Microstructure and magnetic properties of Sn-substituted MnZn ferrites

Effect of a YIG nanoparticle additive on the magnetic properties of MnZn ferrites for MHz frequency applications

“…The change in B s with the YIG content is in accordance with that of the density. This is due to that B s is proportional to the density in bulk materials 16 …”

“…This is due to that B s is proportional to the density in bulk materials. 16 Figure 4 shows the temperature dependence of the initial permeability (μ i ) for the MnZn ferrites with different YIG contents. A low content (≤400 ppm) of added YIG nanoparticles enhances μ i .…”

Effects of NiO addition on the microstructure, elemental distribution and magnetic properties of Mn–Zn power ferrites

“…Co 2 O 3 and NiO are expected to dissolve into the lattice and substitute for Mn 2+ or Fe 2+ in the octahedral B-sites, improving microstructure and magnetic properties in Mn-Zn power ferrites [12,14]. There is a slight shift of peak positions to high angles in the XRD patterns of samples with the increase of NiO concentration, suggesting a diminution of the lattice parameters (a) which can be examined by using the relation : a 2 =(λ 2 /4sin 2 θ)(h 2 +k 2 +l 2 ), where h, k and l are the miller indices of each plane [15]. grains become more and more uniform with increasing NiO concentration less than 0.1wt%, while some irregular particles appear as shown in Fig.…”

“…The formation of high resistivity layer on the grain boundaries reduces the P e . However, when NiO content exceeds 0.1 wt%, the μ i decreases and the irreversible domain wall action could be intensified due to the strong pinning effect of uneven grains, irregular particles and crevice zones on domain wall, which results in the increase of P h [15,16]. The particle aggregation and deteriorative microstructure hinder the formation of high resistivity layer, which results in the increase of P e [23].…”

Effects of TiO2 and Co2O3 combination additions on the elemental distribution and electromagnetic properties of Mn–Zn power ferrites

“…The residual losses could be neglected when operating frequency r500 kHz [17][18][19]. The eddy current losses include two parts [20]: the classical eddy current losses (P e,cl ) and the excess eddy current losses (P e,exc ).…”