Localized magnetic modification of permalloy using Cr+ ion implantation

L. Folks, R. E. Fontana, B. A. Gurney, J. R. Childress, S. Maat, J. A. Katine, J. E.E. Baglin, A. J. Kellock

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Doping ferromagnetic nickel-iron alloys with chromium causes the Curie temperature to be reduced. We have demonstrated that solid state solutions of Ni-Fe-Cr can be formed by implanting Cr ions into ferromagnetic NiFe alloy films, thus creating paramagnetic films. We find that the magnetic moment and coercivity decrease steadily with Cr+ dose, reaching zero at room temperature with the onset of paramagnetism. Using Cr+ implantation in conjunction with a lithographic mask we have patterned continuous Ni80Fe20 films into separate regions that are ferromagnetic and paramagnetic at room temperature. This magnetic patterning process may have applications for the manufacture of magnetic write heads, such as for the notching process used to constrain the stray field from the write gap.

Original languageEnglish (US)
Pages (from-to)2601-2604
Number of pages4
JournalJournal of Physics D: Applied Physics
Issue number21
StatePublished - Nov 7 2003
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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