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정균호,송승곤,박경완,석중현,김경민,박윤선 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.5
We fabricated an Al / AlOx / Al device by using a RF magnetron sputter system. The device showed a unipolar resistive switching process. In this study, the switching mechanism of the device followed the conductive filament model. The conduction mechanisms for the conductive filament model were explained by using Ohmic conduction for the low resistance state (LRS) and Schottky emission for the high resistance state (HRS). The average value of the resistance ratio between the HRS and the LRS was about 3.48 × 107 when the reading voltage (0.1 V) was achieved. The electrical property of the endurance was achieved under 50 switching cycles. A low switching voltage could be obtained for a low power consuming device. These results proved that the AlOx material has various possibilities for use in nonvolatile random access memory applications.
비-휘발성 저항 변화 메모리 응용을 위한 WO<sub>x</sub> 물질의 전기적 특성 연구
정균호,김경민,송승곤,박윤선,박경완,석중현,Jung, Kyun Ho,Kim, Kyong Min,Song, Seung Gon,Park, Yun Sun,Park, Kyoung Wan,Sok, Jung Hyun 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5
In this study, we observed current-voltage characteristics of the MIM (metal-insulator-metal) structure. The $WO_x$ material was used between metal electrodes as the oxide insulator. The structure of the $Al/WO_x/TiN$ shows bipolar resistive switching and the operating direction of the resistive switching is clockwise, which means set at negative voltage and reset at positive voltage. The set process from HRS (high resistance state) to LRS (low resistance state) occurred at -2.6V. The reset process from LRS to HRS occurred at 2.78V. The on/off current ratio was about 10 and resistive switching was performed for 5 cycles in the endurance characteristics. With consecutive switching cycles, the stable $V_{set}$ and $V_{reset}$ were observed. The electrical transport mechanism of the device was based on the migration of oxygen ions and the current-voltage curve is following (Ohm's Law ${\rightarrow}$ Trap-Controlled Space Charge Limited Current ${\rightarrow}$ Ohm's Law) process in the positive voltage region.
자동차용 아연도금강판의 심 용접조건과 용접성에 관한 연구
임재규,정균호,국중하 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.1
This paper is studied about welding conditions and weldability of seam welding for galvanized steel sheet of automotive. The fuel tank of automobile is made by seam welding to be required of airtight or oiltight. This method have required a short time for welding, simplicity operation progress and little HAZ. Especially, it has more less residual stress and transformation than different welding progress. So, this study is for decreasing the leakage occurrence rate and to make standard operating condition table anyone can operate easily. Therefore, this study is analyzed the optimum conditions of seam welding for making the automobile with galvanized steel sheets by means of observing the microstructure and configuration back projection, RT, tensile-shear strengths test and SEM. Optimum conditions of seam welding obtained as follows, current 17.2-17.6kA speed 1.0m/min weld time 4:10:6 and current 16.5-17.4kA, speed 0.83m/min, weld time 4:10:4 at t1.0, and current, 18.5-18.9kA, speed 0.8m/min, weld time 4:10:4 and current 16.5-17.4kA, speed 0.68m/mi, weld time 4:10:2 at t1.6.
비-휘발성 저항 변화 메모리 응용을 위한 WOx 물질의 전기적 특성 연구
석중현,정균호,김경민,송승곤,박윤선,박경완 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5
In this study, we observed current-voltage characteristics of the MIM (metal-insulator-metal) structure. The WOx material was used between metal electrodes as the oxide insulator. The structure of the Al/WOx/TiN shows bipolar resistive switching and the operating direction of the resistive switching is clockwise, which means set at negative voltage and reset at positive voltage. The set process from HRS (high resistance state) to LRS (low resistance state) occurred at . The reset process from LRS to HRS occurred at . The on/off current ratio was about and resistive switching was performed for 5 cycles in the endurance characteristics. With consecutive switching cycles, the stable and were observed. The electrical transport mechanism of the device was based on the migration of oxygen ions and the current-voltage curve is following (Ohm’s Law → Trap-Controlled Space Charge Limited Current → Ohm’s Law) process in the positive voltage region. 본 실험에서, 우리는 MIM(Metal-Insulator-Metal) 구조의 전류-전압 특성들을 관찰하였다. 금속 전극들 사이에 산화 절연체로서 WOx 물질을 사용하였다. Al/WOx/TiN의 구조는 양극성 저항 변화 스위칭을 보여주고 저항 변화 스위칭의 동작 방향은 음의 전압에서 set, 양의 전압에서 reset인 시계 방향이다. 높은 저항 상태에서 낮은 저항 상태로 변하는 set 과정은 –2.6 V에서 일어났다. 낮은 저항 상태에서 높은 저항 상태로 변하는 reset 과정은 2.78 V에서 일어났다. On/Off 전류비는 10이었고, 내구성 특성을 위해 5번 주기의 저항 변화 스위칭을 실행하였다. 연속전인 스위칭 주기에 따라 안정적인 Vset과 Vreset은 관찰되었다. 소자의 전기적인 수송 메커니즘은 산소 이온들의 이동을 기초로 하며 전류 전압 곡선은 양의 전압 영역에서 (옴의 법칙 → 공간 전하 제한 전류 → 옴의 법칙) 과정을 따른다.