NDLI: High moment epitaxial Fe-N thin films

Content Provider	IEEE Xplore Digital Library
Author	Soon Cheon Byeon Fenglin Liu Mankey, G.J.
Copyright Year	1965
Abstract	High moment epitaxial Fe-N films were produced using reactive sputtering in an ultra clean sputtering system with in-situ RHEED, and the effects of nitrogen concentration and annealing on magnetic and structural properties were investigated. A sulfur-passivated GaAs substrate was annealed at 450/spl deg/C to get a good RHEED pattern. A 1 nm thick Fe seed layer was then deposited to promote epitaxial growth of a 20 nm thick Ag[100] buffer layer. Fe-N films were grown on these Ag[100] buffer layers. Nitrogen partial pressure and annealing temperature was varied to obtain epitaxial high moment films. Epitaxial GaAs[001]/1 nm Fe/20 nm Ag[001]/40 nm Fe-N[001]/Ru 10 nm films with low nitrogen concentration exhibited an /spl alpha/'-FeN single phase with a magnetization of about 18 kG. Films with high nitrogen concentration exhibited a mixture of /spl alpha/'-FeN and /spl gamma/'-Fe/sub 4/N phases, resulting in low magnetization. Post-annealing of films with low nitrogen concentration increased the magnetization up to 20 kG, but the post-annealing of films with high nitrogen concentration increased the amount of the /spl gamma/'-Fe/sub 4/N phases, resulting in lower magnetization. For films with low nitrogen concentration, sharp RHEED streaks are observed and this is an indication of well-ordered smooth epitaxial films. For films with high nitrogen concentration RHEED streaks are broadened and the background increases which is indicative of an increasing amount of disorder and roughness or possibly a multiphase film. Rms surface roughness of the films was in the range of 0.2-0.6 nm.
Sponsorship	IEEE Magnetics Society
Starting Page	1770
Ending Page	1772
Page Count	3
File Size	93314
File Format	PDF
ISSN	00189464
Volume Number	37
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transistors Nitrogen Magnetization Sputtering Annealing Magnetic films Iron Buffer layers Magnetic properties Gallium arsenide
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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