Study of spin valves with L10-FePt pinning layer and different pinned layers

Hui Zhao, Xuan Li, Zongzhi Zhang, Bin Ma, Q. Y. Jin

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

L10 FePt pinned spin valves (SVs) with different pinning/pinned layers: FePt/CoFe, FePt/Ru/CoFe, and FePt/CoFe/Ru/CoFe, were fabricated and investigated. Samples with rigidly ferromagnetic coupled bilayer of FePt (6.0 nm)/CoFe (4.0 nm) show giant magnetore-sistance (GMR) ratio up to 7.06%, which is similar to that in the conventional Mnlr-based SVs. Whereas the free layer coercivity (Hcf) of CoFe (3.0 nm)/NiFe (4.0 nm) is as high as 45 Oe. This is mainly due to the exchange coupling between the free layer and (111) textured FePt layer. Synthetic antiferromagntic structures, FePt/Ru/CoFe and FePt/CoFe/Ru/CoFe, were proved to be very effective in reducing the H cf value by forming a closed flux pathway in the bottom electrode. Compared with FePt/Ru/CoFe SVs, the FePt/CoFe/Ru/CoFe ones show higher pinned layer switching field. The optimized SV structure in this study is glass/FePt (6.0)/CoFe (2.0)/Ru (0.8)/CoFe (2.5)/Cu (2.4)/CoFe (3.0)/NiFe (4.0)/Pt (2.0) (in unit of nm), which exhibits a GMR ratio of 7.04%, a free layer Hcf of 22 Oe, and a pinned layer switching field of 1824 Oe.

Original languageEnglish (US)
Pages (from-to)2839-2841
Number of pages3
JournalIEEE Transactions on Magnetics
Volume43
Issue number6
DOIs
StatePublished - Jun 1 2007

Keywords

  • Giant magnetoresistance
  • L1 FePt
  • Spin valve
  • Synthetic antiferromagntic coupling

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