• Journal of Magnetics
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• v.10 no.2
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• pp.66-70
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• 2005

The junction properties between the ferromagnet (FM) and two-dimensional electron gas (2DEG) system are crucial to develop spin electronic devices. Two types of 2DEG layer, InAs and GaAs channel heterostructures, are fabricated to compare the junction properties of the two systems. InAs-based 2DEG layer with low trans-mission barrier contacts FM and shows ohmic behavior. GaAs-based 2DEG layer with $Al_2O_3$ tunneling layer is also prepared. During heat treatment at the furnace, arsenic gas was evaporated and top AlAs layer was converted to aluminum oxide layer. This new method of forming spin injection barrier on 2DEG system is very efficient to obtain tunneling behavior. In the potentiometric measurement, spin-orbit coupling of 2DEG layer is observed in the interface between FM and InAs channel 2DEG layers, which proves the efficient junction property of spin injection barrier.

• Proceedings of the Korean Magnestics Society Conference
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• 2004.12a
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• pp.34-35
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• 2004

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.665-666
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• 2006

• Proceedings of the Korean Magnestics Society Conference
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• 2010.06a
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• pp.124-125
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• 2010

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.937-939
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• 2007

Carbon nanotubes (CNTs) have used as an electron field emitter of the field emission display (FED) due to their characteristics of high-electron emission, rapid response and low power consumption. However, to commercialize the FED with CNT emitter, some fundamental problems regarding life time and emission efficiency have to be solved. In this study, we investigated the $TiO_2$ coated CNT as a field emitter. $TiO_2$ nanoparticles can coated on CNT surface by chemical solution method. $TiO_2$ nanoparticles had uniform size with the average size of about 2.4 nm to 3.1 nm. Field emission performance of CNT coated with $TiO_2$ nanoparticles was evaluated and discussed.

• Proceedings of the Korean Magnestics Society Conference
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• 2005.12a
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• pp.192-193
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• 2005

• Proceedings of the Korean Magnestics Society Conference
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• 2005.12a
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• pp.126-127
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• 2005

• Journal of Magnetics
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• v.12 no.1
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• pp.12-16
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• 2007

Magnetic excitation and reversal by a spin polarized current via spin transfer have been a central research topic in spintronics due to its application potential. Special techniques are required to fabricate nano-scale magnetic layers in which the effect can be observed and studied. This work discusses the possibility of using electron-beam resists, the nano-scale patterning media, as ion milling mask in a subtractive fabrication method. The possibility is demonstrated by two resists, one positive tone, the ZEP 520A, and one negative tone, the ma-N2403. The advantage and the key points for success of this process will be also addressed.

• Proceedings of the KIEE Conference
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• 2003.10a
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• pp.273-275
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• 2003

본 실험은 고출력 반도체 레이저의 p-side-down 마운팅용 솔더로서 AuSn 합금 솔더(80wt%:20wt%)의 적합성에 대해 연구하였다. $1{\mu}m$이하의 균일도로 폴리싱 된 Cu heat sink의 표면에 두께 $1{\mu}m$의 Ni로 코팅을 한다음, AuSn 다층박막은 e-beam 증착기로 AuSn 합금 솔더는 열증착기로 각각 증착하였다. 열처리는 산화 방지를 위해 $N_2$ 분위기에서 행하였으며, 동일한 압력으로 마운팅을 하였다. 표면의 거칠기와 형상은 AFM(Atomic Force Microscope)과 SEM(Scanning Electron Microscopy)으로 그리고 Au와 Sn의 성분비는 AES(Auger Electron Spectroscopy) 로 비교하였다. 또한 CW(연속발진)을 통한 L-I(Light-Current)측정을 통해 본딩상태를 비교하였다.

• Macromolecular Research
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• v.15 no.3
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• pp.216-220
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• 2007

A new polyfluorene-based copolymer having 2-ethylhexyloxy-5-methoxy-l,4-phenylene as an electron donating group and 2,5-diphenyl-oxadiazole as an electron withdrawing group was synthesized by the Suzuki coupling reaction. The obtained copolymer was characterized by $^1H-NMR,\;^{13}C-NMR$, and IR-spectroscopy. The weight average molecular weight ($M_w$) of the obtained polymer was 18,600 with a polydispersity index of 1.5. The maximum photoluminescence of the solution and film of the polymer was observed at 453 nm and 456 nm, respectively. A double-layer device with the configuration, ITO/PEDOT/copolymer/Al, emitted blue light at 460 nm.