Bance, S. ; Oezelt, H. ; Schrefl, T. ; Ciuta, G. ; Dempsey, N. M. ; Givord, D. ; Winklhofer, M. ; Hrkac, G. ; Zimanyi, G. ; Gutfleisch, O. ; Woodcock, T. G. ; Shoji, T. ; Yano, M. ; Kato, A. ; Manabe, A. (2014)
Influence of defect thickness on the angular dependence of coercivity in rare-earth permanent magnets.
In: Applied Physics Letters, 104 (18)
doi: 10.1063/1.4876451
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The coercive field and angular dependence of the coercive field of single-grain Nd2Fe14B permanent magnets are computed using finite element micromagnetics. It is shown that the thickness of surface defects plays a critical role in determining the reversal process. For small defect thicknesses reversal is heavily driven by nucleation, whereas with increasing defect thickness domain wall de-pinning becomes more important. This change results in an observable shift between two well-known behavioral models. A similar trend is observed in experimental measurements of bulk samples, where an Nd-Cu infiltration process has been used to enhance coercivity by modifying the grain boundaries. When account is taken of the imperfect grain alignment of real magnets, the single-grain computed results appears to closely match experimental behaviour.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Bance, S. ; Oezelt, H. ; Schrefl, T. ; Ciuta, G. ; Dempsey, N. M. ; Givord, D. ; Winklhofer, M. ; Hrkac, G. ; Zimanyi, G. ; Gutfleisch, O. ; Woodcock, T. G. ; Shoji, T. ; Yano, M. ; Kato, A. ; Manabe, A. |
| Art des Eintrags: | Bibliographie |
| Titel: | Influence of defect thickness on the angular dependence of coercivity in rare-earth permanent magnets |
| Sprache: | Englisch |
| Publikationsjahr: | 9 Mai 2014 |
| Verlag: | AIP Publishing LLC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Physics Letters |
| Jahrgang/Volume einer Zeitschrift: | 104 |
| (Heft-)Nummer: | 18 |
| DOI: | 10.1063/1.4876451 |
| Kurzbeschreibung (Abstract): | The coercive field and angular dependence of the coercive field of single-grain Nd2Fe14B permanent magnets are computed using finite element micromagnetics. It is shown that the thickness of surface defects plays a critical role in determining the reversal process. For small defect thicknesses reversal is heavily driven by nucleation, whereas with increasing defect thickness domain wall de-pinning becomes more important. This change results in an observable shift between two well-known behavioral models. A similar trend is observed in experimental measurements of bulk samples, where an Nd-Cu infiltration process has been used to enhance coercivity by modifying the grain boundaries. When account is taken of the imperfect grain alignment of real magnets, the single-grain computed results appears to closely match experimental behaviour. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 17 Nov 2014 09:08 |
| Letzte Änderung: | 17 Nov 2014 09:08 |
| PPN: | |
| Sponsoren: | We acknowledge the financial support from the Technology Research Association of Magnetic Materials for High Efficient Motors (MagHEM). |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum