Drastic change of giant magnetoresistance of Co/Cu multilayer by decreasing residual impurities in sputtering atmosphere

Satoshi Miura, Masakiyo Tsunoda, Toshiya Nagatsuka, Satoshi Sugano, Migaku Takahashi

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8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)4463-4465
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II A
Publication statusPublished - 1999 Apr 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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