Magnetic loss, permeability, and anisotropy compensation in CoO-doped Mn-Zn ferrites
Mn-Zn ferrite samples prepared by conventional solid state reaction method and sintering at 1325 °C were Co-enriched by addition of CoO up to 6000 ppm and characterized versus frequency (DC – 1GHz), peak polarization (2 mT – 200 mT), and temperature (23 °C – 120 °C). The magnetic losses at room temp...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2018-04-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4993718 |
| _version_ | 1818969572144840704 |
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| author | Cinzia Beatrice Samuel Dobák Vasiliki Tsakaloudi Carlo Ragusa Fausto Fiorillo Luca Martino Vassilis Zaspalis |
| author_facet | Cinzia Beatrice Samuel Dobák Vasiliki Tsakaloudi Carlo Ragusa Fausto Fiorillo Luca Martino Vassilis Zaspalis |
| author_sort | Cinzia Beatrice |
| collection | DOAJ |
| description | Mn-Zn ferrite samples prepared by conventional solid state reaction method and sintering at 1325 °C were Co-enriched by addition of CoO up to 6000 ppm and characterized versus frequency (DC – 1GHz), peak polarization (2 mT – 200 mT), and temperature (23 °C – 120 °C). The magnetic losses at room temperature are observed to pass through a deep minimum value around 4000 ppm CoO at all polarizations values. This trend is smoothed out either by approaching the MHz range or by increasing the temperature. Conversely, the initial permeability attains its maximum value around the same CoO content, while showing moderate monotonical decrease with increasing CoO at the typical working temperatures of 80 – 100 °C. The energy losses, measured by a combination of fluxmetric and transmission line methods, are affected by the eddy currents, on the conventional 5 mm thick ring samples, only beyond a few MHz. Their assessment relies on the separation of rotational and domain wall processes, which can be done by analysis of the complex permeability and its frequency behavior. This permits one, in particular, to calculate the magnetic anisotropy and its dependence on CoO content and temperature and bring to light its decomposition into the host lattice and Co2+ temperature dependent contributions. The temperature and doping dependence of initial permeability and magnetic losses can in this way be qualitatively justified, without invoking the passage through zero value of the effective anisotropy constant upon doping. |
| first_indexed | 2024-12-20T14:22:43Z |
| format | Article |
| id | doaj.art-ba2f0483a14e401384e1c43808fe998e |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-20T14:22:43Z |
| publishDate | 2018-04-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-ba2f0483a14e401384e1c43808fe998e2022-12-21T19:37:53ZengAIP Publishing LLCAIP Advances2158-32262018-04-0184047803047803-1210.1063/1.4993718039891ADVMagnetic loss, permeability, and anisotropy compensation in CoO-doped Mn-Zn ferritesCinzia Beatrice0Samuel Dobák1Vasiliki Tsakaloudi2Carlo Ragusa3Fausto Fiorillo4Luca Martino5Vassilis Zaspalis6Nanoscience and Materials Department, Istituto Nazionale di Ricerca Metrologica INRIM, 10135 Torino, ItalyInstitute of Physics, P.J. Šafárik University, 04022 Košice, SlovakiaLaboratory of Inorganic Materials, CERTH, 57001 Thermi-Thessaloniki, GreeceEnergy Department, Politecnico di Torino, 10129 Torino, ItalyNanoscience and Materials Department, Istituto Nazionale di Ricerca Metrologica INRIM, 10135 Torino, ItalyNanoscience and Materials Department, Istituto Nazionale di Ricerca Metrologica INRIM, 10135 Torino, ItalyDepartment of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceMn-Zn ferrite samples prepared by conventional solid state reaction method and sintering at 1325 °C were Co-enriched by addition of CoO up to 6000 ppm and characterized versus frequency (DC – 1GHz), peak polarization (2 mT – 200 mT), and temperature (23 °C – 120 °C). The magnetic losses at room temperature are observed to pass through a deep minimum value around 4000 ppm CoO at all polarizations values. This trend is smoothed out either by approaching the MHz range or by increasing the temperature. Conversely, the initial permeability attains its maximum value around the same CoO content, while showing moderate monotonical decrease with increasing CoO at the typical working temperatures of 80 – 100 °C. The energy losses, measured by a combination of fluxmetric and transmission line methods, are affected by the eddy currents, on the conventional 5 mm thick ring samples, only beyond a few MHz. Their assessment relies on the separation of rotational and domain wall processes, which can be done by analysis of the complex permeability and its frequency behavior. This permits one, in particular, to calculate the magnetic anisotropy and its dependence on CoO content and temperature and bring to light its decomposition into the host lattice and Co2+ temperature dependent contributions. The temperature and doping dependence of initial permeability and magnetic losses can in this way be qualitatively justified, without invoking the passage through zero value of the effective anisotropy constant upon doping.http://dx.doi.org/10.1063/1.4993718 |
| spellingShingle | Cinzia Beatrice Samuel Dobák Vasiliki Tsakaloudi Carlo Ragusa Fausto Fiorillo Luca Martino Vassilis Zaspalis Magnetic loss, permeability, and anisotropy compensation in CoO-doped Mn-Zn ferrites AIP Advances |
| title | Magnetic loss, permeability, and anisotropy compensation in CoO-doped Mn-Zn ferrites |
| title_full | Magnetic loss, permeability, and anisotropy compensation in CoO-doped Mn-Zn ferrites |
| title_fullStr | Magnetic loss, permeability, and anisotropy compensation in CoO-doped Mn-Zn ferrites |
| title_full_unstemmed | Magnetic loss, permeability, and anisotropy compensation in CoO-doped Mn-Zn ferrites |
| title_short | Magnetic loss, permeability, and anisotropy compensation in CoO-doped Mn-Zn ferrites |
| title_sort | magnetic loss permeability and anisotropy compensation in coo doped mn zn ferrites |
| url | http://dx.doi.org/10.1063/1.4993718 |
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