Particle movement in channel responsive to magnetic field

A method of measuring one or more particles that move in response to a magnetic stimulus, the method comprising:

• providing a channel comprising a fluid and one or more particles in the fluid, wherein the one or more particles move along a defined path of the channel in response to an applied magnetic field;
• and
• generating a measurement related to the one or more particles based on an output of a sensor that is integrated with the channel.

A system with particle movement in response to a magnetic stimulus, the system comprising:

• a channel comprising a fluid and at least one particle in the fluid;
• and
• a magnetic structure integrated with the channel, the magnetic structure comprising a meander shape, and the magnetic structure configured to apply a gradient magnetic field to cause the at least one particle to move in the channel.