Spin-Wave Excitations and Fluctuations of the Exchange Interaction in Amorphous Fe1-xZrx Alloys
P. Kossackia, T. Stobieckib and H. Szymczaka
aInstitute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
bInstitute of Electronics, Academy of Mining and Metallurgy, Mickiewicza 30, 30-059 Krakow, Poland
Received: September 18, 1992; revised version: February 26, 1993
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Detailed magnetization measurements were performed on amorphous Fe1-xZrx alloys with 0.14 ≤ x ≤ 0.48 at temperatures ranging from 4.2 K to the Curie temperature in external magnetic field up to 5 T. An analysis of the experimental data reveals that' the fluctuations of the exchange integral resulting from the structural disorder give important contribution to the thermal demagnetization and high-field susceptibility of Fe-rich alloys. For Zr-rich alloys the effect of fluctuations of the exchange integral is negligible and thermal demagnetization is described in terms of spin-wave excitations. No Stoner single-particle excitations were observed for alloys with x > 0.14.
DOI: 10.12693/APhysPolA.83.785
PACS numbers: 75.30.Cr, 75.50.Kj, 75.70.-i