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(a) Schematic illustration of the optical tweezers setup. (b) Macroscopic response of the SV sensor to an external field applied along the -axis direction. (c) Schematic of a magnetic microbead over a SV sensor with corresponding axes and magnetization directions. (d) Schematic of the optical trapping of a magnetic particle.
(a) Optical image of sensor chip with liquid layer enclosed by a PDMS window (b) Optical image of an individual spin valve sensor. (c) Image of optical tweezers beam and magnetic particles with respect to the SV sensor.
Real time response (without gain) of the SV due to the laser and a single magnetic particle. Sensor response is given by , where is the measured voltage and is a fixed reference voltage obtained before the experiment starts. (a) Optical tweezers were used to position a particle at the center of the SV. (b) Laser light was blocked leaving the particle at the center of the SV. (c) Laser was unblocked to capture and move the particle to position in (d). (e) Laser light was blocked, this time leaving the particle to the right of the SV. (f) Particle moved and settled on the lower edge of the SV.
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