Magnetic exchange bias enhancement through seed layer variation in FeMn/NiFe layered structures

Lance Ritchie, Xiaoyong Liu, Snorri Ingvarsson, Gang Xiao, Jun Du, John Q. Xiao

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The exchange bias and crystalline texture of the multilayer structure (Ta/Al/seed/Fe50Mn50/Ni81Fe19/Al 2O3/Ni81Fe19/Al/Ta with seed = Ni81Fe19 or Ni81Fe19/Cu) has been characterized. Measurements indicate an abrupt decrease in exchange bias of the Ni81Fe19 pinned layer for samples with very thin seed layers, and exchange bias as high as 325 Oe for thicker seed layers. Fluctuation of exchange bias with thickness was greatly reduced for the Ni81Fe19/Cu seed configuration. X-ray diffraction measurements demonstrate a correlation between exchange bias and strong (1 1 1) texture of FeMn. The results suggest a high sensitivity of Ni81Fe19 roughness and texture on deposition conditions, and corroborate previous observations of roughness in ultrathin NiFe films.

Original languageEnglish
Pages (from-to)187-190
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume247
Issue number2
DOIs
Publication statusPublished - Jun 2002

Bibliographical note

Funding Information:
This work was supported by National Science Foundation Grant No. DMR-0071770.

Other keywords

  • Exchange anisotropy
  • FeMn
  • NiFe

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