Journal article
On-chip measurement of the Brownian relaxation frequency of magnetic beads using magnetic tunneling junctions
In
Applied Physics Letters
—
2011, Volume 98, Issue 7, pp. 073702
Abstract
We demonstrate the detection of the Brownian relaxation frequency of 250 nm diameter magnetic beads using a lab-on-chip platform based on current lines for exciting the beads with alternating magnetic fields and highly sensitive magnetic tunnel junction (MTJ) sensors with a superparamagnetic free layer.
The first harmonic out-of-phase component of the MTJ response gives the imaginary part of the magnetic bead susceptibility, which peaks at the Brownian relaxation frequency. This work paves the way to on-chip implementation of Brownian magnetorelaxometry in innovative "lab-on-a-bead" assays for biomolecular recognition. (C) 2011 American Institute of Physics. [doi:10.1063/1.3554374]
| Language: | English |
|---|---|
| Publisher: | American Institute of Physics |
| Year: | 2011 |
| Pages: | 073702 |
| ISSN: | 10773118 and 00036951 |
| Types: | Journal article |
| DOI: | 10.1063/1.3554374 |
| ORCIDs: | Hansen, Mikkel Fougt |
