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

Yukio Nozaki; Ayumu Kato; Kenji Noda; Yasushi Kanai; Terumitsu Tanaka; Kimihide Matsuyama

doi:10.1063/1.3596805

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

Yukio Nozaki, Ayumu Kato, Kenji Noda, Yasushi Kanai, Terumitsu Tanaka, Kimihide Matsuyama

Electronic Devices

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

13 Citations (Scopus)

Abstract

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.

Original language	English
Article number	123912
Journal	Journal of Applied Physics
Volume	109
Issue number	12
DOIs	https://doi.org/10.1063/1.3596805
Publication status	Published - Jun 15 2011

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Access to Document

10.1063/1.3596805

Cite this

@article{6ef553fca6ef418ea1d132e91352932c,

title = "Micromagnetic study on microwave-assisted magnetic recording in perpendicular medium with intergrain exchange coupling",

abstract = "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.",

author = "Yukio Nozaki and Ayumu Kato and Kenji Noda and Yasushi Kanai and Terumitsu Tanaka and Kimihide Matsuyama",

note = "Funding Information: This research was partially supported by the Storage Research Consortium (SRC), JST-CREST, and Grant-in-Aid for Young Scientists (A), Grant No. 20686025, 2008, from the Ministry of Education, Culture, Sports, Science and Technology, Japan.",

year = "2011",

month = jun,

day = "15",

doi = "10.1063/1.3596805",

language = "English",

volume = "109",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

number = "12",

}

TY - JOUR

T1 - Micromagnetic study on microwave-assisted magnetic recording in perpendicular medium with intergrain exchange coupling

AU - Nozaki, Yukio

AU - Kato, Ayumu

AU - Noda, Kenji

AU - Kanai, Yasushi

AU - Tanaka, Terumitsu

AU - Matsuyama, Kimihide

N1 - Funding Information: This research was partially supported by the Storage Research Consortium (SRC), JST-CREST, and Grant-in-Aid for Young Scientists (A), Grant No. 20686025, 2008, from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

PY - 2011/6/15

Y1 - 2011/6/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=79960182934&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79960182934&partnerID=8YFLogxK

U2 - 10.1063/1.3596805

DO - 10.1063/1.3596805

M3 - Article

AN - SCOPUS:79960182934

SN - 0021-8979

VL - 109

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 12

M1 - 123912

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this