We have investigated magnetic aging and memory effects in the magnetically ordered phase of 32Fe2O3·48Bi2O3·20B2O3 (mol%) glass, which exhibits a spin glass-like transition at about 15 K (Tsg) and a superparamagnetic blocking at about 28 K (Tsp). The present glass manifests magnetic aging effects similar to those observed in spin glasses in the temperature regimes of not only T<Tsg but also Tsg<T<Tsp, indicating that superparamagnetic clusters existing in the glass strongly interact with each other. The interactions among the magnetic clusters lead to cooperative spin dynamics as observed in superspin glasses.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics