Spin freezing and the ferromagnetic and reentrant spin-glass phases in a reentrant ferromagnet

Physical Review B - Condensed Matter and Materials Physics

Volumn 64, Issue 18, 2001, Pages

  Sato, T ^a   Ando, T ^a   Ogawa, T ^a   Morimoto, S ^b   Ito, A ^b  

^a KEIO UNIVERSITY   (Japan)

^b OCHANOMIZU UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

FERROMAGNETIC MATERIAL; IRON DERIVATIVE;

ACCELERATION; ARTICLE; CHEMICAL ANALYSIS; CORRELATION FUNCTION; MAGNETIC FIELD; MAGNETISM; MOSSBAUER SPECTROSCOPY; TEMPERATURE;

EID: 0012624187     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.64.184432     Document Type: Article

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33. It is not easy to find the onset of an additional increase in the hyperfine field in excess of the value extrapolated from higher temperatures, because the temperature-dependent magnetization in the FM phase cannot be given by a conventional theoretical expression. We note that a previous experimental neutron study of (formula presented) showed the Ni moments of (formula presented) and a Mn moment of (formula presented) In addition, the Ni moment has an itinerant electron nature, while the Mn moment has a localized electron character [see J W. Cable, R M. Nicklow, and Y. Tsunoda, Phys. Rev. B36, 5311 (1987)].
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35. Provided that these spin freezing temperatures are tentatively analyzed based on an expression of the critical slowing down, (formula presented)using (formula presented) we evaluate (formula presented) and (formula presented) assuming a microscopic spin flipping time (formula presented) of (formula presented) This evaluated value of (formula presented) is comparable to what has been found in a reentrant ferromagnet (formula presented) (formula presented) (Ref. 4) and ordinary spin-glasses.
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37. The closed circle shows a datum obtained after the applied field decreases to 4 kOe from the highest field. Within the limit of experimental accuracy, reversible behavior does exist in the field dependence.
38. In the FM region, (formula presented) is approximately calculated based on (formula presented) because the magnetization is intrinsically related to the main distribution of the hyperfine field.