Annealing temperature dependence of microwave permeability in CoFe/MnIr bilayers

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

doi:10.1002/pssc.200777412

Annealing temperature dependence of microwave permeability in CoFe/MnIr bilayers

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

Research Center for Green X-Tech

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

We measured microwave permeability in thermal annealed CoFe/MnIr bilayers. The ferromagnetic resonance frequency (f_FMR) and Gilbert damping constant (α_G) are analyzed using the Landau-Lifshitz-Gilbert equation. The f_FMR 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 α_G 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 language	English
Pages (from-to)	4388-4391
Number of pages	4
Journal	Physica Status Solidi (C) Current Topics in Solid State Physics
Volume	4
Issue number	12
DOIs	https://doi.org/10.1002/pssc.200777412
Publication status	Published - 2007
Event	International Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007) - Jeju, Korea, Republic of Duration: 2007 May 28 → 2007 Jun 1

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title = "Annealing temperature dependence of microwave permeability in CoFe/MnIr bilayers",

abstract = "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.",

author = "Kim, {Dong Young} and {Parvatheeswara Rao}, B. and Kim, {Chong Oh} and Masakiyo Tsunoda and Migaku Takahashi",

year = "2007",

doi = "10.1002/pssc.200777412",

language = "English",

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pages = "4388--4391",

journal = "Physica Status Solidi (C) Current Topics in Solid State Physics",

issn = "1862-6351",

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number = "12",

note = "International Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007) ; Conference date: 28-05-2007 Through 01-06-2007",

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TY - JOUR

T1 - Annealing temperature dependence of microwave permeability in CoFe/MnIr bilayers

AU - Kim, Dong Young

AU - Parvatheeswara Rao, B.

AU - Kim, Chong Oh

AU - Tsunoda, Masakiyo

AU - Takahashi, Migaku

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

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DO - 10.1002/pssc.200777412

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EP - 4391

JO - Physica Status Solidi (C) Current Topics in Solid State Physics

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Y2 - 28 May 2007 through 1 June 2007

ER -

Annealing temperature dependence of microwave permeability in CoFe/MnIr bilayers

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