发明授权
- 专利标题: GMR sensor stripe for a biosensor with enhanced sensitivity
- 专利标题(中): GMR传感器条带用于具有增强灵敏度的生物传感器
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申请号: US13417398申请日: 2012-03-12
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公开(公告)号: US08728825B2公开(公告)日: 2014-05-20
- 发明人: Po-Kang Wang , Xizeng Shi , Chyu-Jiuh Torng
- 申请人: Po-Kang Wang , Xizeng Shi , Chyu-Jiuh Torng
- 申请人地址: US CA Milpitas
- 专利权人: Headway Technologies, Inc.
- 当前专利权人: Headway Technologies, Inc.
- 当前专利权人地址: US CA Milpitas
- 代理机构: Saile Ackerman LLC
- 代理商 Stephen B. Ackerman
- 主分类号: G01N27/00
- IPC分类号: G01N27/00
摘要:
A GMR sensor stripe provides a sensitive mechanism for detecting the presence of magnetized particles bonded to biological molecules that are affixed to a substrate. The adverse effect of hysteresis on the maintenance of a stable bias point for the magnetic moment of the sensor stripe free layer is eliminated by a combination of biasing the sensor stripe along its longitudinal direction rather than the usual transverse direction and by using the overcoat stress and magnetostriction of magnetic layers to create a compensatory transverse magnetic anisotropy. By connecting the stripes in an array and making the spaces between the stripes narrower than the dimension of the magnetized particle and by making the width of the stripes equal to the dimension of the particle, the sensitivity of the sensor array is enhanced.