Presentation 2012-07-20
Characterization of Co-based Granular Perpendicular Media Using Ferromagnetic Resonance
Shintaro HINATA, Shin SAITO, Daiji HASEGAWA, Migaku TAKAHASHI,
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Abstract(in English) 3 kinds of characterization method of Co-based perpendicular media using Q-band (~34 GHz) Ferromagnetic resonance (FMR) were introduced: 1) Quantitative evaluation of H_k and g-factor for Co-based alloy films: dynamic magnetic properties simultaneously derived for CoPtCr film using resonance fields of FMR. g-factor increases from 2.11 to 2.19 when Co content decreases from 85 to 65 at.%. 2) Evaluation of magnitude of the interlayer exchange in the stacked media (media consists of continuous film layer/ interlayer/ granular layer): magnitude of interlayer exchange coupling J_ was analyzed by fitting experimentally obtained resonance fields with the LLG equation. Jinter increases from 0.55 to 1.83 erg/cm^2 with decreasing Pt-interlayer thickness from 2 to 1 nm. 3) Evaluation of the intergranular exchange coupling field H_ for the granular media: the intergranular exchange coupling field H_ was derived from resonance fields of granular media with multidomain state. H_/H_k was evaluated to be 0.09 for well magnetically isolated media.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Ferromagnetic resonance / Q-band / perpendicular media / interlayer exchange coupling / intergranular exchange coupling field
Paper # MR2012-17
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Committee MR
Conference Date 2012/7/12(1days)
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Registration To Magnetic Recording (MR)
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Characterization of Co-based Granular Perpendicular Media Using Ferromagnetic Resonance
Sub Title (in English)
Keyword(1) Ferromagnetic resonance
Keyword(2) Q-band
Keyword(3) perpendicular media
Keyword(4) interlayer exchange coupling
Keyword(5) intergranular exchange coupling field
1st Author's Name Shintaro HINATA
1st Author's Affiliation Department of Electronic Engineering, Graduate School of Engineering, Tohoku University()
2nd Author's Name Shin SAITO
2nd Author's Affiliation Department of Electronic Engineering, Graduate School of Engineering, Tohoku University
3rd Author's Name Daiji HASEGAWA
3rd Author's Affiliation Waseda Institute for Advanced Study, Waseda University
4th Author's Name Migaku TAKAHASHI
4th Author's Affiliation New Industry Creation Hatchery Center (NICHe), Tohoku University
Date 2012-07-20
Paper # MR2012-17
Volume (vol) vol.112
Number (no) 137
Page pp.pp.-
#Pages 6
Date of Issue