The experimental magnetic phase diagram for three characteristic Fe/Gd multilayered samples is confirmed on a microscopic scale by Fe-57 Mossbauer spectroscopy using a special geometry. The iron moment rotation in the sample plane at a critical H* external field is observed and signals the transition from an aligned to a twisted state. This behavior is accounted for within the framework of an improved mean-field model. Self-consistent spin maps are derived for given temperatures and external fields applied parallel to the sample plane. A unique set of exchange coupling constants is used to calculate both the mean magnetic properties and the Mossbauer spectroscopy data.
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Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, BrazilUniv Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil
Freire, T.
Salvador, C.
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Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, BrazilUniv Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil
Salvador, C.
Correa, M. A.
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Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, BrazilUniv Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil
Correa, M. A.
Bezerra, C. G.
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Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, BrazilUniv Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil
Bezerra, C. G.
Chesman, C.
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Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, BrazilUniv Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil
Chesman, C.
Oliveira, A. B.
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Univ Fed Rio Grande do Norte, Escola Ciencias & Tecnol, BR-59072970 Natal, RN, BrazilUniv Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil
Oliveira, A. B.
Bohn, F.
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Univ Fed Rio Grande do Norte, Escola Ciencias & Tecnol, BR-59072970 Natal, RN, BrazilUniv Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil