Magnetoresistance of antiferromagnet CoFe/Ru/CoFe/IrMn top spin valve with thermal stability

Magnetoresistance of antiferromagnet CoFe/Ru/CoFe/IrMn top spin valve with thermal stability

Thermal stability and magnetoresistive properties of synthetic antiferromagnet spin valves (SAF/SV) having the Ta20/NiFe20/CoFe20/Cu22/CoFe25/Ru5/CoFe22/IrMn40/Ta20 (in Å) structure were investigated. The SAF/SV annealed for a 1 h at 200°C exhibits a magnetoresistance (MR) ratio of 8.8%, an effectiv...

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Veröffentlicht in:Journal of magnetism and magnetic materials 2004-05, Vol.272, p.1875-1876
Hauptverfasser: Hwang, J.Y., Kim, M.Y., Rhee, J.R., Lee, S.S., Hwang, D.G., Yu, S.C., Lee, H.B.
Format: Artikel
Sprache:eng
Schlagworte:
Annealing cycle
Effective exchange coupling field ( Heex)
MR ratio
Saturation field ( Hs)
Synthetic antiferromagnet
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Zusammenfassung:Thermal stability and magnetoresistive properties of synthetic antiferromagnet spin valves (SAF/SV) having the Ta20/NiFe20/CoFe20/Cu22/CoFe25/Ru5/CoFe22/IrMn40/Ta20 (in Å) structure were investigated. The SAF/SV annealed for a 1 h at 200°C exhibits a magnetoresistance (MR) ratio of 8.8%, an effective exchange coupling field ( H eex) of 1170 Oe, and an antiferromagnetic (AF) saturation field ( H s) of 5200 Oe at room temperature. H eex varies in approximately a 1/ t AP2 ( t AP2 is the thickness of CoFe layer adjacent to antiferromagnet layer). H eex and MR ratio are stabilized after the first annealing cycle, and it is thought that this SAF/SV reveals higher thermal stability.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2003.12.523