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Tm-Tb co-substituted Co-Ni nanospinel ferrites (NSFs) as (Co 0.5 Ni 0.5 ) [Tm x Tb x Fe 2-2x ]O 4 (x = 0.00-0.05) NSFs were attained via the ultrasound irradiation technique. The phase identification and morphologies of the NSFs were explored using X-rays diffraction (XRD), selected area electron diffraction (SAED), and transmission and scanning electronic microscopes (TEM and SEM). The magnetization measurements against the applied magnetic field (M-H) were made at 300 and 10 K with a vibrating sample magnetometer (VSM). The various prepared nanoparticles revealed a ferrimagnetic character at both 300 and 10 K. The saturation magnetization (M s ), the remanence (M r ), and magneton number (nB) were found to decrease upon the Tb-Tm substitution effect. On the other hand, the coercivity (H c ) was found to diminish with increasing x up to 0.03 and then begins to increase with further rising Tb-Tm content. The H c values are in the range of 346.7-441.7 Oe at 300 K to 4044.4-5378.7 Oe at 10 K. The variations in magnetic parameters were described based on redistribution of cations, crystallites and/or grains size, canting effects, surface spins effects, super-exchange interaction strength, etc. The observed magnetic results indicated that the synthesized (Co 0.5 Ni 0.5 )[Tm x Tb x Fe 2-x ]O 4 NSFs could be considered as promising candidates to be used for room temperature magnetic applications and magnetic recording media.

Impact of Tm3+ and Tb3+ Rare Earth Cations Substitution on the Structure and Magnetic Parameters of Co-Ni Nanospinel Ferrite