• Title/Summary/Keyword: GMR(giant magnetoresistance)-SV(spin valve) device

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Detection of Magnetic Nanoparticles and Fe-hemoglobin inside Red Blood Cells by Using a Highly Sensitive Spin Valve Device

  • Park, Sang-Hyun;Soh, Kwang-Sup;Hwang, Do-Guwn;Rhee, Jang-Roh;Lee, Sang-Suk
    • Journal of Magnetics
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    • v.13 no.1
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    • pp.30-33
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    • 2008
  • A highly sensitive, giant magnetoresistance-spin valve (GMR-SV) biosensing device with high linearity and very low hysteresis was fabricated by photolithography. The detection of magnetic nanoparticles and Fe-hemoglobin inside red blood cells using the GMR-SV biosensing device was investigated. When a sensing current of 1 mA was applied to the current electrode in the patterned active devices with an area of $2{\times}6{\mu}m^2$, the output signals were about 13.35 mV. The signal from even one drop of human blood and nanoparticles in distilled water was sufficient for their detection and analysis.

Detection Property of Red Blood Cell-Magnetic Beads Using Micro Coil-Channeland GMR-SV Device (마이크로 코일-채널과 GMR-SV 소자를 이용한 적혈구-자성비드 검출 특성연구)

  • Park, Ji-Soo;Kim, Nu-Ri;Jung, Hyun-Jun;Lee, Sang-Suk
    • Journal of the Korean Magnetics Society
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    • v.25 no.1
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    • pp.16-21
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    • 2015
  • 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 $1{\mu}m$ passed on the micro channel, the movement of $RBC+{\mu}Beads$ is controlled by the electrical AC input signal. The $RBC+{\mu}Beads$ 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 membrane's deformation of RBC coupled to magnetic beads.

Uniaxial Magnetic Anistotropy of a NiO-Spin Valve Device

  • Lee, Won-Hyung;Hwang, Do-Guwn;Lee, Sang-Suk
    • Journal of Magnetics
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    • v.14 no.1
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    • pp.18-22
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    • 2009
  • The shape anisotropy effect of a giant magnetoresistance-spin valves (GMR-SV) device with a glass/NiO/NiFe/CoFe/Cu/CoFe/NiFe layered structure for use in the detection of magnetic property of molecules within a cell was investigated. The patterned device was given uniaxial anisotropy during the sputtering deposition and vacuum post-annealing, which was performed at $200^{\circ}C$ under a 300 Oe magnetic field. The pattern size of the device, which was prepared through the photolithography process, was $2{\times}15\;{\mu}m^2$. The experimental results confirmed that the best design for a GMR-SV device to be used as a biosensor is to have both the axis sensing current and the easy axis of the pinned NiO/NiFe/CoFe triple layer oriented in the direction of the device's width, while the easy axis of the free CoFe/NiFe bilayer should be pointed along the long axis of the device.

Properties of Exchange Bias Coupling Field and Coercivity Using the Micron-size Holes Formation Inside GMR-SV Film (GMR-SV 박막내 미크론 크기의 홀 형성을 이용한 교환결합세기와 보자력 특성연구)

  • Bolormaa, Munkhbat;Khajidmaa, Purevdorj;Hwang, Do-Guwn;Lee, Sang-Suk;Lee, Won-Hyung;Rhee, Jang-Roh
    • Journal of the Korean Magnetics Society
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    • v.25 no.4
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    • pp.117-122
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    • 2015
  • The holes with a diameter of $35{\mu}m$ inside the GMR-SV (giant magnetoresistance-spin valve) film were patterned by using the photolithography process and ECR (electron cyclotron resonance) Ar-ion milling. From the magnetoresistance curves of the GMR-SV film with holes measuring by 4-electrode method, the MR (magnetoresistance ratio) and MS (magnetic sensitivity) are almost same as the values of initial states. On other side hand, the $H_{ex}$ (exchange bias coupling field) and $H_c$ (coercivity) dominantly increased from 120 Oe and 10 Oe to 190 Oe and 41 Oe as increment of the number of holes inside GMR-SV film respectively. These results were shown to be attributed to major effect of EMD (easy magnetic domian) having a region positioned between two holes perpendicular to the sensing current. On the basis of this study, the fabrication of GMR-SV applying to the hole formation improved the magnetoresistance properties having the thermal stability and durability of bio-device.

Fabrication and Characteristics of a Highly Sensitive GMR-SV Biosensor for Detecting of Micron Magnetic Beads (미크론 자성비드 검출용 바이오센서에 대한 고감도 GMR-SV 소자의 제작과 특성 연구)

  • Choi, Jong-Gu;Lee, Sang-Suk;Park, Young-Seok
    • Journal of the Korean Magnetics Society
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    • v.22 no.5
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    • pp.173-177
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    • 2012
  • 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, $H_{ex}$, and $H_c$ 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.

Post-annealing Effect of Giant Magnetoresistance-Spin Valve Device for Sensor (센서용 거대자기저항 스핀밸브소자의 열처리 효과)

  • Lee, Sang-Suk;Park, Sang-Hyun;Soh, Kwang-Sup;Joo, Ho-Wan;Kim, Gi-Wang;Hwang, D.G.
    • Journal of the Korean Magnetics Society
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    • v.17 no.4
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    • pp.172-177
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    • 2007
  • In order to detect of the magnetic property in the cell unit, we studied the GMR-SV (giant magnetoresistance-spin valves) biosensor, which was depended on the micro patterned features according to two easy directions of longitudinal and transversal axes. Here, the multi layer structure was glass/NiO/NiFe/CoFe/Cu/CoFe/NiFe. The uniaxial anisotropy direction was applied to the patterned biosensor during the deposition and vacuum post-annealing at $200^{\circ}C$ under the magnitude of 300 Oe, respectively. Considering the magnetic shape anisotropy effect, the size of micro patterned biosensor was a $2{\times}5{\mu}m^2$ after the photo lithography process. By our experimental results, we confirmed that the best condition of GMR-SV biosensor should be the same direction of the axis sensing current and the easy axis of pinned NiO/NiFe/CoFe triple layer oriented to the width direction of device, and the direction of the easy axis of free CoFe/NiFe bilayer was according to the longitudinal direction of device.

Fabrication and Property of Water Level and Temperature Sensor for Medical Cooling System Using a Highly Sensitive GMR-SV Device (거대자기저항 스핀밸브 소자를 이용한 의료용 냉각기 수위 및 수온 센서의 제작과 특성)

  • Park, Kwang-Jun;Choi, Jong-Gu;Lee, Sang-Suk;Lee, Bum-Ju
    • Journal of the Korean Magnetics Society
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    • v.21 no.1
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    • pp.32-36
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    • 2011
  • 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 $400\;m{\Omega}/mm$ and $100\;m{\Omega}/^{\circ}C$, respectively.

Detection Property of Red Blood Cell-Magnetic Beads Using Micro Coil-Channel and GMR-SV Device

  • Park, Ji-Soo;Kim, Nu-Ri;Jung, Hyun-Jun;Khajidmaa, Purevdorj;Bolormaa, Munkhbat;Lee, Sang-Suk
    • Proceedings of the Korean Magnestics Society Conference
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    • 2015.05a
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    • pp.161-163
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    • 2015
  • 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 $1{\mu}m$ passed on the micro channel, the movement of RBC + ${\mu}Beads$ is controlled by the electrical AC input signal. The RBC + ${\mu}Beads$ 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 membrane's deformation of RBC coupled to magnetic beads.

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Distribution of Magnetic Field Depending on the Current in the μ-turn Coil to Capture Red Blood Cells (적혈구 포획용 미크론 크기 코일에 흐르는 전류의 크기에 따른 자기장 분포 특성)

  • Lee, Won-Hyung;Chung, Hyun-Jun;Kim, Nu-Ri;Park, Ji-Soo;Lee, Sang-Suk;Rhee, Jang-Roh
    • Journal of the Korean Magnetics Society
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    • v.25 no.5
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    • pp.162-168
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    • 2015
  • The ${\mu}$-turn coil having a width of ${\mu}m$ on the GMR-SV (giant magnetoresistance-spin valve) device based on the antiferromagnetic IrMn layer was fabricated by using the optical lithography process. In the case of GMR-SV film and GMR-SV device, the magnetoresistance ratios and the magnetic sensitivities are 4.4%, 2.0%/Oe and 1.6 %, 0.1%/Oe, respectively. In the y-z plane the distribution of magnetic field of GMR-SV device and $10{\mu}$-turns coil which put under the several magnetic bead(MB)s with a diameter of $1{\mu}m$ attached to RBC (red blood cell) was analyzed by the computer simulation using the finite element method. When the AC currents of 20 kHz from 0.1 mA to 10.0 mA flow to the 10 turns ${\mu}$-coil, the magnetic field at the position of $z=0{\mu}m$ at the center of coil was calculated from $30.1{\mu}T$ to $3060{\mu}T$ in proportion to the current. The magnetic field at the position of $z=10{\mu}m$ was decreased to one-sixth of that of $z=0{\mu}m$. It was confirmed that the $10{\mu}$-turn coil having enough magnitude of magnetic field for the capture of RBC is possible to use as a biosensor for the detection of magnetic beads attached to RBC.

The Detection of Magnetic Properties in Blood and Nanoparticles using Spin Valve Biosensor (스핀밸브 바이오 센서를 이용한 혈액과 나노입자의 자성특성 검출)

  • Park, Sang-Hyun;Soh, Kwang-Sup;Ahn, Myung-Cheon;Hwang, Do-Guwn;Lee, Sang-Suk
    • Journal of the Korean Magnetics Society
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    • v.16 no.3
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    • pp.157-162
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    • 2006
  • In this study, a high sensitive giant magnetoresistance-spin valve (GMR-SV) bio-sensing device with high linearity and very low hysteresis was fabricated by photolithography and ion beam deposition sputtering system. Detection of the Fe-hemoglobin inside in a red blood and magnetic nanoparticles using the GMR-SV bio-sensing device was investigated. Here a human's red blood includes hemoglobin, and the nanoparticles are the Co-ferrite magnetic particles coated with a shell of amorphous silica which the average size of the water-soluble bare cobalt nanoparticles was about 9 nm with total size of about 50 nm. When 1 mA sensing current was applied to the current electrode in the patterned active GMR-SV devices with areas of $5x10{\mu}m^2 $ and $2x6{\mu}m^2 $, the output signals of the GMRSV sensor were about 100 mV and 14 mV, respectively. In addition, the maximum sensitivity of the fabricated GMR-SV sensor was about $0.1{\sim}0.8%/Oe$. The magnitude of output voltage signals was obtained from four-probe magnetoresistive measured system, and the picture of real-time motion images was monitored by an optical microscope. Even one drop of human blood and nanopartices in distilled water were found to be enough for detecting and analyzing their signals clearly.