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고영호,김광주,한충규,Cedomir Petrovic,Rongwei Hu,이현희,이용재 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.3
X-ray diffraction patterns of ε-FeSi have been measured at pressures up to ~53 GPa with good signal-to-noise ratio and high resolution by using synchrotron radiation. In order to refine the crystal structure, a Rietveld analysis has been performed. The structure of ε-FeSi is cubic with space group P213 and a = 4.4781 ± 0.0026 °A. A third-order Birch-Murnaghan equation of state fit to the experimental data yields V0 = 89.80 ± 0.15 °A3, with a B0 of 204.7 ± 4.9 GPa and B'0= 5.6 ± 0.3. The bulk modulus obtained from this study is not only in very good agreement with those of some previous experimental studies but also in good agreement with those obtained from first-principles calculations.
Surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2
김동섭,기정연,이지은,Liu Yu,김영학,김남동,황춘규,김원동,Petrovic Cedomir,이동렬,Jang Chaun,류혜진,최준우 한국물리학회 2021 Current Applied Physics Vol.30 No.-
We investigate the surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2, a material widely utilized for spintronic applications. While known for its relative air-insensitivity, exposure to air during the handling process (e.g. device or heterostructure fabrication) can lead to reduction or disappearance of its magnetic signal. Comparison of x-ray absorption and x-ray magnetic circular dichroism spectra between pristine and air-exposed Fe3-xGeTe2 confirm a naturally oxidized surface layer on the material. The surface oxide layer has predominantly Fe3+ content. X-ray absorption spectroscopy done on micron-sized exfoliated Fe3-xGeTe2 flakes reveal that the change in the surface chemical properties can be quite significant for thin flakes. The surface modulation of Fe3- xGeTe2 can lead to inaccuracies in characterizing its interfacial magnetic and spin transport properties, and complicate device and heterostructure fabrication processes.
Voltage Control of Magnetic Anisotropy in van der Waals Ferromagnetic/Ferroelectric Heterostructures
Jaeun Eom,Inhak Lee,Jung Yun Kee,Minhyun Cho,Yumin Sim,Cedomir Petrovic,Hyejin Ryu,Chaun Jang,Young Duck Kim,Maeng-Je Seong,Jin Hong Lee,Se Young Park,Jun Woo Choi 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.1
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.
Magnetoelectric Effect in van der Waals Ferromagnetic/Ferroelectric Heterostructure Devices
Jaeun Eom,Inhak Lee,Jung Yun Kee,Minhyun Cho,Jeongdae Seo,Hoyoung Suh,Hyung-Jin Choi,Yumin Sim,Shuzhang Chen,Hye Jung Chang,Seung-Hyub Baek,Cedomir Petrovic,Hyejin Ryu,Chaun Jang,Young Duck Kim,Chan-H 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.2