CoO-doping is known to stabilize the temperature dependence of initial permeability and magnetic losses in Mn-Zn ferrites, besides providing, with appropriate dopant contents, good soft magnetic response at and around room temperature. These effects, thought to derive from the mechanism of anisotropy compensation, are, however, poorly assessed from a quantitative viewpoint. In this work, we overcome such limitations by providing, besides extensive experimental investigation vs frequency (DC–1 GHz), CoO content (0 ≤ CoO ≤ 6000 ppm), and temperature (−20 °C ≤ T ≤ 130 °C) of permeability and losses of sintered Mn-Zn ferrites, a comprehensive theoretical framework. This relies on the separate identification of domain wall motion and moment rotations and on a generalized approach to magnetic loss decomposition. The average effective anisotropy constant ⟨Keff⟩ is obtained and found to monotonically decrease with temperature, depending on the CoO content. The quasistatic energy loss Wh is then predicted to pass through a deep minimum for CoO = 3000–4000 ppm at and below the room temperature, while becoming weakly dependent on CoO under increasing T. The rotational loss Wrot(f) is calculated via the complex permeability, as obtained from the Landau-Lifshitz equation for distributed values of the local effective anisotropy field Hk,eff (i.e., ferromagnetic resonance frequency). Finally, the excess loss Wexc(f) is derived and found to comply with suitable analytical formulation. It is concluded that, by achieving, via the rotational permeability, value and behavior of the magnetic anisotropy constant, we can predict the ensuing properties of hysteresis, excess, and rotational losses.
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14 October 2019
Research Article|
October 09 2019
The temperature dependence of magnetic losses in CoO-doped Mn-Zn ferrites
Cinzia Beatrice
;
Cinzia Beatrice
a)
1
Advanced Materials Metrology and Life Science Division, Istituto Nazionale di Ricerca Metrologica INRIM
, 10135 Torino, Italy
a)Author to whom correspondence should be addressed: c.beatrice@inrim.it.
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Samuel Dobák
;
Samuel Dobák
b)
2
Institute of Physics, P.J. Šafárik University
, 04154 Košice, Slovakia
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Vasiliki Tsakaloudi;
Vasiliki Tsakaloudi
3
Laboratory of Inorganic Materials, CERTH
, 57001 Thermi-Thessaloniki, Greece
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Carlo Ragusa
;
Carlo Ragusa
4
Department of Energy, Politecnico di Torino
, 10129 Torino, Italy
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Fausto Fiorillo
Fausto Fiorillo
1
Advanced Materials Metrology and Life Science Division, Istituto Nazionale di Ricerca Metrologica INRIM
, 10135 Torino, Italy
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a)Author to whom correspondence should be addressed: c.beatrice@inrim.it.
b)
This research was performed while S. Dobák was at the Advanced Materials Metrology and Life Science Division of INRIM, Torino, Italy, under grant from the National Scholarship Program of the Slovak Republic.
J. Appl. Phys. 126, 143902 (2019)
Article history
Received:
July 09 2019
Accepted:
September 25 2019
Citation
Cinzia Beatrice, Samuel Dobák, Vasiliki Tsakaloudi, Carlo Ragusa, Fausto Fiorillo; The temperature dependence of magnetic losses in CoO-doped Mn-Zn ferrites. J. Appl. Phys. 14 October 2019; 126 (14): 143902. https://doi.org/10.1063/1.5118824
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