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NiFeCr/(Cu/Co<SUB>90</SUB>Fe<SUB>10</SUB>) × N/NiFeCr 다층박막의 자기변형과 응력에 관한 연구
조순철(Soonchul Jo) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.1
The magnetostriction and stress of multilayer NiFeCr/(Cu/Co<SUB>90</SUB>Fe<SUB>10</SUB>) × N/NiFeCr films were investigated. As the number of Cu 15Å/CoFe 15Å bilayers was increased, the saturation magnetostriction decreased from ?5.6 × 10<SUP>?6</SUP> at 2 bilayers to ?8.5 × 10<SUP>?6</SUP> at 20 bilayers. A change of CoFe thickness from 10 to 20Å caused a decrease in the magnitude of tensile stress from 980MPa to 590MPa as the number of Cu 15Å/CoFe 15Å bilayers increased from 2 to 20. The maximum magnetostrictive anisotropy field that could be developed due to nonzero magnetostriction and stress is calculated to be 135.7 Oe when the number of Cu 15Å/CoFe 15Å bilayers is 10.
MIG 헤드 가상 갭에 의한 재생 전압 스펙트럼 Bump의 컴퓨터 시뮬레이션
한은실(Eun Sil Han),조순철(Soonchul Jo) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2
This paper describes the occurance of bumps in playback spectrum while reading with MIG heads. The amplitudes of the bumps in theoretically predicted frequencies are investigated by computer simulation. Three cases of MIG head structure are simulated, one without pseudo gaps, the other two with pseudo gap thicknesses of 0.02㎛, and 0.2㎛ on both sides of the main gap, respectively. It is assumed that metal powder tapes are used. The results show that the bumps occur at predicted frequencies and the amplitudes of the bumps agree well with predicted values.
도메인 확장형 광자기 디스크의 온도분포 및 재생신호 시뮬레이션
양재남(Jaenam Yang),조순철(Soonchul Jo) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.2
Read out signal and temperature distribution of magnetic amplifying magnetooptical disk were studied. Temperature distribution of recording layer and adjacent layers were calculated when the disk was at rest. Mark size, length and location were simulated from a chain of recording beam pulses. In addition, signal amplitude depending on the shape of the marks, readout signals from the recording layer and amplified marks of the readout layer, were simulated. Simplified thermal conduction model was used to calculate the temperature distribution of recording and adjacent layers as a function of time as well as to calculate the mark size, length and location. Readout signal was calculated by the convolution of the disk reflectivity and the Gaussian beam intensity. Readout signal from the mark in the readout layer amplified to the size of the laser beam turned out to be twice as large as the signal from the crescent shaped mark in the recording layer.
평면 실리콘 헤드를 사용한 하드 디스크 드라이브 시스템의 Average Bit Error Rate 시뮬레이션
서정욱(Jungwook Seo),조순철(Soonchul Jo),김용수(Young-Su Kim),노광춘(Chun-Kwang Ro) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.6
The average bit error rate (ABER) for a hard disk drive (HDD) system using planar silicon heads was calculated. To calculate the ABER, the head field distribution using 3 dimensional finite element method and error rate response surface (ERRS) were obtained. Then the ABER was simulated by convolving the calculated ERRS with track misregistration(TMR). For the average bit error rate of 10^(-6) and the track pitch of 3.7 ㎛, the allowable TMR was 0.36 ㎛, about 9.7 % of the track pitch.
김지원(Jiwon Kim),조순철(Soonchul Jo),김상윤(Sang Yoon Kim),고훈(Hoon Ko),이창우(Chang-Woo Lee) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.5
In this paper, magnetic properties and annealing behavior of spin valve structures using Mo(MoN) layers as underlayers were studied varying the thickness of the underlayers. The spin valve structure was consisted of Si substrate/SiO₂(2,000Å)/Mo(MoN)(tÅ)/NiFe(21Å)/CoFe(28Å)/Cu(22Å)/CoFe(18Å)/IrMn(65Å)/Ta(25Å). Also, MoN films were deposited on Si substrates and their thermal annealing behavior was analyzed. The resistivity of the MoN film increased as the N2 gas flow rate was increased. After annealing at 600 ℃, XRD results did not show peaks of silicides. XPS results indicated MoN film deposited with 5 sccm of N2 gas flow rate was more stable than the film deposited with 1 sccm of N2 gas flow rate. The variations of MR ratio and magnetic exchange coupling field were small for the spin valve structures using Mo(MoN) underlayers up to thickness of 45Å. MR ratio of spin valves using MoN underlayers deposited with various N₂ gas flow rate was about 7.0% at RT and increased to about 7.5 % after annealing at 220 ℃. Upon annealing at 300 ℃, the MR ratio decreased to about 3.5 %. Variation of N2 gas flow rate up to 5 sccm did not change the MR ratio and H<SUB>ex</SUB> appreciably.