Microwave assistance effect on magnetization switching in Co-Cr-Pt granular film

Satoshi Okamoto; Nobuaki Kikuchi; Akira Hotta; Masaki Furuta; Osamu Kitakami; Takehito Shimatsu

doi:10.1063/1.4830364

Microwave assistance effect on magnetization switching in Co-Cr-Pt granular film

Satoshi Okamoto, Nobuaki Kikuchi, Akira Hotta, Masaki Furuta, Osamu Kitakami, Takehito Shimatsu

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

26 Citations (Scopus)

Abstract

Experimental verification of microwave assistance effect on a perpendicular magnetic CoCrPt based granular film is demonstrated. Significant reduction of coercivity under the assistance of a radio frequency (rf) field is clearly observed. But the coercivity strongly depends on the duration of rf field, indicating that the magnetic moments of constituent grains are severely perturbed by thermal agitation. Analysis based on the Néel-Arrhenius law has revealed that the dynamic coercivity in nanosecond region can be reduced by 50% only by applying a small rf field with the amplitude less than 2% of the anisotropy field.

Original language	English
Article number	202405
Journal	Applied Physics Letters
Volume	103
Issue number	20
DOIs	https://doi.org/10.1063/1.4830364
Publication status	Published - 2013 Nov 11

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "Experimental verification of microwave assistance effect on a perpendicular magnetic CoCrPt based granular film is demonstrated. Significant reduction of coercivity under the assistance of a radio frequency (rf) field is clearly observed. But the coercivity strongly depends on the duration of rf field, indicating that the magnetic moments of constituent grains are severely perturbed by thermal agitation. Analysis based on the N{\'e}el-Arrhenius law has revealed that the dynamic coercivity in nanosecond region can be reduced by 50% only by applying a small rf field with the amplitude less than 2% of the anisotropy field.",

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AU - Kitakami, Osamu

AU - Shimatsu, Takehito

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AB - Experimental verification of microwave assistance effect on a perpendicular magnetic CoCrPt based granular film is demonstrated. Significant reduction of coercivity under the assistance of a radio frequency (rf) field is clearly observed. But the coercivity strongly depends on the duration of rf field, indicating that the magnetic moments of constituent grains are severely perturbed by thermal agitation. Analysis based on the Néel-Arrhenius law has revealed that the dynamic coercivity in nanosecond region can be reduced by 50% only by applying a small rf field with the amplitude less than 2% of the anisotropy field.

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