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Type: Artigo de periódico
Title: Magnetic Anisotropy And Magnetic Phase Transitions In Afe10mo2 (r=pr, Nd, Sm, Dy, Ho, Er, Tm)
Author: Guslienko K.Yu.
Sinnecker E.H.C.P.
Grossinger R.
Abstract: RFe10Mo2 (R=Pr, Sm, Nd, Dy, Ho, Er, Tm) intermetallics were investigated by studying the temperatureor field-induced spin-reorientation transitions (SRT's). The temperature dependence of the magnetic anisotropy field was determined by means of the singular point-detection technique for the polycrystalline samples of YFe10Mo2, NdFe10Mo2, DyFe10Mo2. and ErFe10Mo2. Main emphasis was given to the theoretical analysis of the magnetic anisotropy constants and the magnetic phase transitions. The temperature dependences of the rare-earth anisotropy constants were calculated using the single-ion model within linear theory. The applicability of the linear theory of the R anisotropy is discussed. It is shown that the accuracy of this theory increases considerably with increasing temperature. Fitting the experimental data, a set of the crystal field and exchange field parameters for the rare-earth R3+ ions was deduced. The observed SRT's and first-order magnetization processes (FOMP's) were explained and classified. FOMP-like transitions in PrFe10Mo2, HoFe10Mo2, and ErFe10Mo2, were identified. The temperature dependence of the FOMP fields was calculated for HoFe10Mo2 and ErFe10Mo2. The physical origin of a low-temperature anomaly in the magnetization process is discussed for SmFe10Mo2. The spin-reorientation transitions in ErFe10Mo2 and TmFe10Mo2 are determined to be of first order with a discontinuous jump of the magnetization. The SRT's detected in NdFe10Mo2 and DyFe10Mo2 are of second order. The calculated temperature dependences of the anisotropy fields for DyFe10Mo2 and NdFe10Mo2 are in good agreement with the experimental data over a wide temperature range. FOMP's are predicted at low temperatures for NdFe10Mo2, DyFe10Mo2, and TmFe10Mo2.
Rights: aberto
Identifier DOI: 
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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