Magnetic properties of thin film and granular [formula omitted] as a function of size

M. J. O’shea, H. Jiang, P. Perera, H. H. Hamdeh

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Abstract

Thin amorphous [formula omitted] layers are prepared by sputtering to understand the influence of the spacer layer A on magnetic properties in the DyFe thickness regime where size effects are also important. The spacer layer A in this work is either Ti or Ca and we compare to our earlier work involving a spacer layer of Mo. The [formula omitted] layer is amorphous and Mössbauer spectroscopy indicates that two types of Fe site are present. Finite size effects manifest themselves below a size of 10 nm in a reduction of magnetic ordering temperature [formula omitted] and coercivity [formula omitted] For equal values of d, the reduction of [formula omitted] and [formula omitted] is larger for the system with a Ti or Mo spacer layer as compared to the Ca spacer layer. We argue that both size and the structure of the interface are important in lowering [formula omitted] and [formula omitted] The temperature dependence of coercivity is also studied and suggests that magnetic reversal via domain wall movement occurs in our thinnest films.

Original languageEnglish
Pages (from-to)6137-6139
Number of pages3
JournalJournal of Applied Physics
Volume87
Issue number9
DOIs
StatePublished - May 1 2000

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