The zero-field-cooled magnetization at the magnetic field H = 300 Oe shows anomolous kinks at TA and TB (> TA) far below the reentrant spin-glass-like transition temperature Tf (above which a long-range ferrimagnetic ordering is set up). The irreversibility between the zero-field-cooled and the field-cooled magnetizations, and the time decay of the thermoremanent magnetization (σTRM) are observed below the ferrimagnetic Curie temperature Tc. The decay feature can be described by Ogielski's power law σTRM = At-α whose α exhibits peaks at TA, TB, Tf and TC. The peak of α at TC can be fitted by the combination of Ising type and Ginzburg-Landan type expressions. Three stepwise changes of the spin-glass-like state below Tf and the feature of the coexistence of short-range spin-glass and long-range magnetic ordering components above Tf are discussed.
|Number of pages||8|
|Journal||Physica Status Solidi (B) Basic Research|
|Publication status||Published - 1997 Sept|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics