Size Effects on Magnetic Properties ofNi0.5Zn0.5Fe2O

Abstract

Ni0.5Zn0.5Fe2O4particles with different particle sizes have been synthesized by sol-gel method. X-ray diffraction results show that all the samples are pure cubic spinel structure with their sizes ranging from 9 to 96 nm. The lattice constant significantly decreases with further increasing annealing temperature. The magnetic measurements show superparamagnetic nature below the particle size of 30 nm, while others show ferrimagnetic nature above the corresponding blocking temperature. The blocking temperature increases with the increase in particle size, which can be explained by Stoner-Wohlfarth theory. The saturation magnetization increases as the particle size increases, which can be explained by the cation redistribution on tetrahedral A and octahedral B sites and the domain wall motion. The variation of coercivity as a function of particle size is based on the domain structure.

Experimental Investigation of the Magnetorheological Behavior of PDMS Elastomer Reinforced with Iron Micro/Nanoparticles

“…It is seen from Figure 8 that nanoparticles exhibit a lower magnetization of about 14% compared to microparticles when the magnetic field exceeds 557 kA·m −1 . A similar trend was reported by Zhang et al [39]. The magnetic saturation field value between iron particle powder and the composite material drops from ~ 200 to ~ 40 A·m 2 ·kg −1 because the iron particle content added into the PDMS matrix is only 20 wt %.…”

Synthesis, Characterization, and Magnetic Properties of Pure and EDTA-Capped NiO Nanosized Particles

“…This variation of with particle size can be explained on the basis of domain structure, critical size, and surface as well as interface anisotropy of the crystal. A crystallite will spontaneously break up into a number of domains in order to reduce the large magnetization energy if it is a single domain [40]. The ratio of the energy before and after division into domains varied as √ [41], where is the particle size.…”

Magnetic materials for magnetoelectric coupling: An unexpected journey

“…Different synthesis methods such as sol-gel (Zhang et al, 2013), citrate gel method (Jiang et al, 2011), reverse microemulsion (Kumar et al, 2010), sonochemical method (Meskin et al, 2006), hydrothermal process (Meskin et al, 2006), co-precipitation (Thakur et al, 2016) and auto-combustion method (Wu et al, 2005) have been used to synthesize Ni0.5Zn0.5Fe2O4 nanoparticles. All these methods can fulfill the requirements of singlephase and single-domain nanoparticles production; however, to have cost effective route for the high-yield synthesis of nanoparticles for practical applications is still a concern (Atif, 2019).…”