Agradecimentos: P.T., P.C.R.-R., and L.M.S. acknowledge the Argentinean agency CONICET for financial support. D.M. and M.K. acknowledge the National Council for Scientific and TechnologicalDevelopment (CNPq), Grant No. #425501/2018-3, Brazilian agencies Fundação de-Amparo a Pesquisa do Estado de São...

Agradecimentos: P.T., P.C.R.-R., and L.M.S. acknowledge the Argentinean agency CONICET for financial support. D.M. and M.K. acknowledge the National Council for Scientific and TechnologicalDevelopment (CNPq), Grant No. #425501/2018-3, Brazilian agencies Fundação de-Amparo a Pesquisa do Estado de São Paulo (FAPESP), Grant No. #17/10581, and the Brazilian Nanotechnology National Laboratory (LNNano) for the use of the electron microscopy facility, Project No. ME-22345

Abstract: The present work describes a synthesis and characterization strategy employed to study the magnetic anisotropic properties of a diluted nanoparticulate system. The system under analysis is composed of monodisperse and highly crystalline 16 nm Co0.5Fe2.5O4 nanoparticles (NPs), homogenously...

Abstract: The present work describes a synthesis and characterization strategy employed to study the magnetic anisotropic properties of a diluted nanoparticulate system. The system under analysis is composed of monodisperse and highly crystalline 16 nm Co0.5Fe2.5O4 nanoparticles (NPs), homogenously dispersed in 1-octadecene. Owing to the liquid nature of the matrix at room temperature, the relative orientation of the nanoparticle easy axis can be controlled by an external magnetic field, enabling us to measure how the magnetic properties are modified by the alignment of the particles within the sample. In turn, by employing this strategy, we have found a significant hardness and squareness enhancement of the hysteresis loop in the magnetically oriented system, with the coercive field reaching a value as high as 30.2 kOe at low temperatures. In addition, the magnetic behavior associated with the system under study was supported by additional magnetic measurements, which were ascribed to different events expected to take place throughout the sample characterization, such as the melting process of the 1-octadecene matrix or the NP relaxation under the Brownian mechanism at high temperatures

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

425501/2018-3

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

17/10581

Fechado