Abstract: A circuit for controlling an electromagnetic head module to detect antigens on a biosample track comprising a processor for receiving position-error-servo signal from the PES read sensor, a write head for magnetizing nanoparticles attached to antigens, and a read sensor for detecting the nanoparticle-labeled antigens. The circuit may further comprise an X-axis actuator for controlling the head module in the direction perpendicular to the track and an Y-axis actuator coupled to the head module and the X-axis actuator for controlling the head module in the direction of the track. Target antigens are attached to the biosample track and nanoparticles via antibodies.

Abstract: A circuit for controlling an electromagnetic head module to detect antigens on a biosample track comprising a processor for receiving position-error-servo signal from the PES read sensor, a write head for magnetizing nanoparticles attached to antigens, and a read sensor for detecting the nanoparticle-labeled antigens. The circuit may further comprise an X-axis actuator for controlling the head module in the direction perpendicular to the track and an Y-axis actuator coupled to the head module and the X-axis actuator for controlling the head module in the direction of the track. Target antigens are attached to the biosample track and nanoparticles via antibodies.

Abstract: Embodiments of the invention relate to magnetizing and detecting nanoparticle-labeled antigens on biosample tracks deposited on a tape media. An aspect of the invention comprises apparatus and methods for labeling antigens with demagnetized nanoparticles, magnetizing the nanoparticles with an electromagnetic write head, and detecting the antigens via the magnetized nanoparticles by reading the tape media with a read sensor in a read-after-write operation. The write head and read sensor are part of a head-module of magnetic tape drive. Target antigens are attached to the biosample tracks by antibodies. Nanoparticles of differing magnetic properties may be selectively paired with antibodies associated with different antigens to allow multiple antigens to be detected upon a single scan by the read sensor.