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Enhanced magnetic anisotropy of nickel nanosheet prepared in Na-4 mica
S MITRA, A MANDAL, A DATTA, , D CHAKRAVORTY
Published in ELSEVIER SCIENCE BV
2012
Volume: 324
   
Issue: 16
Pages: 2452 - 2457
Abstract
Nanosheets of nickel with thickness equal to 0.6 nm have been grown within the interlayer spaces of Na-4 mica. The sheets are made up of percolative clusters of nanodisks. Magnetization characteristics indicate a superparamagnetic behavior with a blocking temperature of 428 K. The magnetic anisotropy constant as extracted from the coercivity data has been found to be higher than that of bulk nickel by two orders of magnitude. This is ascribed to a large aspect ratio of the nickel nanophase. The Bloch exponent is also found to be considerably different from that of bulk nickel because of a size effect. The Bloch equation is still found to be valid for the two dimensional structures. © 2012 Elsevier B.V. All rights reserved.
About the journal
JournalData powered by TypesetJournal of Magnetism and Magnetic Materials
PublisherData powered by TypesetELSEVIER SCIENCE BV
ISSN0304-8853
Open AccessYes