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Magnetoresistive DNA chips based on ac field focusing of magnetic labels
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View: Figures


Image of FIG. 1.
FIG. 1.

U-shaped spin-valve sensor transfer curve. Inset: sensing unit comprised of the spin valve within a U-shaped aluminum current line.

Image of FIG. 2.
FIG. 2.

Output of an array of sensors vs particle (squares), and bead (triangles) concentrations. Outputs are shown for signal (11 sensors; filled symbol) and reference sensors (five sensors; empty symbol). Error bars correspond to standard deviations.

Image of FIG. 3.
FIG. 3.

Sensor output in function of the percent (%) coverage of the sensor surface with particles (squares) and microspheres (triangles). The continuous and dashed curves result from a model described in the text for the sensor output. The dotted line translates the present system detection limit. Error bars correspond to standard deviations from experimental data and the resulting estimation of particle numbers.

Image of FIG. 4.
FIG. 4.

Noise spectra for a U-shaped spin-valve sensor in the linear regime and with a sense current of . A fit is shown for the noise and thermal contributions and the calculated thermal background is also displayed.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetoresistive DNA chips based on ac field focusing of magnetic labels