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Ferromagnetism in defective yttria-stabilized zirconia
Ryu Sangkyun,Cho Daegill,Park Jun Kue,Lee Jae S.,Hong Tae Eun,Byeon Mirang,Jeen Hyoungjeen 한국물리학회 2022 Current Applied Physics Vol.43 No.-
Significant research attention has been devoted to identifying and synthesizing new magnetic materials via doping of non-magnetic materials. The material defects offer an approach to stabilize ferromagnetism in non-magnetic materials such as oxygen-deficient HfO2 and oxygen-deficient ZrO2. In this study, we demonstrated room-temperature ferromagnetism via nitrogen ion implantation on yttria-stabilized zirconia (YSZ) single crystals. The results of structural and chemical analyses indicate the formation of a distinct surface layer through the implantation of nitrogen ions and potential oxygen vacancies. The lattice constant in this surface layer increased by 0.6% compared to the bulk value. Nitrogen ions were observed in this region, and their concentration was estimated to be 2.32 atoms per unit cell. In contrast to the lack of magnetic hysteresis in a YSZ single crystal, ferromagnetic hysteresis was observed in the ion-implanted YSZ crystals, owing to defects—nitrogen ions and oxygen vacancies in the surface layer.
Growth of electronically distinct manganite thin films by modulating cation stoichiometry
Ryu, Sangkyun,Lee, Joonhyuk,Ahn, Eunyoung,Kim, Jiwoong,Herklotz, Andreas,Bae, Jong-Seong,Lee, Ho Nyung,Kim, Younghak,Kim, Jae-Young,Jeon, Tae-Yeol,Cho, Jinhyung,Park, Sungkyun,Jeen, Hyoungjeen American Institute of Physics 2017 APPLIED PHYSICS LETTERS Vol.110 No.26
GdFe<SUB>12</SUB> 박막의 증착온도에 따른 자기적 특성 변화
조대길(Daegill Cho),류상균(Sangkyun Ryu),진형진(Hyoungjeen Jeen) 한국자기학회 2020 韓國磁氣學會誌 Vol.30 No.6
Alloys of rare earth metal and transition metal with ThMn<SUB>12</SUB> structure are expected to have high saturation magnetization and high magnetic anisotropy. Despite its advantages, it has not been commercialized because of its metastability. GdFe<SUB>12</SUB> is a material having ThMn<SUB>12</SUB> structure. Therefore, it is expected to be difficult to stabilize GdFe<SUB>12</SUB> in bulk form. In this study, GdFe<SUB>12</SUB> was fabricated in the form of epitaxial thin films to stabilize the phase. The films were grown epitaxially from 500 ℃ to 200 ℃. From the results of x-ray diffraction and x-ray absorption, it was confirmed that a (330) GdFe<SUB>12</SUB> thin films were grown. The epitaxial GdFe<SUB>12</SUB> thin film had a saturation magnetization (M<SUB>s</SUB>) = 1130 emu/㎤ and coercivity = 712 Oe at a deposition temperature of 400 ℃.
정석찬,조장혁,김상균,류병우,오원식,김정훈,최익성 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1
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Thickness Dependence on the Magnetism in Mo-Capped Epitaxial Fe Films
Hyeonjun Kong,Eun-Young Ahn,Gowoon Kim,Sangkyun Ryu,Sungkyun Park,Hyoungjeen Jeen,Tae-Yeol Jeon,Younghak Kim,Jin Hyung Cho 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.5
When magnetic metal films are oxidized, in many cases, their saturation magnetization values decrease. The importance of high magnetization is well-known because it is directly related to the maximum energy product. Thus, prevention of oxidation in magnetic metal films via capping is important not only for studying the magnetism in magnetic metal films but also for developing new packaging technology for such films. In this research, we successfully grow epitaxial (110) Fe lms on (0001) Al2O3 substrates by using radio-frequency (RF) magnetron sputtering. We capped 10-nm-thick Mo layers on the Fe films to prevent oxidation. By varying the thickness of the films, we systematically observed the changes in both the coercivity and the saturation magnetization. Especially, when the film's thickness was below 8.5 nm, the coercivity of the film started to decrease. We believe the drastic change in the coercivity appeared in the Fe films when the film's thickness approached the critical domain size for a magnetic domain transition.