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On-chip measurement of the Brownian relaxation frequency of magnetic beads using magnetic tunneling junctions
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10.1063/1.3554374
/content/aip/journal/apl/98/7/10.1063/1.3554374
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/7/10.1063/1.3554374
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Chip design . Each of the eight MTJ sensors is provided with two independent contacts for the bottom and top electrodes while there are two independent CLs. The larger rectangle indicates the outline of the fluid channel. An optical image of the MTJ sensor is shown on the right, with the direction of the currents in the CLs , in the sensor , and of the field produced by the CLs on the sensor plane. The CLs lie on top of the MTJ sensors, separated by 200 nm of . (b) Sensor transfer curve measured with at 1 kHz; is .

Image of FIG. 2.
FIG. 2.

(a) Arrow plot in the plane of the magnetic field generated by a current flowing in the positive -direction in the two CLs. (b) calculated in the sensor plane for a magnetic bead positioned at different heights ; the magnetic field is normalized to the modulus of the maximum average field (calculated at a distance ).

Image of FIG. 3.
FIG. 3.

(a) vs time for at , . A suspension of 250 nm Micromod Nanomag-D beads with concentration 0.3 mg/ml was injected in the fluidic channel after 35 s and washed after 210 s. (b) Values of and measured vs frequency of the current in the CLs for and . The solid lines are fits to the Cole–Cole expression.

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/content/aip/journal/apl/98/7/10.1063/1.3554374
2011-02-15
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: On-chip measurement of the Brownian relaxation frequency of magnetic beads using magnetic tunneling junctions
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/7/10.1063/1.3554374
10.1063/1.3554374
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