NDLI: Sintering Effect of Annealed FePt Nanocrystal Films Observed by Magnetic Force Microscopy

Content Provider	IEEE Xplore Digital Library
Author	Changbae Hyun Lee, D.C. Israel, C. Korgel, B.A. de Lozanne, A.
Copyright Year	1965
Abstract	Chemically synthesized FePt nanocrystals can exhibit room temperature ferromagnetism after being annealed at temperatures above 500degC. In thick films composed of FePt nanocrystals, the coercivity can be quite large. However, the coercivity of thin films has been found to decrease significantly with decreasing thickness, to the point that ferromagnetism at room temperature is lost. We studied 12 to 55 nm thick films by using magnetic force microscopy (MFM) under external applied fields. We made smooth films by spin casting 4-nm-diameter FePt nanocrystals and annealing them at 605degC-630degC. Thin FePt films showed lower coercivity than thick films. To help interpret the MFM images, we obtained complementary magnetic and structural data by superconducting quantum interference device (SQUID) magnetometry, transmission electron microscopy (TEM), and X-ray diffraction. We conclude that the magnetic properties of these films are strongly affected by nanocrystal aggregation that occurs during annealing
Sponsorship	IEEE Magnetics Society
File Size	3557052
File Format	PDF
ISSN	00189464
Volume Number	42
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Annealing Nanocrystals Magnetic films Magnetic forces Magnetic force microscopy Superconducting films Transmission electron microscopy Temperature Thick films Coercive force sintering FePt magnetic force microscopy (MFM) nanocrystal
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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