Ru Alloy-Oxide Buffer Layer for Intergranular Exchange Decoupling of CoPt-B2O3 Granular Media

Investigation of magnetic properties and microstructure for the Co 80 Pt 20 -30vol% B 2 O 3 granular medium to clarify the effect of utilizing buffer layer (BL) on intergranular exchange coupling was conducted. It was found that the employment of a Ru 50 Co 25 Cr 25 -30vol% TiO 2 BL with thickness o...

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Veröffentlicht in:	IEEE transactions on magnetics 2018-02, Vol.54 (2), p.1-4
Hauptverfasser:	Kim Kong Tham, Kushibiki, Ryosuke, Kamada, Tomonari, Hinata, Shintaro, Saito, Shin
Format:	Artikel
Sprache:	eng
Schlagworte:	Amorphous magnetic materials Boron oxides Buffer layers CoPt–B₂O₃ granular media Coupling Decoupling Exchanging Grains Granular materials Granular media high Hc intergranular exchange coupling Magnetic properties Magnetic separation Magnetic tape Magnetism Media Perpendicular magnetic anisotropy Perpendicular magnetic recording RuCoCr–TiO₂ buffer layer (BL) Ruthenium base alloys Titanium dioxide
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Beschreibung
Zusammenfassung:	Investigation of magnetic properties and microstructure for the Co 80 Pt 20 -30vol% B 2 O 3 granular medium to clarify the effect of utilizing buffer layer (BL) on intergranular exchange coupling was conducted. It was found that the employment of a Ru 50 Co 25 Cr 25 -30vol% TiO 2 BL with thickness of around 2 nm will avoid physical contact between magnetic grains in the initial growth region, which is effective to intergranular exchange decouple the magnetic grains. On the other hand, for deposition of BL thicker than 2 nm, underlayer will be flatten that brings the possibility of physical contact of magnetic grains and forms a granular film with strong intergranular exchange coupling.
ISSN:	0018-9464 1941-0069
DOI:	10.1109/TMAG.2017.2749433