In order to clarify the influence of residual impurities in the sputtering atmosphere on the microstructure and the giant magnetoresistance (GMR), Co/Cu multilayers were fabricated by changing the chamber pressures, Pb, just before introducing processing gas. Pb was controlled by changing the pumping time after venting the chamber with air. A drastic change of magneto resistance (MR) ratio from 48% to 14% was observed, when Pb was changed slightly from 7 × 10-8 to 3 × 10-8 Torr. In that Pb, region, the root mean square (rms) roughness increased discontinuously from 3.7 to 4.6 Å as Pb was lowered. The abrupt drop of the MR ratio was accounted for by the decrease of the antiferromagnetic coupling accompanied by the increase of interfacial roughness.
|Number of pages||3|
|Journal||Journal of Applied Physics|
|Issue number||8 II A|
|Publication status||Published - 1999 Apr 15|
ASJC Scopus subject areas
- Physics and Astronomy(all)