Origins of switching field distributions in perpendicular magnetic nanodot arrays

Justin M. Shaw, William H. Rippard, Stephen E. Russek, Timothy Reith, Charles M Falco

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Abstract

We studied the reversal properties of perpendicularly magnetized CoPd nanodots from 100 to 50 nm in diameter fabricated using electron beam lithography. Polycrystalline CoPd multilayers show considerable differences in the switching field distribution (SFD) depending on the seed layer used. With a Ta seed layer, we reduced the SFD to approximately 5% of the average switching field. To rule out effects of grain boundaries, we also fabricated nanodot arrays from epitaxial CoPd superlattices. Although significant improvement in SFDs are obtained using epitaxial superlattices, our results indicate that grain boundary variation within nanodots is not the primary origin of SFD broadening that occurs with nanopatterning.

Original languageEnglish (US)
Article number023909
JournalJournal of Applied Physics
Volume101
Issue number2
DOIs
Publication statusPublished - 2007

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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