TY - JOUR
T1 - Proposal of Granular-Type Cap Layer with High-Ku CoPt Grains and Ferromagnetic Oxide Grain Boundaries for Full Granular Media
AU - Tham, Kim Kong
AU - Kushibiki, Ryosuke
AU - Kamada, Tomonari
AU - Saito, Shin
N1 - Publisher Copyright:
© 1965-2012 IEEE.
PY - 2019/7
Y1 - 2019/7
N2 - Investigation of magnetic properties and microstructure for the stacked media with Co80Pt20-30 vol% rare earth (RE) oxide (RE oxide: Gd2O3, Nd2O3, and Sm2O3) cap layers (CLs) deposited on a Co80Pt20-30 vol% B2O3 granular recording layer (GRL) was conducted. It was found that the employment of a granular-type CL with ferromagnetic oxide is effective to control intergranular exchange coupling of the magnetic grains in CoPt-B2O3 GRL while maintaining the granular structure of the CL. In this full granular media, continuous structure of columnar magnetic grains and grain boundaries from the GRL up to the CL can be observed. When a typical ferromagnetic oxide CL, such as CoPt-Gd2O3 (9 nm), is deposited on CoPt-B2O3 GRL (16 nm), the nucleation field is increased from 0.7 to 1.1 kOe, and the saturation field is reduced from 21.5 to 16 kOe which suggest that CoPt-RE oxide is promising for a CL.
AB - Investigation of magnetic properties and microstructure for the stacked media with Co80Pt20-30 vol% rare earth (RE) oxide (RE oxide: Gd2O3, Nd2O3, and Sm2O3) cap layers (CLs) deposited on a Co80Pt20-30 vol% B2O3 granular recording layer (GRL) was conducted. It was found that the employment of a granular-type CL with ferromagnetic oxide is effective to control intergranular exchange coupling of the magnetic grains in CoPt-B2O3 GRL while maintaining the granular structure of the CL. In this full granular media, continuous structure of columnar magnetic grains and grain boundaries from the GRL up to the CL can be observed. When a typical ferromagnetic oxide CL, such as CoPt-Gd2O3 (9 nm), is deposited on CoPt-B2O3 GRL (16 nm), the nucleation field is increased from 0.7 to 1.1 kOe, and the saturation field is reduced from 21.5 to 16 kOe which suggest that CoPt-RE oxide is promising for a CL.
KW - CoPt-BO
KW - ferromagnetic oxide
KW - full granular media
KW - granular cap layer (CL)
KW - high K
KW - rare earth (RE) oxide
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U2 - 10.1109/TMAG.2019.2893257
DO - 10.1109/TMAG.2019.2893257
M3 - Article
AN - SCOPUS:85067828060
VL - 55
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 7
M1 - 8640849
ER -