1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Scanning probe measurements on a magnetic bead biosensor
Rent:
Rent this article for
USD
10.1063/1.2752144
/content/aip/journal/jap/102/1/10.1063/1.2752144
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/1/10.1063/1.2752144
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Microscopy image of a biosensor chip, showing two narrow giant magnetoresistance sensor strips, flanked by three conducting wires. A cross section of the device and the probe tip is indicated schematically.

Image of FIG. 2.
FIG. 2.

(Color online) Height images of two GMR sensor pairs (dim lines) flanked by thick conducting wires (bright), recorded using [(a), (b), and (c)] a sharp tip with bead attached on the side or [(d), (e), (f)] a probe with a fractured tip so the bead touches the surface. Inset: SEM micrograph of tip with bead on cantilever. [(c) and (f)] The simultaneously recorded electrical signal from the magnetic field sensor strip (indicated with arrows), together with model curves for a point dipole and for a spherical volume of independently magnetized dipoles.

Image of FIG. 3.
FIG. 3.

Sensor signal, averaged along the strip, recorded at various heights above the sensor. The height increment is .

Image of FIG. 4.
FIG. 4.

(Color online) Signal voltage induced in the magnetic sensor by the presence of a bead, both measured (a) and calculated (b), in good agreement. The magnetic field lines are indicated. The geometrically inaccessible region is shaded in (b).

Image of FIG. 5.
FIG. 5.

(Color online) Bead magnetic moment (a) and GMR sensor resistance (b) with applied magnetic field. Large and small loops coincide, demonstrating reproducibility.

Image of FIG. 6.
FIG. 6.

(Color online) Ratio of peak to valley voltages vs height above the sensor surface, measured for several bead/tip combinations, together with model curves for a point dipole (solid curve) and for a spherical particle of independently magnetized dipoles (dotted). The solid symbols correspond to Fig. 2(f).

Loading

Article metrics loading...

/content/aip/journal/jap/102/1/10.1063/1.2752144
2007-07-10
2014-04-25
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Scanning probe measurements on a magnetic bead biosensor
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/1/10.1063/1.2752144
10.1063/1.2752144
SEARCH_EXPAND_ITEM