Magnetic behavior of nano-crystalline ruthenium perovskites, CaRuO 3 and SrRuO3

Abstract

We have investigated the magnetic behavior of the nan-ocrystalline form of the well known ruthenium perovskites, CaRuO3 (paramagnetic, non-Fermi liquid system) and SrRuO3 (ferromagnetic below 160 K), synthesized by high energy ball milling. It is found that the effective moment as well as the magnetization value at high fields (in the magnetically state) decreased for a reduction in particle size for both the compounds. The nano-crystalline form of SrRuO3 appears to be magnetically harder as compared to the bulk material, whereas CaRuO3 remains paramagnetic even in the nano-crystalline form. Otherwise, there is no other qualitative change in the magnetic behavior of both the compounds for the reduced particle-sizes, thereby indicating that the magnetic correlation lengths are small for these compounds. � 2012 American Institute of Physics.