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http://dx.doi.org/10.4283/JKMS.2006.16.5.234

Exchange Coupling Effect on Microwave Permeability in CoFe/MnIr Bilayers  

Kim, Dong-Young (ReCAMM, Chungnam National University)
Kim, Chong-Oh (ReCAMM, Chungnam National University)
Kim, Cheol-Gi (ReCAMM, Chungnam National University)
Tsunoda, M. (Department of Electronic Engineering, Tohoku University)
Takahashi, M. (Department of Electronic Engineering, Tohoku University)
Publication Information
Journal of the Korean Magnetics Society / v.16, no.5, 2006 , pp. 234-239 More about this Journal
Abstract
We measured the microwave permeability in the frequency range of 100 MHz$\sim$9 GHz in the exchange biased CoFe/MnIr films. The results were analyzed based on the Landau-Lifshitz-Gilbert theory. The initial permeability and ferromagnetic resonance frequency was tuned by controlling the CoFe thickness and unidirectional anisotropy. The tunable range of ferromagnetic resonance frequency was up to 20 GHz in the thin CoFe layer of 1.5 nm. The CoFe/MnIr films showed the high permeability and low loss properties in the microwave frequency range. Thus, this material could be applied to the microwave devices.
Keywords
exchange bias; ferromagnetic resonance; permeability; unidirectional anisotropy;
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