Numerical study on microwave-assisted magnetization reversal of magnetic particles several tens of nanometers wide with perpendicular anisotropy

Yukio Nozaki, M. Ohta, N. Narita, K. Matsuyama

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Microwave-assisted magnetization reversal (MAMR) is numerically investigated for perpendicularly magnetized particles with a natural ferromagnetic resonance frequency of 22.5 GHz. The precession angle of magnetization can be enhanced intensively by increasing the amplitude of the ac hard-axis field with an optimum frequency. However, the precession of magnetization about the easy axis becomes unstable as the precession angle reaches a critical value because the easy-axis component of the effective field exerted on the magnetization becomes zero. The analysis of magnetization dynamics in MAMR showed that the precession of magnetization about an in-plane axis, appearing after the easy-axis component of the effective field becomes zero, plays an important role in the irreversible switching of magnetization.

Original languageEnglish
Article number07B901
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
Publication statusPublished - 2009
Externally publishedYes

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microwaves
magnetization
anisotropy
precession
ferromagnetic resonance

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Numerical study on microwave-assisted magnetization reversal of magnetic particles several tens of nanometers wide with perpendicular anisotropy. / Nozaki, Yukio; Ohta, M.; Narita, N.; Matsuyama, K.

In: Journal of Applied Physics, Vol. 105, No. 7, 07B901, 2009.

Research output: Contribution to journalArticle

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