Micromagnetic study on microwave-assisted magnetic recording in perpendicular medium with intergrain exchange coupling

Micromagnetic study on microwave-assisted magnetic recording in perpendicular medium with intergrain exchange coupling

The influence of intergrain exchange coupling on the properties of microwave-assisted magnetization reversal has been investigated. The results of micromagnetic simulation suggest that the microwave frequency realizing the magnetization reversal is increased as the exchange stiffness constant among...

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Veröffentlicht in:Journal of applied physics 2011-06, Vol.109 (12), p.123912-123912-6
Hauptverfasser: Nozaki, Yukio, Kato, Ayumu, Noda, Kenji, Kanai, Yasushi, Tanaka, Terumitsu, Matsuyama, Kimihide
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container_end_page 123912-6
container_issue 12
container_start_page 123912
container_title Journal of applied physics
container_volume 109
creator Nozaki, Yukio
Kato, Ayumu
Noda, Kenji
Kanai, Yasushi
Tanaka, Terumitsu
Matsuyama, Kimihide
description The influence of intergrain exchange coupling on the properties of microwave-assisted magnetization reversal has been investigated. The results of micromagnetic simulation suggest that the microwave frequency realizing the magnetization reversal is increased as the exchange stiffness constant among the magnetic grains becomes larger than 1×10 −7 erg/cm if an inhomogeneous magnetization reversal occurred. The numerically expected increase in the microwave frequency was observed experimentally in perpendicularly magnetized Co/Pd multilayer with an exchange stiffness constant of ∼1×10 −6 erg/cm. The simulations of signal recording and reproducing processes in a granular medium with assistance of a microwave field also suggest that an adequate intergrain exchange coupling is required to inhibit the nucleation of small island domains that will suppress the amplitude of the signal-noise ratio of the readback signal.
doi_str_mv 10.1063/1.3596805
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title Micromagnetic study on microwave-assisted magnetic recording in perpendicular medium with intergrain exchange coupling
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