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안명천,최상대,주호완,김기왕,황도근,이장로,이상석,Ahn, M.C.,Choi, S.D.,Joo, H.W.,Kim, G.W.,Hwang, D.G.,Rhee, J.R.,Lee, S.S. 한국자기학회 2007 한국자기학회지 Vol.17 No.4
To develop array magnetic sensors, specular-type giant magnetoresistive- spin valve (GMR-SV) film of Glass/Ta(5)MiFe(7)/IrMn(10)NiFe(5)/$O_2$/CoFe(5)/Cu(2.6)/CoFe(5)/$O_2$/NiFe(7)/Ta(5)(nm) was deposited by using a high-vacuum sputtering system. One of 15 way sensors in the area of $8{\times}8mm^2$ was Patterned a size of $20{\times}80{\mu}m^2$ in multilayer sample by Photo-lithography. All of 15 sensors with Cu electrodes were measured a uniform magnetic properties by 2-probe method. The highest magnetic sensitivity of MR and output voltage measured nearby an external magnetic field of 5 Oe were MS = 0.5%/Oe and ${\triangle}$V= 3.0 mV, respectively. An easy-axis of top-free layers of $CoFe/O_2/NiFe$ with shape anisotropy was perpendicular to one of bottom-pinned layers $IrMn/NiFe/O_2/CoFe$. When the sensing current increased from 1 mA to 10 mA, the output working voltage uniformly increased and the magnetic sensitivity was almost stable to use the nano-magnetic devices with good sensitive properties.
최상대(S. D. Choi),김미선(M. S. Kim),안명천(M. C. Ahn),최영근(Y. G. Choi),김기왕(G. W. Kim),박달호(D. H. Park),황도근(D. G. Hwang),이상석(S. S. Lee) 한국자기학회 2006 한국자기학회지 Vol.16 No.4
The electric signals for the voltage as a function of distance between Hall devices and permanent magnets over the radial artery were investigated. The electric signals, that means signals of arterial pulse wave, were differentiated by the hardware of circuits and then were changed to differential signals as magnetic field. The 3-D images simulated by the software as function of the intensity of differential signals were achieved. It shows that these system can apply to pulse diagnostic apparatus of portable type medical instrument.
2차원 배열 자기저항소자를 이용한 공간 맥진파형의 전산모사 분석
김미선(M. S. Kim),김선욱(S. W. Kim),김기왕(G. W. Kim),이수진(S. J. Lee),이선구(S. G. Lee),이현숙(H. S. Lee),박달호(D. H. Park),황도근(D. G. Hwang),이상석(S. S. Lee) 한국자기학회 2005 한국자기학회지 Vol.15 No.6
To get the spatial feature of arterial pulse, we designed spatial pulse diagnostic apparatus (SPDA) using a 2-dimensional magnetoresistive sensor array. The magnetic field distribution for magnet array was simulated using finite element method. We recognized that the field distribution of parallel magnet arrays was more sensitive and uniformed than that of perpendicular one. Also the spatial displacements of magnet array were agreed with the output signal of magnetic tunnel junction (MTJ) sensor array.