VP13-08 Magneto-elastic Properties of Samarium Doped Cobalt-Nickel Ferrite Ceramics Obtained by Spark Plasma Sintering
Creators: Mario Ibuado
Renee Sáenz
Carlos Santillán
José Matutes and María Grijalva
Publisher: name: IEEE
Year: 2025

Cobalt ferrite nanoparticles belong in the smart materials that exhibit large magnetostriction, which makes them good candidates to replace Rare-Earth based alloys like Terfenol-D in technological applications. Proper chose of substituents in either octahedral or tetrahedral sites, and a fine control of their microstructure result in the capability of tunning their magnetic properties. For instance, the substitution of Ni2+ for Co2+ will result in an increase in the magnetic susceptibility, with a detriment in magneto-crystalline anisotropy and, therefore, in saturation magnetization and magnetostriction [1]. The objective of this study is to increase the magnetostriction and magnetic susceptibility with the addition of Sm3+ as a substituent in Fe3+ site. Bulk ceramics were obtained from nanoparticles of Co0.8Ni0.2Fe2-xSmxO4 (x = 0-0.02) by spark plasma sintering. Nanoparticles of the compound were synthesized using the sol-gel method from high purity nitrate precursors. Their composition, structure and microstructure were characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy and dispersive energy spectroscopy. Room temperature hystesis loops and magnetostriction were measured in a Quantum Design Physical Properties Measurement System equipped with a Vibrating Sample Magnetization and Dilatometric Probes. The observed particle size was between 18 and 25 nm. Rietveld refinement was performed using the Fullprof Suite program, confirming the cubic phase, Fd-3m, space group 227. The change in lattice parameter and crystallite size with Ni and Sm content is showed in Table 1, as well as the changes in magneto-elastic properties. From the approximation to saturation calculations, the decrease in saturation magnetization is explained in terms of the reduction of the magneto-crystalline anisotropy coefficient (K1). An increment in magnetic susceptibility and in magnetostriction was observed in the Cobalt-Nickel ferrites doped with 1 at% Sm, attributed to the decrease in microstrains. In addition, the magnetic field required to bring the doped samples to saturation (HS) was lower in samples doped with 2 at% Sm.References: [1] S. Bhame, A.Bhapkar, M. Shirolkar and P. Joy, Journal of the Indian Chemical Society, 99 (8), 100599 (2022).
Cobalt ferrite nanoparticles belong in the smart materials that exhibit large magnetostriction, which makes them good candidates to replace Rare-Earth based alloys like Terfenol-D in technological applications. Proper chose of substituents in either octahedral or tetrahedral sites, and a fine control of their microstructure result in the capability of tunning their magnetic properties. For instance, the substitution of Ni2+ for Co2+ will result in an increase in the magnetic susceptibility, with a detriment in magneto-crystalline anisotropy and, therefore, in saturation magnetization and magnetostriction [1]. The objective of this study is to increase the magnetostriction and magnetic susceptibility with the addition of Sm3+ as a substituent in Fe3+ site. Bulk ceramics were obtained from nanoparticles of Co0.8Ni0.2Fe2-xSmxO4 (x = 0-0.02) by spark plasma sintering. Nanoparticles of the compound were synthesized using the sol-gel method from high purity nitrate precursors. Their composition, structure and microstructure were characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy and dispersive energy spectroscopy. Room temperature hystesis loops and magnetostriction were measured in a Quantum Design Physical Properties Measurement System equipped with a Vibrating Sample Magnetization and Dilatometric Probes. The observed particle size was between 18 and 25 nm. Rietveld refinement was performed using the Fullprof Suite program, confirming the cubic phase, Fd-3m, space group 227. The change in lattice parameter and crystallite size with Ni and Sm content is showed in Table 1, as well as the changes in magneto-elastic properties. From the approximation to saturation calculations, the decrease in saturation magnetization is explained in terms of the reduction of the magneto-crystalline anisotropy coefficient (K1). An increment in magnetic susceptibility and in magnetostriction was observed in the Cobalt-Nickel ferrites doped with 1 at% Sm, attributed to the decrease in microstrains. In addition, the magnetic field required to bring the doped samples to saturation (HS) was lower in samples doped with 2 at% Sm.References: [1] S. Bhame, A.Bhapkar, M. Shirolkar and P. Joy, Journal of the Indian Chemical Society, 99 (8), 100599 (2022).