Modelling of thermomagnetic curves obtained with Mössbauer spectrometry for two-phase nanocrystalline alloys

• Autorzy: Szumiata T. , Gzik-Szumiata M. , Brzózka K.
• Konferencja: Conference New Materials for Magnetoelectronics, Będlewo, 3-6 May 2006
• Języki publikacji: EN

Abstrakty

EN

Thermomagnetic curves obtained with Mössbauer spectrometry for two-phase nanocrystalline alloys have been analyzed theoretically. The main goal was to understand a slope jump in the temperature dependence of the hyperfine field for crystalline phase of higher Curie temperature at the Curie point of the amorphous phase. We propose a simple model introducing an effective exchange integral for one phase depending on mean spin value in the other phase. We also consider a strong spin polarization of the amorphous phase by penetrating field originating from nanocrystallites. Results of numerical calculations within the mean field approximation (MFA) reproduce qualitatively the experimental curves for nanocrystalline FINEMET and Fe-Nb-B alloys.

Słowa kluczowe

EN

nanocrystalline alloy; thermomagnetic curve; two-phase coupled system; MFA approximation; Mössbauer spectrometry

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2007
• Tom: Vol. 25, No. 2
• Strony: 559--564
• Opis fizyczny: Bibliogr. 10 poz.

Twórcy

autor

Szumiata T.

autor

Gzik-Szumiata M.

autor

Brzózka K.

• Department of Physics, Technical University of Radom, ul. Krasickiego 54, 26-600 Radom, Poland

Bibliografia

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• [9] ŚLAWSKA-WANIEWSKA A., ROIG A., MOLINS E., GRENÈCHE J.M., ŻUBEREK R., J. Appl. Phys., 81 (1997), 4652.
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