active circuit located in the ground side. Some ferromagnetic opening switch schemes are also researched on trial bases. <br/> <br/> KERI has developed several pulsed power supplies responding to industry needs, of which applications are electrostatic precipitators, high voltage capacitor chargers, polluted gas treatment systems. The investigated pulsed power applications are rock fragmentation system, plasma ion implantation (PSII), food process, and fine metal powder fabrication system using wire-exploding process.