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Title: Nanogranular L1 0 FePt-C-Ta 2O 5 composite media for perpendicular recording applications
Authors: Cher, K.M.
Lim, B.C.
Hu, J.F.
Lwin, P.W.
Zhou, T.J.
Chen, J.S. 
Keywords: Dopant
Grain isolation
Perpendicular media
Issue Date: Mar-2011
Citation: Cher, K.M., Lim, B.C., Hu, J.F., Lwin, P.W., Zhou, T.J., Chen, J.S. (2011-03). Nanogranular L1 0 FePt-C-Ta 2O 5 composite media for perpendicular recording applications. Journal of Nanoscience and Nanotechnology 11 (3) : 2588-2592. ScholarBank@NUS Repository.
Abstract: In this report, the effect of simultaneously adding two dopants (C and Ta 2O 5) in FePt was investigated. (Fe 55Pt 45) 79C 21-(x vol%) Ta 2O 5 films (where x = 0% to 20%) were prepared using both low and high power magnetron sputtering on MgO (2 nm)/CrRu (30 nm) underlayers with in-situ heating at 350 °C. Films deposited at low power showed a dercrease in exchange coupling with increasing Ta 2O 5 content. Out-of-plane coercivity of 7.2 kOe was observed even with up to 20 vol% Ta 2O 5. X-Ray diffraction spectra showed presence of FePt(001) texture for all compositions of Ta 2O 5 ranging from 0 to 20 vol% suggesting tha t the per pendicular anisotropy was maintained even with up to 20 vol% of dopant content. Films deposited at high power showed a different behavior with an initial increase in out-of-plane coercivity to 8.2 kOe and a reduction in exchange coupling with loop slope parameter (α) approaching a fully decoupled value of 1. Further increase in doping content led to deterioration in the out-of-plane coercivity, as well as an increase in the exchange coupling. © 2011 American Scientific Publishers.
Source Title: Journal of Nanoscience and Nanotechnology
ISSN: 15334880
DOI: 10.1166/jnn.2011.2695
Appears in Collections:Staff Publications

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