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Controlling the Magnetic Properties of the Van der Waals Ferromagnet Fe₃GeTe₂
Hyejin Ryu,Se Young Park,Dong Seob Kim,Yu Liu,Jinwoong Hwang,Younghak Kim,Wondong Kim,Jae-Young Kim,Cedomir Petrovic,Choongyu Hwang,Sung-Kwan Mo,Hyung-jun Kim,Byoung-Chul Min,Hyun Cheol Koo,Joonyeon C 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Identifying material parameters that affect magnetic properties of ferromagnets is key to optimize materials better suited for spintronics applications. Here, we propose an effective hole doping method to modulate the magnetic anisotropy of a van der Waals ferromagnet, and explore the physical origin of this effect. Experimental measurements of the doping and thickness dependent magnetic properties of thin Fe<sub>3-x</sub>GeTe<sub>2</sub> show a significant suppression of the magnetic anisotropy with hole doping. From the measured and calculated doping dependent electronic structure, we find that the energy gain by the spin-orbit induced band splitting is reduced by the chemical potential shift associated with hole doping, which in turn reduce the magnetic anisotropy energy. The identified mechanism provides an understanding of the doping induced modulation of magnetic properties in Fe<sub>3</sub>GeTe<sub>2</sub> thin films.
AHN, Mi-Jeong,YOON, Kee-Dong,MIN, So-Young,LEE, Ji Suk,KIM, Jeong Ha,KIM, Tae Gyun,KIM, Seung Hee,KIM, Nam-Gil,HUH, Hoon,KIM, Jinwoong WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2004 東西醫學硏究所 論文集 Vol.2004 No.-
The bioassay-directed isolation of a marine brown alga, Ecklonia cava, afforded four phlorotannin derivatives, eckol (1), 8,8'-bieckol (2), 8,4'''-dieckol (3), and phlorofucofuroeckol A (4). Among these compounds, 2 and 3 exhibited an inhibitory effect an human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) and protease. Specifically, they inhibited the RT more potently than the protease. The inhibitory activity of compound 2 (IC_(50), 0.51 μм) against HIV-1 RT was comparable to that of nevirapine (IC_(50), 0.28 μм), a reference compound. An enzyme kinetic assay showed that this compound inhibited the RNA-dependent DNA synthesis activity of HIV-1 RT noncompetitively against dUTP/dTTP with a K_(i) value of 0.78 μM. With respect to the homopolymeric template/primer, (rA)_(n)(dT)_(15), 8,8'-bieckol (2) displayed an uncompetitive type of inhibition (K_(i), 0.23 μм).
Impact of Siberian observations on the optimization of surface CO2 flux
Kim, Jinwoong,Kim, Hyun Mee,Cho, Chun-Ho,Boo, Kyung-On,Jacobson, Andrew R.,Sasakawa, Motoki,Machida, Toshinobu,Arshinov, Mikhail,Fedoseev, Nikolay Copernicus GmbH 2017 Atmospheric Chemistry and Physics Vol.17 No.4
<P>Abstract. To investigate the effect of additional CO2 observations in the Siberia region on the Asian and global surface CO2 flux analyses, two experiments using different observation data sets were performed for 2000-2009. One experiment was conducted using a data set that includes additional observations of Siberian tower measurements (Japan-Russia Siberian Tall Tower Inland Observation Network: JR-STATION), and the other experiment was conducted using a data set without the above additional observations. The results show that the global balance of the sources and sinks of surface CO2 fluxes was maintained for both experiments with and without the additional observations. While the magnitude of the optimized surface CO2 flux uptake and flux uncertainty in Siberia decreased from −1.17 ± 0.93 to −0.77 ± 0.70 Pg C yr−1, the magnitude of the optimized surface CO2 flux uptake in the other regions (e.g., Europe) of the Northern Hemisphere (NH) land increased for the experiment with the additional observations, which affect the longitudinal distribution of the total NH sinks. This change was mostly caused by changes in the magnitudes of surface CO2 flux in June and July. The observation impact measured by uncertainty reduction and self-sensitivity tests shows that additional observations provide useful information on the estimated surface CO2 flux. The average uncertainty reduction of the conifer forest of Eurasian boreal (EB) is 29.1 % and the average self-sensitivities at the JR-STATION sites are approximately 60 % larger than those at the towers in North America. It is expected that the Siberian observations play an important role in estimating surface CO2 flux in the NH land (e.g., Siberia and Europe) in the future. </P>
Patterned horizontal growth of ZnO nanowires on SiO2 surface
Jinwoong Kim,Huiseong Jeong,박지용 한국물리학회 2013 Current Applied Physics Vol.13 No.2
We report patterned horizontal growth of ZnO nanowires on SiO2 surface for the study of electrical and luminescent characteristics of individual nanowires and for device applications. Patterns of gold catalytic seed islands with barrier layers which suppress vertical growth were employed to facilitate horizontal growth on SiO2 surface. After the growth, ZnO nanowire devices are fabricated by patterning electrodes aligned over the seed islands and their device characteristics are investigated. We could also investigate history of synthesis conditions by obtaining local luminescence characteristics along individual nanowires.