Magnetic properties of highly dilutedPdFex andPtFex-alloys. Part I. Magnetization at kelvin temperatures

Autor: Thomas Herrmannsdörfer, S. Rehmann, W. Wendler, Frank Pobell
Rok vydání: 1996
Předmět:
Zdroj: Journal of Low Temperature Physics. 104:49-65
ISSN: 1573-7357
0022-2291
Popis: Localized 3 d magnetic moments polarize in palladium and platinum matrices the Pd 4d and Pt 5d conduction electrons in their neighbourhood. This leads to effective “giant magnetic moments” μgm. We have measured the magnetization M(x, B, T) of each ninePdFex andPtFex samples with 2ppm≤x≤260ppm at 1.6K≤T≤300 K and 0 ≤B ≤ 6.0 T. Our main motivation is to determine the size of the giant magnetic moments induced by highly diluted Fe impurities in both transition metals. From the data, taken in a wide polarization range, 9% ≤M/Msat≤93%, we determine the impurity concentrations x, the effective moments μgm, and the spin quantum number J of the samples by fitting to the Brillouin function. ForPdFex, we find a slight increase of μgm with concentration from (13 ± 1.5) μB at x = (2.5 ± 0.5) ppm to (16 ± 1) μB at x = (220 ± 30) ppm. ForPtFex, the moments are almost constant with μgm = (7.8 ± 1) μB at x = 2 to 14 ppm and μgm = (8.6 ± 0.7) μB at x = 75 to 95 ppm. For all samples we obtain a concentration independent very large or possibly infinite spin quantum number, J ≥ 100, which means that the localized giant moments behave as classical ones at T > 1.6 K and Tesla magnetic fields.
Databáze: OpenAIRE
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