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8 results on '"Jin Eun Heo"'

3. Experimental Verification of Ir 5d Orbital States and Atomic Structures in Highly Active Amorphous Iridium Oxide Catalysts

Author

Gihan Kwon, Kevin A. Beyer, Gongfang Hu, Lisa M. Utschig, Jin Eun Heo, Chanseok Kim, Gary W. Brudvig, Hui Zhong, Xiaojing Huang, Jungho Kim, David M. Tiede, Byeong-Gwan Cho, Bumjoon Kim, Tae Yeong Koo, Sooyeon Hwang, Seo Hyoung Chang, Jin-Kwang Kim, Kyeong Jun Lee, Robert J. Koch, Jun Hee Lee, and Seong-Min Bak

Subjects
Materials science, Inorganic chemistry, General Chemistry, Iridium oxide, Catalysis, Amorphous solid
Published
2021
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4. Modulating Curie Temperature and Magnetic Anisotropy in Nanoscale-Layered Cr2Te3 Films: Implications for Room-Temperature Spintronics

Author

Jong Hoon Lee, Young Jun Chang, Seong Won Cho, Hyuk Kim, Chanki Lee, Bheema Lingam Chittari, Hu Young Jeong, Kyeong Jun Lee, Seung-Young Park, Seo Hyoung Chang, Jeil Jung, Beom Hyun Kim, Min Jay Kim, Fengping Li, Younghun Jo, Byoung Ki Choi, Jun Woo Choi, Suyoun Lee, Jin Eun Heo, Younghak Kim, and In Hak Lee

Subjects
Magnetic anisotropy, Materials science, Spintronics, Condensed matter physics, Ferromagnetism, Magnetism, Fundamental physics, Curie temperature, Condensed Matter::Strongly Correlated Electrons, General Materials Science, Spin (physics), Nanoscopic scale
Abstract

Nanoscale-layered ferromagnets have demonstrated fascinating two-dimensional magnetism down to atomic layers, providing a peculiar playground of spin orders for investigating fundamental physics an...

Published
2021
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5. Structural and Optical Properties of Epitaxial Iron Oxide Thin Films Deposited by Pulsed Laser Deposition

Author

Jin Eun Heo, Jae-Won Jang, Taeyang Choi, Jung Hyeon Jeong, Byung Chun Choi, and Seo Hyoung Chang

Subjects
010302 applied physics, Materials science, Band gap, Iron oxide, Analytical chemistry, General Physics and Astronomy, 02 engineering and technology, Hematite, 021001 nanoscience & nanotechnology, Epitaxy, 01 natural sciences, Pulsed laser deposition, chemistry.chemical_compound, chemistry, visual_art, Phase (matter), 0103 physical sciences, visual_art.visual_art_medium, Thin film, 0210 nano-technology, Magnetite
Abstract

Iron oxides have been intensively studied owing to potential applications related to energy conversion and storage systems. In this paper, we investigated crystal structures and optical properties of iron oxide thin films deposited at various oxygen partial pressures and temperatures using pulsed laser deposition. The iron oxide thin films were epitaxially grown on Al2O3 (0001) substrates confirmed by X-ray diffraction measurements. With increasing the growth temperature from 450 K to 800 K, the films exhibited better crystalline hematite phase, alpha-Fe2O3. When the pressure was decreased to 0.5 mTorr, the magnetite phase, Fe3O4, was formed. We found that the optical band gaps of iron oxides mainly originated from O 2p to Fe 3d could be modulated from 2.18 eV to 2.42 eV, applicable for energy conversion systems.

Published
2020
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