The Effects of CrV Underlayer on the Structure and Magnetic Properties of FePt Thin Film

Title
The Effects of CrV Underlayer on the Structure and Magnetic Properties of FePt Thin Film
Authors
천동원김성만김긍호정원용
Keywords
FePt L10; CrV underlayer; perpendicular magnetic recording media; FePt film; in-situ ordering
Issue Date
2010-06
Publisher
IEEE transactions on magnetics
Citation
VOL 46, NO 6, 1856-1858
Abstract
An attempt is made in this study to employ vanadium containing chromium (CrV) alloy underlayer to control the microstructure and ultimately to facilitate the in-situ ordering of Fe-Pt thin film. CrV alloys with V contents ranging from 0 to 15 at% were investigated to evaluate their effects on the magnetic properties and structural modification of FePt thin film. Addition of V in Cr underlayer results in the formation of FePt L10 phase with (001) preferred orientation. Analysis of XRD and HR-TEM results reveals that the lattice expansion of Cr underlayer induced by V addition increases the lattice misfit strain between CrV underlayer and FePt magnetic layer. Consequently well aligned FePt (001) grains and in-situ ordering of FePt L10 thin film can be obtained. Magnetic property measurements show that FePt/Pt/5.8 at.%V-Cr multilayer has the maximum out-of-plane coercivity (4000 Oe) and squareness (0.95). Due to in-situ ordering, good perpendicular magnetic properties with higher coercivity and squareness were achieved from FePt/Pt/Cr94.2V5.8 multi-layers at the processing temperature of 350 ℃ without further annealing treatment.
URI
http://pubs.kist.re.kr/handle/201004/37710
ISSN
0018-9464
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KIST Publication > Article
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