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Highly-sensitive magnetic sensor for detecting magnetic nanoparticles based on magnetic tunnel junctions at a low static field
- Source :
- AIP Advances, Vol 11, Iss 1, Pp 015046-015046-5 (2021)
- Publication Year :
- 2021
- Publisher :
- AIP Publishing LLC, 2021.
-
Abstract
- Magnetic sensors to detect magnetic nanoparticles (MNPs) towards biomedical applications require very high sensitivity at low magnetic fields. Here we report a magnetic sensor consisting of a magnetic tunnel junction (MTJ) with a synthetic antiferromagnetic free layer. This sensor exhibits a low magnetic anisotropy and sensitivities of over 18%/Oe at low fields in the range of 0 to 3 Oe. We employ superparamagnetic MNPs with a large diameter of 200 nm. The sensor’s transfer curves show the magnetoresistance (MR) variations as a function of MNP concentration. We demonstrate the detection capability of MNP amounts of below 500 ng and low MNP concentrations of 0.01, 0.1, and 1 mg/ml in solvents. This result suggests that the combination of high-sensitivity TMR sensors and large MNPs has a substantial potential for biomarker detection applications.
- Subjects :
- 010302 applied physics
Materials science
Magnetoresistance
business.industry
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
lcsh:QC1-999
Highly sensitive
Magnetic field
Magnetic anisotropy
Tunnel magnetoresistance
0103 physical sciences
Antiferromagnetism
Optoelectronics
Magnetic nanoparticles
0210 nano-technology
business
lcsh:Physics
Superparamagnetism
Subjects
Details
- Language :
- English
- ISSN :
- 21583226
- Volume :
- 11
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- AIP Advances
- Accession number :
- edsair.doi.dedup.....498c648c720ffad5654555ca8783185a