兰州大学机构库
Research about passivation layer of SiO2 in GMR sensors for magnetic bead detection
Tan, Xi1; Huang, Dandan1; Zhao, Mingyang1; Cheng, Qionglin1; Ren, Yaqian1; Chen, Yawen1; Yi, Ming1; Ding, Qi1; Zuo, Xianwei2; Wang, Yang2; Song, Yuzhe2; Lu, Qihai2; Han, Genliang2; Li, Hairong1
2023-11-01
Online publication date2023-08
Source PublicationJOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Impact Factor & Quartile
ISSN0304-8853 ; 1873-4766
Volume585
page numbers7
AbstractMore and more research has been conducted on the detection of biomolecules by using magnetic beads as magnetic tags combined with a giant magneto resistance (GMR) sensor. In studies that involve detection using magnetic particles, larger particle sizes are preferred due to their larger magnetic moment, which facilitates detection. Hence, micrometer-scaled magnetic beads are commonly utilized as detection targets. However, in this study, the thickness of the passivation layer was reduced to enable the detection of magnetic beads with a particle size of 200 nm, which is smaller than the usual size. Magnetic beads with an average particle size of 200 nm and high saturation magnetization were synthesized. The impact of magnetic bead size on the sensor surface was investigated by simulating the stray magnetic field generated by magnetic beads ranging from 100 to 1000 nm, taking into account the properties of the magnetic beads. The simulation results reveal that the presence of magnetic beads reduces the total magnetic field on sensor surface, necessitating thinner passivation layers for smaller particle sizes. For the self-developed magnetic beads used in this study, a passivation layer thickness within 200 nm is necessary. To detect the 200 nm magnetic beads, a GMR sensor with a passivation layer thickness of 10-40 nm was fabricated using MEMS technology. The experimental results show that the sensor signal is maximized at an external magnetic field of -20 Oe, and the sensor signal output increases with decreasing passivation layer thickness.
KeywordGMR sensor Magnetic bead Simulation Passivation layer Resistance variation
PublisherELSEVIER
DOI10.1016/j.jmmm.2023.170912
Indexed BySCIE
Language英语
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Condensed Matter
WOS IDWOS:001066971700001
Original Document TypeArticle
Citation statistics
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/569434
Collection兰州大学
Corresponding AuthorLi, Hairong
Affiliation
1.Lanzhou Univ, Sch Phys Sci & Technol, South Tianshui Rd 222, Lanzhou 730000, Peoples R China;
2.Gansu Acad Sci, Inst Sensor Technol, South Dingxi Rd 229, Lanzhou 730000, Peoples R China
Recommended Citation
GB/T 7714
Tan, Xi,Huang, Dandan,Zhao, Mingyang,et al. Research about passivation layer of SiO2 in GMR sensors for magnetic bead detection[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,2023,585.
APA Tan, Xi.,Huang, Dandan.,Zhao, Mingyang.,Cheng, Qionglin.,Ren, Yaqian.,...&Li, Hairong.(2023).Research about passivation layer of SiO2 in GMR sensors for magnetic bead detection.JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,585.
MLA Tan, Xi,et al."Research about passivation layer of SiO2 in GMR sensors for magnetic bead detection".JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 585(2023).
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