[Ni80Fe20/Cu]n multilayers were fabricated onto n-Si(111) substrates by double pulse potentiostatic electrodeposition from single bath. The typical cross-sectional image of multilayer was ovserved by SEM

and the superlattice structure was characterized by high-angle X-ray diffraction. The giant magnetoresistance (GMR) properties of multilayers were investigated by four-probe technique. The results indicated that

with the increase of Cu layer thickness

GMR value showed a periodical oscillation tendency

while increasing the thickness of NiFe layers

GMR value decreased after achieving its maximum. The room-temperature GMR value was up to 6.4% for [NiFe(1.6nm)/Cu(2.6nm)]80

and the minimum saturation field is only 750Oe. Hysteresis loops revealed that the anti-ferromagnetic coupled multilayers with small squareness ratio were suitable for magnetic head materials.