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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 ℃.
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.