Frequency modulation effect on microwave assisted magnetization switching

S. Okamoto; N. Kikuchi; O. Kitakami

doi:10.1063/1.2996573

Frequency modulation effect on microwave assisted magnetization switching

S. Okamoto, N. Kikuchi, O. Kitakami

IMRAM - Division of Inorganic Material Research

Tohoku University

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

Frequency modulation (FM) effect on the microwave assisted switching (MAS) of magnetization has been studied by calculating the Landau-Lifshitz-Gilbert equation. Application of FM microwave can significantly reduce the switching field compared with constant frequency wave, mainly due to more effective microwave energy absorption by the spin system. The FM effect on the MAS is remarkable especially for smaller Gilbert damping of α≤0.02. For sufficient switching probability, the FM-MAS requires somewhat longer time of a few nanoseconds for the dc magnetic field parallel to the easy axis. The tilt dc field can effectively reduce the switching time.

Original language	English
Article number	142501
Journal	Applied Physics Letters
Volume	93
Issue number	14
DOIs	https://doi.org/10.1063/1.2996573
Publication status	Published - 2008

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10.1063/1.2996573

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title = "Frequency modulation effect on microwave assisted magnetization switching",

abstract = "Frequency modulation (FM) effect on the microwave assisted switching (MAS) of magnetization has been studied by calculating the Landau-Lifshitz-Gilbert equation. Application of FM microwave can significantly reduce the switching field compared with constant frequency wave, mainly due to more effective microwave energy absorption by the spin system. The FM effect on the MAS is remarkable especially for smaller Gilbert damping of α≤0.02. For sufficient switching probability, the FM-MAS requires somewhat longer time of a few nanoseconds for the dc magnetic field parallel to the easy axis. The tilt dc field can effectively reduce the switching time.",

author = "S. Okamoto and N. Kikuchi and O. Kitakami",

note = "Funding Information: This work was partially supported by the “Research and Development for Next-Generation Information Technology of MEXT” and Grant-in-Aid for Scientific Research from MEXT, the Strategic Information and Communications R&D Promotion Program (SCOPE) by the Ministry of Internal Affairs, and the Storage Research Consortium in Japan.",

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AU - Okamoto, S.

AU - Kikuchi, N.

AU - Kitakami, O.

N1 - Funding Information: This work was partially supported by the “Research and Development for Next-Generation Information Technology of MEXT” and Grant-in-Aid for Scientific Research from MEXT, the Strategic Information and Communications R&D Promotion Program (SCOPE) by the Ministry of Internal Affairs, and the Storage Research Consortium in Japan.

PY - 2008

Y1 - 2008

N2 - Frequency modulation (FM) effect on the microwave assisted switching (MAS) of magnetization has been studied by calculating the Landau-Lifshitz-Gilbert equation. Application of FM microwave can significantly reduce the switching field compared with constant frequency wave, mainly due to more effective microwave energy absorption by the spin system. The FM effect on the MAS is remarkable especially for smaller Gilbert damping of α≤0.02. For sufficient switching probability, the FM-MAS requires somewhat longer time of a few nanoseconds for the dc magnetic field parallel to the easy axis. The tilt dc field can effectively reduce the switching time.

AB - Frequency modulation (FM) effect on the microwave assisted switching (MAS) of magnetization has been studied by calculating the Landau-Lifshitz-Gilbert equation. Application of FM microwave can significantly reduce the switching field compared with constant frequency wave, mainly due to more effective microwave energy absorption by the spin system. The FM effect on the MAS is remarkable especially for smaller Gilbert damping of α≤0.02. For sufficient switching probability, the FM-MAS requires somewhat longer time of a few nanoseconds for the dc magnetic field parallel to the easy axis. The tilt dc field can effectively reduce the switching time.

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Frequency modulation effect on microwave assisted magnetization switching

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