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손광효,Gisela Schütz,Eberhard Goering 한국물리학회 2020 Current Applied Physics Vol.20 No.4
A systematic study of the magnetization reversal behavior in the regular arrangement of L10-FePt based exchange- spring nanomagnets with different thicknesses of the Co soft magnetic layer is presented. The magnetic property of the hard magnet is compared to two tuned exchange-spring magnets: its systems of 20 nm L10-FePt/ 3 nm, and 7 nm Co. In particular, we focus on the switching field distribution. The exchange coupling showed narrower SFD, in spite of the decoupled part switches earlier. The magnetization switching mechanism of exchange- spring nanomagnets patterns has been revealed with a first-order reversal curves technique and the switching field distribution. Further, the microscopic results using magnetic force microscopy show that the spin rotation of the non-interacting part in the thicker soft layered exchange-spring magnet. The part influences the magnetization reversal process. According to the experimental results, exchange coupling strength can be tuned by the thickness of the soft magnetic layer.
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NMR Investigation of Ag Nanoparticles
손광효,장지훈 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.2
<sup>109</sup>Ag nuclear magnetic resonance (NMR) and relaxation measurements have been performed on two powder samples of Ag nanoparticles with average sizes of 20 nm and 80 nm. The measurements have been done in an external field of 9.4 T and in the temperature range 10 K <i>< T <</i> 280 K. The <sup>109</sup>Ag NMR spectra for both samples have close to Lorentzian shapes and turn out to be mixtures of homogeneous and inhomogeneous lines. The linewidth Δ<i>ν</i> at room temperature is 1.3 kHz for both samples and gradually increases with decreasing temperature. Both the Knight shift (<i>K</i>) and the nuclear spin-lattice relaxation rate (1/<i>T<sub>1</sub></i>) are observed to be almost identical to the values reported for the bulk Ag metal, whereby the Korringa ratio <i>R(= K<sup>2</sup>T<sub>1</sub>T/S)</i> is found to be 2.0 for both samples in the investigated temperature range.
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Development of a Pulsed Magnet System
손광효,S. H. KIM,Z. H. JANG,서병진 한국물리학회 2014 새물리 Vol.64 No.6
We report the development of a high-voltage-capacitor-discharge-type pulsed magnet system generating a magnetic field of higher than 30 T. It is composed of a magnet solenoid, a capacitor bank, a high-voltage high-current switching unit, a high-voltage capacitor-charging DC power supply, and a magnet-cooling liquid-nitrogen dewar. The capacitor bank is composed of 10 units of 9 kV 830 μF pulse capacitors. The switching unit is composed of a high-voltage SCR (silicon controlled rectifier) with a surge current capacity of 65 kA and a maximum voltage of 8.5 kV. The maximum output voltage of the high-voltage DC power supply is 10 kV, and the maximum charging current is 0.5 A. From a test with a calibrated induction magnetometer, the maximum field is found to reach ~30 T at a charging voltage of 4 kV. The duration of the pulse is 50 ~ 200 ms, depending on the crowbar's resistance value. The diode circuit can easily be modified to switch between a full-wave mode and a half-wave mode. Results on the training of the magnet is also reported.
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김수환,손광효,오현철,Kim, Suhwan,Son, Kwanghyo,Oh, Hyunchul 한국재료학회 2020 한국재료학회지 Vol.30 No.3
The magnetocaloric effect (MCE), which is the reversible temperature change of magnetic materials due to an applied magnetic field, occurs largely in the vicinity of the magnetic phase transition temperature. This phenomenon can be used to induce magnetic refrigeration, a viable, energy-efficient solid-state cooling technology. Recently, Metal-organic frameworks (MOFs), due to their structural diversity of tunable crystalline pore structure and chemical functionality, have been studied as good candidates for magnetic refrigeration materials in the cryogenic region. In cryogenic cooling applications, MCE using MOF can have great potential, and is even considered comparable to conventional lanthanum alloys and magnetic nanoparticles. Owing to the presence of large internal pores, however, MOF also exhibits the drawback of low magnetic density. To overcome this problem, therefore, recent reports in literature that achieve high magnetic entropy change using a dense structure formation and ligand tuning are introduced.
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