Curie temperature of (formula presented) nanocomposite films

H. Zeng, Renat F Sabirianov, O. Mryasov, M. L. Yan, K. Cho, David J Sellmyer

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report results on experimental and theoretical studies of structural and magnetic properties of (formula presented) nanocomposite films. It was found for films prepared by magnetron sputtering with subsequent annealing that lattice parameters a and c of fct FePt change with significantly different rates with increase of the (formula presented) fraction. As a consequence, fundamental magnetic properties change markedly, with the Curie temperature decreasing by 36% for 25% FePt volume fraction compared with the bulk value. Using an ab initio parametrization of magnetic interactions, we propose statistical model of thermal fluctuations in fct FePt, which explains these observations. Our modeling results demonstrate that the observed phenomena originate in the variation of the exchange interaction parameters with the changes in the (formula presented) ratio. We find that the main factor of this variation is the increase of the difference between the in-plane and interplane exchange interactions as (formula presented) decreases from its bulk value due to stress exerted by the (formula presented) matrix.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number18
DOIs
StatePublished - Jan 1 2002

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Nanocomposite films
Exchange interactions
Curie temperature
Magnetic properties
nanocomposites
Magnetron sputtering
Lattice constants
Structural properties
Volume fraction
Annealing
magnetic properties
interactions
lattice parameters
magnetron sputtering
annealing
matrices
Hot Temperature
Statistical Models

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Curie temperature of (formula presented) nanocomposite films. / Zeng, H.; Sabirianov, Renat F; Mryasov, O.; Yan, M. L.; Cho, K.; Sellmyer, David J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 66, No. 18, 01.01.2002, p. 1-6.

Research output: Contribution to journalArticle

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N2 - We report results on experimental and theoretical studies of structural and magnetic properties of (formula presented) nanocomposite films. It was found for films prepared by magnetron sputtering with subsequent annealing that lattice parameters a and c of fct FePt change with significantly different rates with increase of the (formula presented) fraction. As a consequence, fundamental magnetic properties change markedly, with the Curie temperature decreasing by 36% for 25% FePt volume fraction compared with the bulk value. Using an ab initio parametrization of magnetic interactions, we propose statistical model of thermal fluctuations in fct FePt, which explains these observations. Our modeling results demonstrate that the observed phenomena originate in the variation of the exchange interaction parameters with the changes in the (formula presented) ratio. We find that the main factor of this variation is the increase of the difference between the in-plane and interplane exchange interactions as (formula presented) decreases from its bulk value due to stress exerted by the (formula presented) matrix.

AB - We report results on experimental and theoretical studies of structural and magnetic properties of (formula presented) nanocomposite films. It was found for films prepared by magnetron sputtering with subsequent annealing that lattice parameters a and c of fct FePt change with significantly different rates with increase of the (formula presented) fraction. As a consequence, fundamental magnetic properties change markedly, with the Curie temperature decreasing by 36% for 25% FePt volume fraction compared with the bulk value. Using an ab initio parametrization of magnetic interactions, we propose statistical model of thermal fluctuations in fct FePt, which explains these observations. Our modeling results demonstrate that the observed phenomena originate in the variation of the exchange interaction parameters with the changes in the (formula presented) ratio. We find that the main factor of this variation is the increase of the difference between the in-plane and interplane exchange interactions as (formula presented) decreases from its bulk value due to stress exerted by the (formula presented) matrix.

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