Title: 鈷/鉑多層薄膜與鈷鉑合金膜之製備與性質研究
Fabrication and Properties of Co/Pt Multilayess and CoxPt1-x Alloy Films
Authors: 胡紀平
Hu, Ji-Ping
林鵬
Pang Lin
材料科學與工程學系
Keywords: 磁光記錄媒體;鈷/鉑多層薄膜;垂直異向性;鈷鉑合金膜;材料科學;物理;Magneto-Optic Recording Media;Co/Pt Multilayers;Perpendicular Anisotropy;CoPt Alloy Film;MATERIALS-SCIENCE;PHYSICS
Issue Date: 1996
Abstract: Co/Pt multilayers and alloy films with large perpendicular
anisotropy have been fabricated, and the correlations between
their magnetic/magneto-optic properties and microstructures were
investigated. A disk made of the CoPt alloy film was
characterized for the feasibi-lity as a media of magneto-optic
recording.Co/Pt multilayers were prepared by evaporation and
sputter methodswith dual-guns. The layered structure was
manifested by low angle x-ray diffraction. The highest
perpendicular anisotropy was obtained inthe films of Co
thickness ~3A.ZnO and Ga2O3 underlayers enhanced effectively the
coercivity of Co/Ptmultilayers. The dependence of the measured
coercivity on the columnsize (characterized by AFM) was
interpreted based on a model of magne-tically independent
columnar particles. The annealing effects on magnetic properties
were also studied.CoPt alloy films grown at the optimized
conditions, 200~250oC with Cocontents 25%, exhibited
perpendicular coercivity ~2.4 KOe and a saturated remanence. By
TEM analysis, the major defects detected inthe films were twins
and the highest concentration of twins was foundin the optimized
sample. Assuming the partial ordering of CoPt3, twins and Co-Co
pairs, induced anisotropy normal to twins-plane was evalu-ated
by a Pair model.Disk coated with the CoPt alloy films was
tested, using a laser sourceof wavelength 680 nm, at 1 MHz
recording frequency and 10 M/s velocity, CNR~45 dB was obtained
with a recording power ~10mW and external field ~300Oe.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT854058001
http://hdl.handle.net/11536/62463
Appears in Collections:Thesis