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Extraordinary magnetoresistance effect has been found in Ni/Co sputtered multilayers. Magnetoresistance values higher than 130% are achieved at room temperature with a saturation magnetic field of 35 Oe, using a particular arrangement of contacts. The large anisotropic magnetoresistance and the low coercivity of these samples are the origin of such an outstanding property. The results reported here seem to have promising applications in magnetoresistive devices.

Extraordinary magnetoresistance factors are reported in Co/Ni sputtered multilayers. Magnetic softness, large anisotropic magnetoresistance and a special contacts configuration give rise to magnetoresistance factors as large as 120% at room temperature and under an applied field of 40 Oe.