Temperature dependence of core loss in cobalt substituted Ni-Zn-Cu ferrites

Antony Lucas (1, 2) , Richard Lebourgeois (2) , Frederic Mazaleyrat (3) , Eric Labouré (4)

1 SATIE - Systèmes et Applications des Technologies de l'Information et de l'Energie
2 Thales Research and Technology [Palaiseau]
3 SATIE-MME - Matériaux Magnétiques pour l'Energie
4 LGEP - Laboratoire de génie électrique de Paris

The temperature dependence of core loss in cobalt substituted Ni-Zn-Cu ferrites was investigated. Co2+ ions are known to lead to a compensation of the magneto-crystalline anisotropy in Ni-Zn ferrites, at a temperature depending on the cobalt content and the Ni/Zn ratio. We observed similar behaviour in Ni-Zn-Cu and it was found that the core loss goes through a minimum around this magneto-crystalline anisotropy compensation. Moreover, the anisotropy induced by the cobalt allowed a strong decrease of core loss, a ferrite having a core loss of 350 mW/cm3 at 80 °C was then developed (measured at 1.5 MHz and 25 mT). This result represents an improvement of a factor 4 compared to the state of art Ni-Zn ferrites.

Mots clés: NiZnCu ferrite; Cobalt substitution; Core loss versus temperature; Permeability

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Energie électrique

Antony Lucas, Richard Lebourgeois, Frederic Mazaleyrat, Eric Labouré. Temperature dependence of core loss in cobalt substituted Ni-Zn-Cu ferrites. Journal of Magnetism and Magnetic Materials, 2011, 323 (6), pp.735-739. ⟨10.1016/j.jmmm.2010.10.037⟩. ⟨hal-00579404⟩