Parallel ferromagnetic resonance and spin-wave excitation in exchange-biased NiFe/IrMn bilayers

Marcos Antonio De Sousa, Fernando Pelegrini, Willian Alayo, Justiniano Quispe Marcatoma, Elisa Baggio-Saitovitch

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Ferromagnetic Resonance study of sputtered Ru(7 nm)/NiFe(t FM)/IrMn(6 nm)/Ru(5 nm) exchange-biased bilayers at X and Q-band microwave frequencies reveals the excitation of spin-wave and NiFe resonance modes. Angular variations of the in-plane resonance fields of spin-wave and NiFe resonance modes show the effect of the unidirectional anisotropy, which is about twice larger for the spin-wave mode due to spin pinning at the NiFe/IrMn interface. At Q-band frequency the angular variations of in-plane resonance fields also reveal the symmetry of a uniaxial anisotropy. A modified theoretical model which also includes the contribution of a rotatable anisotropy provides a good description of the experimental results.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalPhysica B: Condensed Matter
Volume450
DOIs
StatePublished - 1 Oct 2014
Externally publishedYes

Bibliographical note

Funding Information:
This work was partially supported by the Brazilian agencies CNPq (throughout the Projects 141830/2009-3 and 151440/2013-1 ), FAPERJ and CAPES.

Keywords

  • Anisotropy
  • Exchange bias
  • Ferromagnetic resonance
  • Magnetic bilayers
  • Spin pinning
  • Spin wave resonance

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