Magnetic properties of an amorphous insulating spin glass: manganese aluminosilicate

Abstract

The authors report on susceptibility and magnetisation measurements of amorphous manganese aluminosilicate and demonstrate that they can be considered as insulating spin glasses with large antiferromagnetic interactions. In particular, the cusp of chi (T) at T_f is easily rounded under weak static magnetic fields. The in-field magnetisation curves for Hf depends weakly on the frequency used in susceptibility measurements and this cannot be understood on the basis of the small magnetic particle model.