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박막 자기 저항 헤드용 자기교환 결합 NiFe / TbCo 박막
오장근(J. G. Oh),조순철(S. C. Jo),안동훈(D. H. Ahn) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.4
Exchange coupled NiFe / TbCo / SiO₂ thin films for magnetoresistive heads were sputter deposited using RF diode sputtering method, and their magnetic characteristics were measured TbCo films were deposited using a composite target, which is composed of Tb chips epoxied on a Co target. NiFe(400 Å) / TbCo(1500 Å) / SiO2(500 Å) films were deposited using a TbCo target having 30 % of Tb area ratio, which showed 25 Oe of the exchange field without substrate bias and 12 Oe with -55 V of substrate bias. The effective in-plane coercivities of the three layer films fabricated with less than -55 V of substrate bias were approximately proportional to the perpendicular coercivities of the TbCo layer only. The films fabricated with a TbCo target of 28 % area ratio showed the same trend. However, the exchange field decreased to 4 Oe without the substrate bias and 7 Oe with -55 V of substrate bias. In the films fabricated with 1000 W of power and the target of 36 % area ratio exhibited 100 Oe of exchange field and 3 Oe of coercivity. As the thickness of NiFe layer increased, the exchange field decreased.
자기 저항 헤드의 이중 자기 교환 바이어스를 위한 NiFe / TbCo / Si₃N₄ 박막제조
김영채(Y. C. Kim),오장근(J. G. Oh),조순철(S. C. Jo) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.3
NiFe /TbCo /Si₃N₄ thin films were fabricated, which can be employed as dual(longitudinal and transverse) biased magnetoresistive elements utilizing surface magnetic exchange at the interface of NiFe /TbCo films. When Tb area percent was 36 % and substrate bias was not applied, magnetic exchange fields of 100 ~ 180 Oe were obtained. The thicknesses of NiFe, TbCo and Si₃N₄(Protective layer) were 470 Å, 2400 Å and 600 Å, respectively. Magnetoresistance ratio of 1.45 % was obtained using NiFe films fabricated with 1000 W power and 2.5 mTorr of Ar pressure. The MR ratio of microstructured elements was reduced to 1.31 % and the MR response curves were shown not to saturate due to demagnetizing fields of the elements. When elements were fabricated with 36˚ of misalignment with respect to the exchange field direction using films having 150 Oe exchange field, MR response curve was shifted by 85 Oe, and the operating point of the device shifted to the linear region of the response. Also, the Barkhausen noise was eiminated due to longitudinal bias field originating from the exchange field.
多島海 海上國立公園內의 常綠闊葉樹林에 對한 植物社會學的 硏究 (Ⅲ) : 巨文島의 植生을 中心으로 The Vegetation of Komun-do
金喆洙,박연우,梁孝植,吳長根 木浦大學校 沿岸生物硏究所 1990 沿岸生物硏究 Vol.7 No.1
本 硏究는 多島海 海上國立公園內의 巨文島 植生에 대하여 植物社會學的 調査方法에 따라 1990年 8月 1日부터 6日에 걸쳐 實施하였다. 巨文島의 植生은 동백나무群落, 구실잣밤나무-동백나무群落, 동백나무-까마귀쪽나무混群落, 다정큼나무群落, 돈나무群落, 굴거리群落, 곰솔-동백나무 混?林, 꾸지나무群落, 이대群落, 억새群落 10個 群落으로 區分되었다. 現存植生圖는 植生分類單位와 相觀을 基準으로 하여 동백나무群落, 구실잣밤나무-동백나무群落, 동백나무-까마귀쪽나무混群落, 곰솔-동백나무혼성림, 다정큼나무群落, 돈나무群落, 꾸지나무群落, 이대群落, 草地, 耕作地, 村落, 岩壁등 12個 單位로 區分 製作하였으며, 이를 基準으로하여 綠地自然度圖를 圖示하였다. Komun-do(127°16′30″- 127°24′50″ E. L. and 34°01′- 34°03′N.L.), located in the southern part of Yechon-gun, Korea, is a part of the Dadohae National Marine Park. During August, 1990, the vegetation of this area was surveyed on according to Braun-Blanquet's method. The vegetation was classified into the following 10 communities : Camellia Japonica community, Camellia japonica-Castanopsis cuspidata var. sieboldii, Litsea japonica-Camellia japonica, Raphiolepis umbellata, Pittosporum tobira, Daphniphyllum macropodum, Camellia japonica-Pinus thunbergii, Broussonetia papyrifera, pseudosasa japonica, and Miscanthus sinensis var. purpurascens community. On the basis of the results obtained, the actual vegetation map and the degree of green naturality of Komun-do were mapped on a scale of 1 to 50,000.