μSR-Study of a 3% CoFe2O4 Nanoparticle Concentration Ferrofluid

Magnetic fluids based on single-domain magnetic spinel ferrite nanoparticles dispersed in various liquid media are of particular practical and scientific interest. This paper presents a muon spectroscopy study ferrofluid CoFe2O4 molecules water (H2O) with nanoparticle concentration 3%. In this study, it was determined that the structure magnitude magnetization depend viscosity itself. It shown that, at room temperature (290 K) under an external field 527 G, observed additional ~20 G. small fraction sample (~20%), negative (diamagnetism) observed. At low temperatures (~30 K), acted as paramagnet field. For first time, inside immediate vicinity has been measured experimentally using μSR method: value 1.96 ± 0.44 kG; thus, direct measurement nanoscale object performed.