Author/Authors :
Yuko Hayakawa، نويسنده , , SHIGEMI KOHIKI، نويسنده , , Michi Sato، نويسنده , , Yuko Sonda، نويسنده , , Tomohiro Babasaki، نويسنده , , Hiroyuki Deguchi، نويسنده , , Akiko Hidaka، نويسنده , ,
HIROKAZU SHIMOOKA، نويسنده , , Seiji Takahashi، نويسنده ,
Abstract :
An assembly of Co3O4 nanocrystals dispersed in an amorphous silicate was prepared by calcination of molecular sieve soaked in precursor solution with the concentration of 0.1 mol/l. We observed the disappearance of antiferromagnetic phase transition at 33 K of bulk Co3O4, and frequency dependence of the cusp temperature below 30 K in the AC susceptibility measurement. Divergent peaks at around 18 and 22 K were observed in the nonlinear susceptibility measurement, implying that the sample is in the spin-glass phase. The magnetic interparticle interactions were collective for the Co3O4 nanocrystals dispersed in nonmagnetic silicate.
