Irreversibility, remanence, and Griffiths phase in Sm0.1Ca0.9MnO3 nanoparticles

摘要: Magnetic properties of compacted Sm0.1Ca0.9MnO3 particles with 25 and 60 nm average sizes have been investigated. Particular attention has paid to Griffiths-like features at temperatures above magnetic transition temperature TC the system glassiness low temperatures. in inverse susceptibility nanoparticles linked presence short range ferromagnetically correlated spin clusters TC. Glassy behavior revealed frequency dependence ac-susceptibility, field thermoremanent isothermoremanent magnetization, time decay remanent magnetization. Experiments major impact glassy component on investigated nanoparticles. The relaxation associated was found be much more pronounced smaller particles, where a formation collective state an ensemble phase separated nanoparticle...