Development of current perpendicular to plane differential dual spin valve for ultrahigh resolution

G. C. Han, C. C. Wang, J. J. Qiu, P. Luo, V. Ko, Z. B. Guo, B. Y. Zong, L. H. An

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Recently, a differential dual spin valve (DDSV) has been proposed to enhance the downtrack resolution for the application in the hard disk drive recording at 10 Tb/in2 and beyond. The following key issues for the implementation of a high-quality DDSV have been addressed. I. Formation of the antiparallel arrangement of the reference magnetization of two spin valves (SVs) with high pinning stability. II. Differential effect of a DDSV. To achieve perfect differential effect in a DDSV, not only should two SVs have the same giant magnetoresistance effect, but their free-layer (FL) magnetization should also respond to a field identically. Using 2.4 nm ruthenium as the gap layer to form a ferromagnetic interlayer coupling between FLs, a good differential effect is achieved. III. Quasistatic characterization of a DDSV. As there is no output from a DDSV under a uniform field, it would be difficult to evaluate performances of a DDSV. By varying the annealing field direction, field response of each SV as well as differential effect can be identified.

Original languageEnglish (US)
Article number07B707
JournalJournal of Applied Physics
Issue number7
StatePublished - Apr 1 2011

ASJC Scopus subject areas

  • General Physics and Astronomy


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