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Mo¨ssbauer studies of amorphous rare earth‐Fe2alloys

 

作者: D. W. Forester,  

 

期刊: AIP Conference Proceedings  (AIP Available online 1976)
卷期: Volume 31, issue 1  

页码: 384-389

 

ISSN:0094-243X

 

年代: 1976

 

DOI:10.1063/1.30784

 

出版商: AIP

 

数据来源: AIP

 

摘要:

57Fe hyperfine spectra have been measured in several bulk amorphous rare earth‐iron (RE‐FE) alloys including DyFe2, GdFe2and SmFe2. GdFe2and SmFe2have magnetic ordering temperatures (Tc) above room temperature whereas for DyFe2,Tc=229 ±3°K. DyFe2, which has large local anisotropy associated with the rare‐earth orbital angular momentum, displays broad asymmetrical hyperfine patterns. GdFe2which has weak local anisotropy, has a broad symmetrical pattern and a much higherTc. The asymmetrical hyperfine patters are interpreted in terms of averages over the randomly distributed quadrupolar and pseudo‐dipolar hyperfine field directions. The average hyperfine fields at low temperature are found to scale, for the most part, with the spin (g−1)J of the rare earth. However, the average fields measured in this study are markedly lower for the lighter rare earths than observed in previous Mo¨ssbauer studies of thin‐film ’’amorphous’’ alloys. A dramatic reduction of the recoil‐free fraction is observed to occur as the temperature is lowered belowTcin DyFe2.

 

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