Sensitivity amplification techniques for magnetochemical sensors

A system for detecting magnetic particles, the system comprising:

• a detection device, comprising:
• a fluid region;
• a magnetochemical sensor configured to detect magnetic particles in the fluid region, the magnetochemical sensor having a sensing region;
• and
• a conductive structure configured to conduct current in a direction substantially perpendicular to an in-plane sensing axis of the magnetochemical sensor to generate a magnetic field gradient at the sensing region that directs magnetic particles in the fluid region toward the sensing region of the magnetochemical sensor.

A system for detecting magnetic particles, the system comprising:

• a detection device, comprising:
• a fluid region;
• a magnetochemical sensor configured to detect magnetic particles in the fluid region, the magnetochemical sensor having a sensing region;
• and
• a conductive structure configured to conduct current to generate a magnetic field gradient at the sensing region that directs magnetic particles in the fluid region toward the sensing region of the magnetochemical sensor,
• wherein a direction of current flow through the conductive structure is oriented relative to a sensing axis of the magnetochemical sensor to control alignment of the magnetic field gradient with the sensing region.