Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/37884
Title: L10-FEPT BASED EXCHANGE-COUPLED COMPOSITE (ECC) MEDIA FOR PERPENDICULAR MAGNETIC RECORDING
Authors: HUANG LISEN
Keywords: FePt, exchange-coupled, perpendicular magnetic recording, thermal stability gain, Hall effect, nanodot
Issue Date: 11-Jan-2013
Source: HUANG LISEN (2013-01-11). L10-FEPT BASED EXCHANGE-COUPLED COMPOSITE (ECC) MEDIA FOR PERPENDICULAR MAGNETIC RECORDING. ScholarBank@NUS Repository.
Abstract: L10-FePt faced serious writability problem to become the future magnetic recording media due to the ultrahigh magnetic anisotropy and coercivity. This thesis focuses on the investigation of various L10-FePt based exchange-coupled composite (ECC) media in reducing the coercivity and the magnetization reversal mechanism. The coercivity of L10-FePt exchange spring multilayer was reduced to half, while the thermal stability was maintained. A coercivity reduction factor of 2.5 and a thermal stability gain of 2.2 were achieved in the FePt/Fe bilayer of 3 nm Fe. The magnetic graded interface of FePt/Fe granular nanocomposites produced by annealing did not help to reduce the coercivity, but the coercivity was reduced by ledge-type configuration. The magnetization reversal mechanism of the FePt/Fe ECC nanodots was investigated by Hall measurement. Domain nucleation and propagation was revealed in the angular dependent coercivity plot and the simultaneous measurement of in-plane and out-of-plane magnetization components during the magnetization reversal.
URI: http://scholarbank.nus.edu.sg/handle/10635/37884
Appears in Collections:Ph.D Theses (Open)

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