Influence of flexible substrate thickness on static and dynamic magnetic properties of FeCoB thin films

Publication: Research - peer-reviewJournal article – Annual report year: 2010

Without internal affiliation

  • Author: Phuoc, Nguyen Nguyen

    National University of Singapore, Singapore

  • Author: Le, Thanh Hung

    Unknown

  • Author: Ong, C K

    National University of Singapore, Singapore

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The influence of substrate thickness on the static and dynamic properties of FeCoB thin films grown onto flexible substrates by the sputtering technique was extensively investigated and the result was analysed based on the Landau–Lifshitz–Gilbert equation. The existence of rotatable magnetic anisotropy was observed and discussed within the framework of ripple theory. It was found that the variation of the rotatable anisotropy field with substrate thickness is roughly coincident with that of coercivity. This suggests that the arising of rotatable anisotropy and the enhancement of coercivity when the substrate thickness is reduced has the same mechanism, i.e. the existence of local random anisotropy. The ferromagnetic resonance frequency is enhanced and the frequency linewidth is broader as the substrate thickness is reduced, which is possibly related to the decrease in the stress in the films. The observed small variation of static permeability with substrate thickness suggests that reducing the substrate thickness is a good way to obtain high effective permeability.
Original languageEnglish
JournalJournal of Physics D: Applied Physics
Publication date2010
Volume43
Issue25
Pages255001
ISSN0022-3727
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 4
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