We investigated the dependence of CoFe composition on the magnetoresistance and thermal stability behavior of the CoNbZr-based SV. CoNbZr/Co 80Fe20/Cu/Co80Fe20/IrMn/CoNbZr stacks were sputter-deposited on Si/SiO2 substrates. A comparison was also made with CoNbZr-based SV using a Co90Fe10 ferromagnet. MR ratio, exchange bias field (Hex) and Δρof a CoNbZr/Co80Fe20 SV increased up to about 51% (3.5% →5.6%), 52% (280 Oe→348 Oe) and 19% (0.5 μΩcm→0.59 μΩ cm), respectively. The MR ratio of the CoNbZr/Co80Fe 20 SV was enhanced because of higher spin polarization of the Co 80Fe20 than that of the Co90Fe10. When the samples were annealed at 300°C for 10 min, MR ratio and H ex of CoNbZr/Co80Fe20 SV increased about 48% (from 5.6% to 8.1%) and 52% (from 346 Oe to 536 Oe), respectively. According to the AES depth profile, Mn diffused outward direction (surface) predominantly in the CoNbZr/Co80Fe20 SV and to form Mn-oxides.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics