Fabrication and Characterization of SmCo₅/Fe₆₅Co₃₅ and SmCo₅/Fe Composite Spring Exchange Magnets

SmCo₅/Fe₆₅Co₃₅ and SmCo₅/Fe spring exchange magnets are fabricated by dc magnetron sputtering on MgO substrates and 100-nm-thick Si₃N₄ membranes, respectively. The base pressure of sputtering chamber is kept below 10^-7 Torr, and Ar pressure is 3 to 8mTorr. The samples are characterized by an x-ray diffractometer, a superconducting quantum interference magnetometer, and high resolution magnetic soft x-ray microscopy. We obtain the complete exchange coupling and single phase behaviour of composite magnets. The (BH)_max value achieved is 28.8MGOe.