An apparatus includes a magnetic apparatus that defines an actuation volume that is large enough to accommodate a sample, the magnetic apparatus including a magnet that is configured to create a magnetic field having a magnitude B in the sample when supplied with a DC current； at least one biological construct within the sample, the biological construct configured to change its status in response to a change in a property； and at least one magnetocaloric actuator coupled with the biological construct. A change in a characteristic in the actuation volume causes the property of the magnetocaloric actuator to change, which causes a change in the status of the biological construct.
