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여러 하지층을 첨가한 Hexagonal Barium - Ferrite(BaM) 박막의 미세구조와 자기적 특성
김동현(Dong-Hyoun Kim),남인탁(In-Tak Nam),홍양기(Yang-Ki Hong) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.3
In this paper, we studied structural and magnetic properties of Ba-ferrite thin film deposited on Si(100) substrate with various underlayers. Ba-ferrite thin films with various underlayers were deposited by reactive RF/DC magnetron sputtering system at room temperature. various underlayers was reactive sputtered with O₂. After deposition, the thin films were annealed at 850℃ to get the crystallized sample. Underlayers were used to prevent interdiffusion from Ba-ferrite thin film to substrate. The growth of Ba-ferrite thin films was influenced by underlayers. Easy magnetization direction is in-plane. From these results the Ba-ferrite film with various underlayers can be used as longitudinal recording media.
Hexagonal Barium - Ferrite(BaM) 박막의 미세구조와 자기적 특성에 미치는 TiO₂ 하지층의 효과
김동현(Dong-Hyoun Kim),남인탁(In-Tak Nam),홍양기(Yang-Ki Hong) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.3
In this paper, we studied structural and magnetic properties of Ba-ferrite thin film deposited on Si(100) substrate with TiO₂ underlayer. Ba-ferrite thin films with TiO₂ underlayer were deposited by reactive RF/DC magnetron sputtering system at room temperature. TiO₂ underlayer was reactive sputtered with O₂. After deposition, the thin films were annealed at vatious temperatures to get the crystallized sample. Underlayer was used to prevent interdiffusion from Ba-ferrite thin film to substrate. The growth of Ba-ferrite thin films was influenced by TiO₂ underlayer. Easy magnetization direction is in-plane. From these results the Ba-ferrite film with TiO₂ underlayer can be used as longitudinal recording media.
Sputter-texttured Mo 박막이 CoCrTa/Cr 자기기록매체의 자기적 성질에 미치는 영향
조성묵(Jo Sung Mook),남인탁(Nam In Tak) 강원대학교 산업기술연구소 2001 産業技術硏究 Vol.21 No.1
The effect of Mo underlayer on the magnetic properties of CoCrTa/Cr films deposited on glass substrates were investigated. The coercivity increased and the coercivity squareness decreased by introducing Mo underlayer. The coercivity increase was attributed to the increase of in-plane c-axis orientation and magnetic isolation of Co grains deposited on Cr/Mo underlayer. The decrease of coercivity squarenesses seemed to be caused by the increase of magnetic isolation. The increase of magnetic isolation of Co grains was attributed to the diffusion of Mo atoms into grain boundaries of Co films and the physical isolation of Co grains. The coercivity of CoCrTa/Cr/Mo showed maximum values at Mo thickness of 400Å. The appearance of the maximum coercivity at that thickness was attributed to the development of strong Co(1010) and Co(1011) preferred orientation.
남인탁(In-Tak Nam),홍양기(Yang Ki Hong) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
The general requirements of recording media include recording performance, environmental stability, runnability on the drive or deck, and manufacturability. CoCrMo thin films were prepared using RF sputtering system for a study on chemical stability. Surface degradation of the CoCrMo thin film was studied by SEM, XPS and AES. Surface degradation was found to be dependent of sputtering condition and Mo content. Addition of Mo to CoCr thin film improved dramatically its surface degradation resistance in dilute sulfuric acid, as indicated by active-passive transition appeared in electrochemical polarization curve. Futhermore, the passive current density was decreased with increasing Mo content. The reduction in a number density of corrosion sites by Mo addition was observed, after accelerated corrosion test. AES survey indicated that corrosion occured on the site with Cr depletion and highly concentrated chloride ions.
Dy₂ Co₇-H System에서 水素의 Desorption에 관한 硏究
In Tak Nam(南寅卓) 강원대학교 산업기술연구소 1981 産業技術硏究 Vol.1 No.-
A Kinetic model of desorption of hydrogen in Dy₂Co₇-H system has been suggested and rate equation of each step of the model has been compared with experimental results. The rest controlling step was hydrogen recombination in metal surface. The activation energy of over-all reaction was about 23kcal/mole.
공침법으로 합성한 바륨 페라이트(BaM)의 형성과 자기적 성질에 미치는 금속이온 몰 비 및 pH와 열처리 조건의 영향
백인승(In Seung Baek),남인탁(In Tak Nam) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.6
M-type barium ferrite (BaFe₁₂O₁?) powders were synthesized through the co-precipitation method. Starting material composition Fe³?: Ba²? mole ratio was fixed as 8 and the relative amount of Fe³? and Ba²? was controlled. Structure and magnetic properties and powder morphology were investigated using XRD, SEM, VSM. Powder showing high coercivity and small magnetization was obtained at pH8 and Fe³?: Ba²? of 12 : 1.5. Small magnetization value was originated from the existence of α-Fe2O3. Single-phase Mtype barium ferrite were obtained regardless of the heat treatment condition and the amount of Fe³? and Ba²? at pH?10. The largest value of magnetization (55.7 emu/g) under investigation were obtained when Fe³?: Ba²? of 13.6 : 1.7 and furnace cooled powder in O₂. Particle size of powder was in the range of 50~200 ㎚.
플라이애시-고로슬래그 기반 지오폴리머 세라믹스의 열적특성
김진호,남인탁,박현,김경남,Kim, Jin-Ho,Nam, In-Tak,Park, Hyun,Kim, Kyung-Nam 한국재료학회 2016 한국재료학회지 Vol.26 No.10
Geopolymers have many advantages over Portland cement, including energy efficiency, reduced greenhouse gas emissions, high strength at early age and improved thermal resistance. Alkali activated geopolymers made from waste materials such as fly ash or blast furnace slag are particularly advantageous because of their environmental sustainability and low cost. However, their durability and functionality remain subjects for further study. Geopolymer materials can be used in various applications such as fire and heat resistant fiber composites, sealants, concretes, ceramics, etc., depending on the chemical composition of the source materials and the activators. In this study, we investigated the thermal properties and microstructure of fly ash and blast furnace slag based geopolymers in order to develop eco-friendly construction materials with excellent energy efficiency, sound insulation properties and good heat resistance. With different curing times, specimens of various compositions were investigated in terms of compressive strength, X-ray diffraction, thermal property and microstructure. In addition, we investigated changes in X-ray diffraction and microstructure for geopolymers exposed to $1,000^{\circ}C$ heat.
E-Beam Evaporator로 제조된 CoCrTa / Cr - Ni 자기기록 매체의 자기적 특성에 미치는 Cr - Ni 하지층의 결정배향효과
조흥재(Hung Jae Cho),남인탁(In Tak Nam) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.4
The magnetic properties change which was induced by addition of small amount of Ni into Cr underlayer in CoCrTa /CrNi thin film deposited by electron beam evaporator was investigated. The additional Ni element was found to be beneficial for incease in the coercivity of the thin film deposited at the room temperature. The origin of coercivity increase was elucidated by crystal orientation and microstructure investigation using XRD and AFM respectively. It was found that the grain size were increased by Ni addition.<br/> The coercivity of the film with CrNi underlayer is lower than that of film with Cr underlayer when prepared with higher substrate temperature. This result may be originated with the increase in grain size. When film was deposited at 280℃ substrate temperature, Cr segregation in grain boundary is found to be the other factor for determining coercivity value.
알루미나 골재 첨가에 따른 플라이애쉬-고로슬래그계 지오폴리머의 열적특성
김진호,남인탁,박현,김경남,Kim, Jin-Ho,Nam, In-Tak,Park, Hyun,Kim, Kyung-Nam 한국결정성장학회 2017 한국결정성장학회지 Vol.27 No.1
In this study, the higher temperature thermal property of the fly ash-blast furnace slag system Geopolymer including alumina aggregate was investigated whether that Geopolymer will be or not useful as thermal-resistant construction materials. Under every mixing conditions, the crack on the surface of hardened body was not observed up to $800^{\circ}C$ and it corresponded with fact that level of changes was not significant before and after heating process. Residual compressive strength is most high when mixing Blast-Furnace Slag ratio is 60 wt% until temperature reaches $800^{\circ}C$. The major hydrates of hardened body of Geopolymer; amorphous halo pattern between $20{\sim}35^{\circ}$ (2theta) and mullite ($3Al_2O_3{\cdot}2SiO_2$) and quartz ($SiO_2$) was found during the experiment. Amorphous halo pattern was a aluminosilicate gel generated by geopolymeric polycondensation and it was found that the halo pattern of aluminosilicate gel was preserved up to $800^{\circ}C$. The patterns of aluminosilicate gel disappeared from $1,000^{\circ}C$ and crystal phases like gehlenite, calcium silicate, calcium aluminum oxide, microcline was observed with the increase of exposure temperature. 본 연구에서는 Alumina 골재를 사용한 fly ash-blast furnace slag계 Geopolymer의 내열성 건축자재로서의 사용 가능성을 검토하기 위하여 고온조건에서의 열적 특성에 대하여 조사하였다. 모든 배합조건에서 Geopolymer 경화체의 표면 크랙은 $800^{\circ}C$까지는 관찰되지 않았으며, 이것은 열처리 전후 강도의 변화가 작은 것과 일치한다. 또한, $800^{\circ}C$까지 고로슬래그의 혼합비율이 60 wt%일 때 잔존압축강도가 가장 우수한 것으로 나타났다. Geopolymer 경화체의 주요 수화 생성물은 $20{\sim}35^{\circ}$(2theta) 범위의 비정질 halo 패턴과 원재료의 mullite($3Al_2O_3{\cdot}2SiO_2$)와 quartz($SiO_2$)가 확인되었다. 비정질 halo 패턴은 Geopolymer 축중합 반응에 의해서 생성된 aluminosilicate gel이며, $800^{\circ}C$까지는 aluminosilicate gel의 halo 패턴이 유지되고 있음을 알 수 있다. $1,000^{\circ}C$에서 aluminosilicate gel의 패턴은 사라지며 열처리온도의 증가와 함께 gehlenite, calcium silicate, calcium aluminum oxide, microcline와 같은 결정상이 관찰되었다.