Indirect exchange spring between FePt and Fe with a Ru interlayer

Jianhua Jiang, Nobuki Tezuka, K. Inomata

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Indirect exchange spring in magnetron-sputtered FePt/Ru/Fe trilayers as well as multilayers have been investigated. Interlayer exchange coupling between FePt and Fe layers through a Ru spacer was obtained with an oscillation period of about 1 nm. Magnetic properties of FePt thin films with different nominal thicknesses deposited on MgO (1 1 0) substrates at 400 °C showed that 12.5 nm thick FePt film had both high coercivity and good squareness. In FePt/Ru/Fe trilayers, ferromagnetic coupling between the two magnetic layers was achieved with a 0.5 nm thick Ru layer, and the saturated magnetization was largely improved after using interlayer exchange coupling with Fe while the coercivity changed little, which indicated that indirect exchange spring was a promising approach for high-performance magnets. Multilayers with such structures had also been studied with different thickness ratio of the two magnetic layers and strong exchange coupling was achieved as Fe thickness ratio increased.

Original languageEnglish
Pages (from-to)40-46
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Issue number1
Publication statusPublished - 2006 Jul 1


  • Exchange spring
  • FePt
  • Interlayer exchange coupling
  • Magnetization
  • Permanent magnet

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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