Magnetic anisotropy and magnetic phase transitions in {bold {ital R}}Fe{sub 10}Mo{sub 2} ({bold {ital R}}=Pr, Nd, Sm, Dy, Ho, Er, Tm)

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.380· OSTI ID:459840

Guslienko, K Y; Sinnecker, E H; Grossinger, R ^[1]

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1. Institute for Experimental Physics, Technical University of Vienna, Wiedner Hauptstrasse 8-10, A-1040 Vienna (Austria)

RFe{sub 10}Mo{sub 2} (R=Pr, Sm, Nd, Dy, Ho, Er, Tm) intermetallics were investigated by studying the temperature- or field-induced spin-reorientation transitions (SRTs). The temperature dependence of the magnetic anisotropy field was determined by means of the singular point-detection technique for the polycrystalline samples of YFe{sub 10}Mo{sub 2}, NdFe{sub 10}Mo{sub 2}, DyFe{sub 10}Mo{sub 2}, and ErFe{sub 10}Mo{sub 2}. 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. A set of the crystal field and exchange field parameters for the rare-earth R{sup 3+} ions was deduced. The observed SRTs and first-order magnetization processes (FOMPs) were explained and classified. FOMP-like transitions in PrFe{sub 10}Mo{sub 2}, HoFe{sub 10}Mo{sub 2}, and ErFe{sub 10}Mo{sub 2} were identified. The temperature dependence of the FOMP fields was calculated for HoFe{sub 10}Mo{sub 2} and ErFe{sub 10}Mo{sub 2}. The physical origin of a low-temperature anomaly in the magnetization process is discussed for SmFe{sub 10}Mo{sub 2}. The spin-reorientation transitions in ErFe{sub 10}Mo{sub 2} and TmFe{sub 10}Mo{sub 2} are determined to be of first order with a discontinuous jump of the magnetization. The SRTs detected in NdFe{sub 10}Mo{sub 2} and DyFe{sub 10}Mo{sub 2} are of second order. The calculated temperature dependences of the anisotropy fields for DyFe{sub 10}Mo{sub 2} and NdFe{sub 10}Mo{sub 2} are in good agreement with the experimental data over a wide temperature range. FOMPs are predicted at low temperatures for NdFe{sub 10}Mo{sub 2}, DyFe{sub 10}Mo{sub 2}, and TmFe{sub 10}Mo{sub 2}.

• OSTI ID: 459840
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL FIELD
EXCHANGE INTERACTIONS
INTERMETALLIC COMPOUNDS
IRON BASE ALLOYS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MOLYBDENUM ALLOYS
PHASE TRANSFORMATIONS
RARE EARTH ALLOYS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION TEMPERATURE