Control of the switching properties of magnetic thin films and spin valve devices by patterning

D. Morecroft, Chi Wah Leung, N. A. Stelmashenko, J. L. Prieto, D. B. Jardine, M. G. Blamire

Research output: Journal article publicationConference articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

The effects of patterning highly anisotropic repeating structures in soft magnetic thin films have been examined. Arrays of wires with equal mark/space ratios were patterned in resist using optical lithography. 100 nm thick Ni80Fe15Mo5films were partially or completely etched using broad beam ion milling to assess the dependence of magnetic properties on the degree of interconnection between the wires. These structures show a progressive increase in coercivity and a transition between single and two-stage switching with increasing milling depth. A similar nanopatterning technique has been applied to unpinned (Ni80Fe20/Cu/Ni80Fe20) spin valve structures in order to enhance the coercivity of one of the ferromagnetic layers; the increased coercivity induced by patterning changes the natural similarity of the magnetic layers and the completed structure exhibits a small spin valve response.
Original languageEnglish
Pages (from-to)2079-2081
Number of pages3
JournalIEEE Transactions on Magnetics
Volume37
Issue number4 I
DOIs
Publication statusPublished - 1 Jul 2001
Externally publishedYes
Event8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States
Duration: 7 Jan 200111 Jan 2001

Keywords

  • Anisotropy
  • Magnetic films
  • Magnetoresistive devices
  • Nanotechnology

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

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