Rhein, F. ; Helbig, T. ; Neu, V. ; Krispin, M. ; Gutfleisch, O. (2018)
In-situ magnetic force microscopy analysis of magnetization and demagnetization behavior in Al 3+ substituted Sr-hexaferrite.
In: Acta Materialia, 146
doi: 10.1016/j.actamat.2017.12.010
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The sintering temperature of an Al3+ substituted Sr-hexaferrite composite was systematically varied from 1180 °C to 1280 °C resulting in different microstructures. The grain size was found to range from a few hundred nanometers to several hundred micrometers depending on Al content and sintering temperature. Adding an Al substituted powder to a commercial powder increased the coercivity from 360 mT to 470 mT, at the same time, decreasing remanence from 350 mT to 305 mT. Magnetization and demagnetization processes from the thermally demagnetized state (TDS) and DC-demagnetized state (DCD) have been investigated systematically by in-situ magnetic force microscopy (MFM) under magnetic field. From the surface domain contrast a polarization was derived which quantitatively matches the global i.e. bulk polarization obtained by superconducting quantum interface device (SQUID) magnetometry. The shape of the initial polarization curve and the polarization from the DCD state were correlated with the in-situ MFM data revealing a distinctly different magnetization behavior depending on grain size. The presented results enable a better understanding of local nucleation mechanisms, global influences of pinning centers and further opportunities to improve rare earth (RE) free permanent magnets based on ferrites.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Rhein, F. ; Helbig, T. ; Neu, V. ; Krispin, M. ; Gutfleisch, O. |
| Art des Eintrags: | Bibliographie |
| Titel: | In-situ magnetic force microscopy analysis of magnetization and demagnetization behavior in Al 3+ substituted Sr-hexaferrite |
| Sprache: | Englisch |
| Publikationsjahr: | März 2018 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 146 |
| DOI: | 10.1016/j.actamat.2017.12.010 |
| URL / URN: | https://doi.org/10.1016/j.actamat.2017.12.010 |
| Kurzbeschreibung (Abstract): | The sintering temperature of an Al3+ substituted Sr-hexaferrite composite was systematically varied from 1180 °C to 1280 °C resulting in different microstructures. The grain size was found to range from a few hundred nanometers to several hundred micrometers depending on Al content and sintering temperature. Adding an Al substituted powder to a commercial powder increased the coercivity from 360 mT to 470 mT, at the same time, decreasing remanence from 350 mT to 305 mT. Magnetization and demagnetization processes from the thermally demagnetized state (TDS) and DC-demagnetized state (DCD) have been investigated systematically by in-situ magnetic force microscopy (MFM) under magnetic field. From the surface domain contrast a polarization was derived which quantitatively matches the global i.e. bulk polarization obtained by superconducting quantum interface device (SQUID) magnetometry. The shape of the initial polarization curve and the polarization from the DCD state were correlated with the in-situ MFM data revealing a distinctly different magnetization behavior depending on grain size. The presented results enable a better understanding of local nucleation mechanisms, global influences of pinning centers and further opportunities to improve rare earth (RE) free permanent magnets based on ferrites. |
| Freie Schlagworte: | Hard magnetic materials, Sr-ferrite, Magnetization reversal mechanism, Domain structure, Magnetic force microscopy |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 12 Mär 2018 10:24 |
| Letzte Änderung: | 12 Mär 2018 10:24 |
| PPN: | |
| Sponsoren: | The authors wish to thank Dr. Thomas Berthold (Siemens AG) for the SEM analysis and Mathias Tonski (Tridelta Hartferitte GmbH) for provision of commercial ferrite powder., This work was supported by the German Federal Ministry of Education and Research (grant no 03X3582 - KomMa) and by the German federal state of Hessen through its LOEWE program "RESPONSE". |
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