Detection of 130 nm magnetic particles by a portable electronic platform using spin valve and magnetic tunnel junction sensors

被引：29

作者：

Cardoso, F. A. ^{[1
,2
]}

Germano, J. ^{[2
,4
]}

Ferreira, R. ^{[1
,2
]}

Cardoso, S. ^{[1
,2
]}

Martins, V. C. ^{[1
,3
]}

Freitas, P. P. ^{[1
,2
]}

Piedade, M. S. ^{[2
,4
]}

Sousa, L. ^{[2
,4
]}

机构：

[1] INESC MN, P-1000029 Lisbon, Portugal

[2] Univ Tecn Lisboa, Inst Super Tecn, P-1000029 Lisbon, Portugal

[3] Ctr Biol & Chem Engn CEBQ, Inst Super Tecn, P-1000029 Lisbon, Portugal

[4] INESC ID, P-1000029 Lisbon, Portugal

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 07期

关键词：

D O I：

10.1063/1.2836713

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An integrated biosensor with magnetic tunnel juntions (MTJs) and spin valve (SV) sensor was used for 130 nm particle detection. A platform drives an external magnet generating an in-plane dc+ac magnetic field on the sensor at frequencies up to 375 Hz, provides a current to bias the sensor, and performs the signal acquisition and treatment. The signal-to-noise ratio of the SV and MTJ was characterized. Bead detection (130 nm in diameter) was performed using both sensors leading to a detection limit of 3 x 10(8) particles/ml for SV and 3 x 10(10) particles/ml for MTJ. (c) 2008 American Institute of Physics.

引用

页数：3

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