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

Tetsuya Sato, T. Ando, T. Ogawa, S. Morimoto, A. Ito

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The reentrant spin-glass (RSG) transition and the magnetic nature of the RSG and ferromagnetic (FM) phases of a standard reentrant ferromagnet (57Fe-doped) NiMn were investigated using ac susceptibility and Mössbauer measurements. The spin-freezing temperature, at the observation time of the ac magnetic method, was determined by a peak in the in-phase component of nonlinear susceptibility. The distribution of the hyperfine field in the zero-field Mössbauer data consisted of two peaks in the FM phase hut one antisymmetric peak in the RSG phase. The average hyperfine field rapidly increases so as to deviate from the Brillouin function below a certain temperature. The onset of deviation corresponds to spin freezing on the Mössbauer time scale. The two peaks in the hyperfine field in the FM phase were assigned to two kinds of spin groups having different relaxation times. The spin-freezing process can be explained based on the concept of "melting of frustrated spins" introduced by Saslow and Parker. The local magnetization, deduced based on the in-field Mössbauer data, was dependent on the applied field in the same manner as the magnetization in both the RSG and FM phases. This indicates that a spin-glass correlation coexists with ferromagnetic order in the RSG phase in a different way from the mean-field model for vector spin glasses. The application of a magnetic field induced one additional peak in the hyperfine field in the RSG phase. This implies that the long-range spin-glass order becomes unstable by applying a magnetic field in the RSG phase. Based on all the experimental results, we construct a comprehensive picture of a reentrant ferromagnet.

Original languageEnglish
Article number184432
Pages (from-to)1844321-1844328
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number18
Publication statusPublished - 2001 Nov 1

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Spin glass
Freezing
spin glass
freezing
Magnetization
Magnetic fields
magnetic permeability
magnetization
magnetic fields
Relaxation time
Glass transition
Melting
relaxation time
melting
deviation
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Spin freezing and the ferromagnetic and reentrant spin-glass phases in a reentrant ferromagnet. / Sato, Tetsuya; Ando, T.; Ogawa, T.; Morimoto, S.; Ito, A.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 18, 184432, 01.11.2001, p. 1844321-1844328.

Research output: Contribution to journalArticle

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