TY - JOUR
T1 - Control of grain density in FePt-C granular thin films during initial growth
AU - Suzuki, Ippei
AU - Wang, Jian
AU - Takahashi, Yukiko K.
AU - Hono, Kazuhiro
N1 - Funding Information:
This work was supported in part by IDEMA- ASTC and JSPS KAKENHI Grant-in-Aid (A) (Grant No. 18H03787). Appendix A
Funding Information:
This work was supported in part by IDEMA-ASTC and JSPS KAKENHI Grant-in-Aid (A) (Grant No. 18H03787).
Publisher Copyright:
© 2020
PY - 2020/4/15
Y1 - 2020/4/15
N2 - Herein, we report a systematic study on the microstructure evolution of FePt-C granular films grown on MgO(0 0 1) single-crystalline substrates, especially during the initial growth stage. The number density of the grains during the nucleation stage is strongly affected by the growth temperature, reaching 40 Tgrain/in2 at <200 °C and decreasing with further increasing temperature. The addition of carbon (C) as a segregant substantially reduced the density. Despite the high number density during the nucleation stage, the density was dramatically reduced with subsequent growth of the FePt-C film. The possible reason for the reduction in the grain density is the surface diffusion of the C added to enhance grain separation. Controlling the growth conditions rather than the nucleation stage is key to increasing the areal density of FePt-C granular films to develop heat-assisted magnetic recording media.
AB - Herein, we report a systematic study on the microstructure evolution of FePt-C granular films grown on MgO(0 0 1) single-crystalline substrates, especially during the initial growth stage. The number density of the grains during the nucleation stage is strongly affected by the growth temperature, reaching 40 Tgrain/in2 at <200 °C and decreasing with further increasing temperature. The addition of carbon (C) as a segregant substantially reduced the density. Despite the high number density during the nucleation stage, the density was dramatically reduced with subsequent growth of the FePt-C film. The possible reason for the reduction in the grain density is the surface diffusion of the C added to enhance grain separation. Controlling the growth conditions rather than the nucleation stage is key to increasing the areal density of FePt-C granular films to develop heat-assisted magnetic recording media.
KW - FePt
KW - Grain density
KW - Granular films
KW - Magnetic recording
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U2 - 10.1016/j.jmmm.2020.166418
DO - 10.1016/j.jmmm.2020.166418
M3 - Article
AN - SCOPUS:85077756839
SN - 0304-8853
VL - 500
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
M1 - 166418
ER -