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Magnetic Properties of Co-P and Co-P-Cr Thin Films for Longitudinal Magnetic Recording
장평우(Pyung Woo Jang),손홍균(Hong Kyun Sohn),이택동(Taek Dong Lee) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2
In order to develop new magnetic media with higher coercivity, we have investigated the magnetic properties of Co-P/Cr and Co-P-Cr/Cr films. The coercivity of Co-P binary films deposited at RT was around 835 Oe in the range of 9-12 at. % P. In the Co-P binary system coercivity decreased with increasing substrate temperature for P contents of 9-12 at.%, which may be due to the decomposition of Co-P single phase to Co and Co₂P phase. However, the coercivity of the films containing more than 12 at. % P is very low due to the formation of amorphous phase. The coercivity of Co-P-Cr ternary films increased with increasing Cr contents and reached the maximum value of 1020 Oe in the water cooled C0_(84)P_(10)Cr_6 film.
정준철 ( Joon-cheol Jeong ),김우철 ( Woo-cheol Kim ),김경민 ( Kyung Min Kim ),손홍균 ( Hong-kyun Sohn ),김정구 ( Jung-gu Kim ),이수열 ( Soo-yeol Lee ),김희산 ( Heesan Kim ) 한국부식방식학회(구 한국부식학회) 2020 Corrosion Science and Technology Vol.19 No.6
Failure analysis on the welded type 304 pipe used for cooling water piping in the district heating primary side was conducted. Inorganic elements and bacteria in the cooling water and in corrosion products were analyzed, and the weldment was inspected by microscopy and a sensitization test. Corrosion damages were observed in the heat-affected zone, on weld defects such as incomplete fusion or excessive penetration caused by improper welding, or/and at the 6 o'clock position along the pipe axial direction. However, the level of concentration of chloride in the cooling water as low as 80 ppm has been reported to be not enough for even a sensitized type 304 steel, meaning that the additional corrosive factor was required for these corrosion damages. The factor leading to these corrosion damages was drawn to be the metabolisms of the types of bacteria, which is proved by the detection of proton, sulfur containing species, biofilms, and both bacteria and corrosion product analyses.
박창민(Chang Min Park),신경호(Kyung Ho Shin),손홍균(Hong Kyun Sohn),이택동(Taek Dong Lee) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.2
We produced (Co_(93)Cr_7)-P-Ni thin films for longitudinal magnetic recording media using DC magnetron sputtering system. The variation of magnetic properties of (Co_(93)Cr_7)-P-Ni pseudo-ternary system with the composition was examined. We obtained the coercivity up to 1500 Oe. The coercivity increase could be ascribed to in-plane anisotropy enhancement, grain size decrease, magnetic decoupling between particles. TEM micrographs showed that the grains were well-decoupled by the addition of phosphorous.