Effect of cobalt addition on the magneto-crystalline anisotropy parameter of sintered NiZn ferrites evaluated from magnetization curves

•Magnetization curves obtained from 50 to 600 K on NiZnCoCu ferrite.•Magneto-crystalline anisotropy parameter K1 determined from magnetization curves.•Core loss measured up to 5 MHz with a focus on the role of cobalt addition.•Co addition up to 0.02 mol leads to a small change in K1.•Co addition up...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 473; pp. 92 - 98
Main Authors Frajer, G., Isnard, O., Chazal, H., Delette, G.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.03.2019
Elsevier BV
Elsevier
Subjects
Anisotropy
Co addition
Cobalt
Condensed Matter
Core loss
Crystal structure
Crystallinity
Domain walls
Ferrites
Grain size
High frequency
Magnetization
Magnetization curves
Materials Science
NiZnCu
Other
Parameters
Physics
Polycrystals
Sintering
Spinel ferrite
Core-loss
Co addition
High frequency
NiZnCu
Spinel ferrite
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Summary:•Magnetization curves obtained from 50 to 600 K on NiZnCoCu ferrite.•Magneto-crystalline anisotropy parameter K1 determined from magnetization curves.•Core loss measured up to 5 MHz with a focus on the role of cobalt addition.•Co addition up to 0.02 mol leads to a small change in K1.•Co addition up to 0.02 mol leads to 2.5 times lower core loss at 1.5 MHz – 25 mT. This paper investigates the effect of the cobalt addition on the magneto-crystalline anisotropy parameter of some polycrystalline ferrites. Magnetization curves have been experimentally determined at different temperatures on Ni1−xZnxFe2O4 sintered samples with or without cobalt addition. In each case, a law of approach to saturation has been fitted to the measured data in order to extract the anisotropy parameter K1 representative for the polycrystalline material. Besides, measurement of the complex susceptibility and power core-loss up to 5 MHz has been performed. This approach allows a discussion on the role of cobalt addition on the power core-loss mitigation. It has been found that the substitution with 0.02 mol. of Co leads to a small decrease in the K1 values. This evolution is consistent with the rise in the rotational permeability. However, the change in K1 cannot account for the core-loss reduction with Co. Rather, it is confirmed that Co hinders the domain wall displacement and subsequent dissipation up to an induction level that depends on the grain size.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.10.030