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RISS 인기검색어
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- 저자 : 최상대(S. D. Choi) (검색결과 6 건)
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Laser 열처리를 이용한 FeMn / NiFe 박막의 자화 반전
최상대(S. D. Choi),진대현(D. H. Jin),김선욱(S. W. Kim),김영식(Y. S. Kim),이기암(K. A. Lee),이상석(S. S. Lee),황도근(D. G. Hwang) 한국자기학회 2004 한국자기학회지 Vol.14 No.6
We have studied local magnetization reversal and magnetic properties induced by Laser annealing method in the strip-patterned Ta/NiFe/FeMn/Ta and Ta/NiFe/FeMn/NiFe/Ta multilayers fabricated by ion-beam deposition. The films were exposed to the emission of the DPSS (Diode Pumped Solid State, Nd:YAG) laser under 600 G. The laser beam intensity increased up to 440 ㎽. When the laser illuminated the patterned film with the power of above 200 ㎽, the intensity of MR peak located in +87 Oe shrunk. A new MR peak was generated at -63 Oe. When the laser power is 400 ㎽, the location of positive MR peak(Hex) was changed slightly from +87 Oe to +76 Oe, and the MR ratio was decreased from 0.9% to 0.1 %. On the other hand, the new (negative) MR peak shifted from -63 Oe to -80 Oe, with the MR ratio increased up to 0.3%. As the illuminated area expanded, the intensity of opposite MR peak increased and it of negative MR peak decreased. This proved that the local reversal of exchange biasing should be realized by laser annealing.
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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.
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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.
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