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Gate Field Effect on Spin Transport Signals in a Lateral Spin-Valve Device
구현철,권재현,장준연,한석희,엄종화 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
The gate field effect on spin transport signals was detected in lateral ferromagnet-semiconductor hybrid devices. In the diffusive model, the change in the channel resistance induces a spin transport signal difference, but a non-local measurement shows that ΔR is almost constant with varying the gate voltage. The reason is that the spin diffusion length is slightly decreased with decreasing gate voltage due to the stronger spin-orbit interaction. At T = 20 K, the spin diffusion length can be decreased by 2.5 % by applying a gate voltage of -3 V. The gate field effect on spin transport signals was detected in lateral ferromagnet-semiconductor hybrid devices. In the diffusive model, the change in the channel resistance induces a spin transport signal difference, but a non-local measurement shows that ΔR is almost constant with varying the gate voltage. The reason is that the spin diffusion length is slightly decreased with decreasing gate voltage due to the stronger spin-orbit interaction. At T = 20 K, the spin diffusion length can be decreased by 2.5 % by applying a gate voltage of -3 V.
노종욱,이영택,이경일,전진,손오택,정효일,이우영 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
We report the real-time detection of nano-sized magnetic beads for biological applications using highly sensitive spin-valve devices with nano-oxide layer (NOL) exhibiting an 8.5% magnetoresistance (MR) ratio. A combination of photolithography and lift-off process was employed to place nano-sized magnetic beads on the active area of a spin-valve device. The spin-valve device was found to show a signal voltage change of 0.28 μV in the presence of a cluster of nano-sized magnetic beads by comparing the signal voltage difference between the sensing spin-valve device and a reference spin-valve device. The real-time detection of nano-sized magnetic beads was found successfully achieved by direct measurement of the magnetic dipole fields emanating from clusters of nano-sized magnetic beads on the spin-valve device.
마이크로 코일-채널과 GMR-SV 소자를 이용한 적혈구-자성비드 검출 특성연구
박지수(Ji-Soo Park),김누리(Nu-Ri Kim),정현준(Hyun-Jun Jung),이상석(Sang-Suk Lee) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.1
The micro device, coil, and channel for the biosensor integrated with the GMR-SV device based on the antiferromagnetic IrMn layer was fabricated by the light lithography process. When RBCs coupled with several magnetic beads with a diameter of 1 μm passed on the micro channel, the movement of RBC + μBeads is controlled by the electrical AC input signal. The RBC + μBeads having a micro-magnetic field captured above the GMR-SV device is changed as the output signals for detection status. From these results, the GMR-SV device having the width magnitude of a few micron size can be applied as the biosensor for the analysis of a new magnetic property as the membranes deformation of RBC coupled to magnetic beads.
GMR-SV바이오센서를 이용한 적혈구와 붙은 미크론 자성비드 신호 검출 특성 연구
이재연,김문종,이상석 한국물리학회 2014 새물리 Vol.64 No.10
The magnetic properties for the glass/Ta (5 nm)/NiFe (10 nm)/Cu (2.5 nm)/NiFe (5 nm)/FeMn (10 nm)/Ta (5 nm) multilayer structure-type GMR-SV (giantmagneto resistance-spin valve) film deposited by using a dc magnetron sputtering system include a magnetoresistance ratio (MR) of 4.5% and a magnetic sensitivity (MS) of 2.4%/Oe. In order to analyze the magnetic output signal of several magnetic $\mu$-beads attached to RBCs (red blood cells), we fabricated a GMR-SV biosensor having a width of 2 μm ~ 10 μm by using the light lithography process. The magnitude of the output signal for several magnetic beads with diameters of 1 μm attached to RBCs dropped, as recorded by the GMR-SV device, appeared to be 0.25 mV around 0 Oe. This implies that the GMR-SV biosensor can analyze the coupling force between hemoglobin and the magnetic beads and changes in the features of RBCs. Dc 마그네트론 스퍼터링법으로 증착한 Ta (5.0 nm)/NiFe (10 nm)/Cu (2.5 nm)/NiFe (5 nm)/FeMn (10 nm)/Ta (5 nm) 다층구조형 거대자기저항-스핀밸브 (GMR-SV) 박막은 자기저항비 4.5%와 자장감응도 2.4%/Oe 인 자기저항 특성을 가진다. 적혈구에 1 μm 크기 초상자성체 자성비드 여러 개가 붙은 적혈구의 자성특성 신호를 분석할 수 있도록 GMR-SV 박막에 광 리소그래피 공정을 적용하여 1 μm ~ 10 μm 선폭을 갖는 바이오센서를 제작하였다. 적혈구와 붙은 미크론 자성비드를 검출한 출력신호 크기는 0 Oe 부근에서 0.25 mV를 나타냈다. 이것은 헤모글로빈에 붙은 자성비드가 붙은 결합력이나 미크론 크기인 적혈구 모양 변화를 분석하는 GMR-SV 바이오센서로 활용할 수 있으리라 사료된다.
GMR-SV 소자를 이용한 미크론 자성비드와 결합된 적혈구 검출 특성 연구
이재연(Jae-Yeon Lee),김문종(Moon-Jong Kim),이상석(Sang-Suk Lee),이진규(Jin-Kyu Rhee) 한국자기학회 2014 韓國磁氣學會誌 Vol.24 No.4
The glass/Ta(5.8 nm)/NiFe(5 nm)/Cu(2.3 nm)/NiFe(3 nm)/IrMn(12 nm)/Ta(5.8 nm) GMR-SV (giantmagneto- resistance-spin valve) multilayer structure films with a magnetoresistance ratio (MR) of 5.0 % and a magnetic sensitivity (MS) of 1.5%/Oe was deposited by dc magnetron sputtering method. Also, GMR-SV device having a width of 7 μm~8 μm similar to the diameter of RBC (red blood cell) was fabricated by the light lithography process. When RBCs coupled with several magnetic beads with a diameter of 1 μm dropped upon the GMR-SV device having MR = 1.06% and MS = 0.3 %/Oe, there is observed the variation of about included of a resistance value of ΔR = 0.4 Ω and ΔMR = 0.15% around a external magnetic field of ?0.6 Oe. From these results, the GMR-SV device having the width magnitude of a few micron size can be applied as the biosensor for the analysis of a new magnetic property of hemoglobin inside of RBC combined to magnetic beads.
거대자기저항 스핀밸브 소자를 이용한 의료용 냉각기 수위 및 수온 센서의 제작과 특성
박광준(Kwang-Jun Park),최종구(Jong-Gu Choi),이상석(Sang-Suk Lee),이범주(Bum Ju Lee) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.1
We fabricated a sensor for measuring the water level and water temperature using GMR-SV (giant magnetoresistance-spin valve) device, simultaneously. It could be applied to the medical cooling system of the potassium titanylphosphate KTP) laser system for the therapy of a benign prostatic hyperplasia. The middle point of GMR-SV device was set to the near position of a high magnetic sensitivity with 2.8%/Oe. The sensitivity for the water level and water temperature of the fabricated sensor were 400 mΩ/mm and 100 mΩ/℃, respectively.
미크론 자성비드 검출용 바이오센서에 대한 고감도 GMR-SV 소자의 제작과 특성 연구
최종구(Jong-Gu Choi),이상석(Sang-Suk Lee),박영석(Young-Seok Park) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.5
The multilayer structure of glass/Ta(5.8 nm)/NiFe(5 nm)/Cu(t nm)/NiFe(3 nm)/FeMn(12 nm)/Ta(5.8 nm) as typical GMR-SV (giant magnetoresistance-spin valve) films is prepared by ion beam sputtering deposition (IBD). The coercivity and magnetoresiatance ratio are increased and decreased for the decrease of Cu thickness when the thickness of nonmagnetic Cu layer from is varied 2.2 nm to 3.0 nm. It means that the decrease of non-magntic layer is effected to the interlayer exchange coupling of pinned layer and the spin configuration array of free layer. For experiment of detecting and dropping of magnetic beads we used the GMR-SV sensor with glass/ Ta/NiFe/Cu/NiFe/FeMn/Ta structure. From the comparison of before and after for the dropping status of magnetic bead, the variations of MR ratio, Hex, and Hc are showed 0.9 %, 3 Oe, and 2 Oe, respectively. The fabrication of GMR-SV sensor was included in the process of film deposition, photo-lithography, ion milling, and MR measurement. Further, GMR-SV device can be easily integrated so that detecting biosensor on a single chip becomes possible.
IrMn 스핀밸브 박막소자의 폭 크기에 의존하는 자장감응도
최종구(Jong-Gu Choi),이상석(Sang-Suk Lee) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.2
The Cu thickness dependence of magnetic sensitivity for the NiFe/Cu/NiFe/IrMn spin valve multilayer was investigated. The magnetic properties measured by minor MR curves for the Ta(5 ㎚)/NiFe(8 ㎚)/Cu(3.5 ㎚)/NiFe(4 ㎚)/IrMn(8 ㎚)/Ta(2.5 ㎚) multilayer is MR = 1.46 %, MS = 2.0 %/Oe, H<SUB>c</SUB> = 2.6 Oe, and H<SUB>int</SUB>= 0.1 Oe. The magnetic sensitivities of GMR-SV devices with ten different widths and a same length of 4.45 ㎛ by fabricated by photo lithography decreased from 0.3 %/Oe to 0.06%/Oe as from a width of 10 ㎛ to 1 ㎛.