STUDY ON MAGNETORESISTANCE AND STABILITY FOR [PY CU/CO/CU](N) SPIN-VALVE MULTILAYERED FILMS/

The spin valve [NiFe/Cu/Co/Cu] multilayers were prepared by using elec tron beam method. The influences of the thickness of magnetic and non- magnetic layers, preparation process on the magnetoresistance (MR) wer e studied. We also investigated the stability of MR and how to reduce the center field Ho, which is the center magnetic field of the linear region in the MR - H curve. Using fairly optimum preparing technology, we have deposited many samples with low center field Ho in the range 10 - 20 Oe, the MR merit is larger than 0.2%/Oe. The variation of the MR in this linear region is reversible during repeatedly magnetizing. The change of MR is smaller than 1% for several samples after aging on e year in a dry air chamber and room temperature.