The effects of spark plasma sintering consolidation on the ferromagnetic resonance spectra (FMR) of Ni-Zn ferrites

作者：Ortega Zempoalteca R; Flores Arias Y; Vazquez Victorio G; Gaudisson T; Ammar S; Vargas Osorio Z; Acevedo Salas U; Valenzuela R^*

来源：Physica Status Solidi A-Applications and Materials Science, 2014, 211(5): 1062-1066.

DOI：10.1002/pssa.201300762

• ferrite nanoparticles
• ferromagnetic resonance (FMR)
• spark plasma sintering (SPS)

Magnetic nanoparticles (NPs) of magnetite and Ni-Zn ferrites, synthesized by the forced hydrolysis in a polyol method, were used as the starting material to consolidate them by means of the spark plasma sintering (SPS) method. The microstructural changes were analyzed by X-ray diffraction, transmission electron microscopy (TEM), magnetic hysteresis loops, and ferromagnetic resonance (FMR) measurements. FMR spectra changed from a high resonance field and small linewidth for the nanoparticles to a spectrum with reduced resonance field with extremely broadened linewidths for the consolidated materials. These effects can be ascribed to the evolution from superparamagnetic NPs to the formation of a nanostructured ceramic structure with high grain-to-grain interactions and with increased randomly distributed anisotropy axes.

• 出版日期2014-5