A handheld device may include a magnetic convection cooling system, which may include a fluid chamber that is in thermal communication with electronic circuitry of the handheld device. The fluid chamber may be closed and may contain a substantially non- gaseous first fluid and a substantially non-gaseous second fluid, wherein first fluid may include a magnetic property different from a magnetic property of second fluid. At least one electromagnet may be selectively activated to move the first and second fluids within the fluid chamber to provide convective cooling of the electronic circuitry.