Annealing temperature dependence of microwave permeability in CoFe/MnIr bilayers

Dong Young Kim, B. Parvatheeswara Rao, Chong Oh Kim, Masakiyo Tsunoda, Migaku Takahashi

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


We measured microwave permeability in thermal annealed CoFe/MnIr bilayers. The ferromagnetic resonance frequency (fFMR) and Gilbert damping constant (αG) are analyzed using the Landau-Lifshitz-Gilbert equation. The fFMR increases with the exchange bias field, and it can be easily tuned over 10 GHz either by controlling the CoFe thickness or through modifications of unidirectional anisotropy by thermal annealing. The extracted αG is inversely proportional to the exchange bias field, and this behavior is caused by the suppression of the anisotropy field distribution due to an increase in the exchange bias field. Thus, low loss performance in microwave frequency range can be achieved in exchange biased CoFe/MnIr bilayers.

Original languageEnglish
Pages (from-to)4388-4391
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number12
Publication statusPublished - 2007
EventInternational Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007) - Jeju, Korea, Republic of
Duration: 2007 May 282007 Jun 1


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