A heat sink has a heat spreader structure containing magneto-hydrodynamic fluid. Also, the heat spreader includes a central metallic cylinder and a metal ring screen surrounding the central metallic cylinder. Electrical and magnetic fields induce the magneto-hydrodynamic fluid to undergo a swirling motion. The swirling motion acts as an MHD pump and provides efficient heat dissipation from a heat source contacting the heat spreader. A heat sink spreader has a central metallic cylinder surrounded by a metallic ring screen, and a magneto-hydrodynamic fluid. A method of cooling the heat sink spreader includes electrically charging the central metallic cylinder and oppositely electrically charging the metallic ring screen to create an electric potential between the central metallic cylinder and the metallic ring screen; creating a magnetic field inside the heat sink spreader; and swirling the magneto-hydrodynamic fluid to cool a heat source, wherein the swirling motion is induced by the electric potential and the magnetic fields.