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InAs quantum well Hall devices for room-temperature detection of single magnetic biomolecular labels
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10.1063/1.2767385
/content/aip/journal/jap/102/3/10.1063/1.2767385
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/3/10.1063/1.2767385
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) The noise-equivalent magnetic moment resolution of a 2DEG Hall sensor as a function of the Hall cross width and the distance from the magnetic dipole. The curves are calculated according to Eq. (12). Upper inset: Schematic diagram of the configuration used in the derivation of Eq. (9). Lower inset: An example of a magnetic field distribution within the Hall cross area in a 2DEG plane calculated according to Eq. (9).

Image of FIG. 2.
FIG. 2.

(Color online) A typical Langevin response of a superparamagnetic bead to an applied magnetic field and a sketch of the physical principle underlying the detection method. , , and represent rms values of the corresponding ac quantities. Inset shows the expected Hall voltage signal upon applying the dc field when the bead is (red) and is not (black) present on the Hall cross.

Image of FIG. 3.
FIG. 3.

(Color online) Hall voltage output of the micro-Hall sensor as a function of externally applied perpendicular magnetic field for several dc bias currents. Upper inset: The Hall resistance as a function of the magnetic field for different dc bias currents. Lower inset: SEM image of the Hall cross used in the measurements, adapted to show the actual measurement configuration.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Noise voltage spectral density as a function of frequency measured at Hall voltage contacts for several different dc bias currents. Inset shows a SEM image of the Hall cross used in the measurements, adapted to show the actual measurement configuration. (b) Noise-equivalent magnetic field resolution of the sensor as a function of frequency for several different dc bias currents and zero external magnetic field.

Image of FIG. 5.
FIG. 5.

Noise-equivalent magnetic moment resolution of the sensor as a function of frequency.

Image of FIG. 6.
FIG. 6.

(Color online) (a) Conductivity noise voltage PSD for several different bias currents measured at Hall voltage contacts in zero magnetic field. (b) Conductivity noise voltage PSD measured at Hall voltage contacts as a function of bias current squared for several different frequencies. The lines are linear fits to the data. (c) Product of frequency and conductivity noise voltage PSD normalized to the bias current squared as a function of frequency for a bias current of . The red line is a fit according to Eq. (14).

Image of FIG. 7.
FIG. 7.

(Color online) The longitudinal conductivity noise voltage PSD for several different bias currents obtained from the measurements along the longitudinal direction of the Hall bar structure. A SEM image is shown in the inset. The data are obtained in zero external magnetic field.

Image of FIG. 8.
FIG. 8.

(Color online) (a) A SEM image of two adjacent Hall crosses with a diameter superparamagnetic bead positioned on one of them. The image was adapted to show the actual detection measurement configuration. (b) ac Hall voltage as a function of time for the two crosses shown in part (a) of the figure. The drop in the signal from one cross upon applying the static field is due to the presence of the bead. The blue arrows indicate the moments of time when was applied (↓) and removed (↑), respectively.

Image of FIG. 9.
FIG. 9.

(Color online) (a) A SEM image of the Hall cross with Nanomag D-250 superparamagnetic beads. Six beads are located in the Hall cross area (marked as a red square for clarity). (b) Hall voltage signal as a function of time from the Hall cross shown in part (a) of the figure. The drop in the signal upon applying the static field is due to the presence of the beads.

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/content/aip/journal/jap/102/3/10.1063/1.2767385
2007-08-07
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: InAs quantum well Hall devices for room-temperature detection of single magnetic biomolecular labels
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/3/10.1063/1.2767385
10.1063/1.2767385
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