Hrkac, G. ; Butler, K. ; Woodcock, T. G. ; Saharan, L. ; Schrefl, T. ; Gutfleisch, O. (2014)
Modeling of Nd-Oxide Grain Boundary Phases in Nd-Fe-B Sintered Magnets.
In: JOM, 66 (7)
doi: 10.1007/s11837-014-0980-5
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We use atomistic and micromagnetic simulations combined with atomic-scale, aberration-corrected transmission electron microscopy to study the anisotropy profile of the interface between a Nd2O3-hP5 and a Nd2Fe14B phase. It is shown that a hybrid Morse-Buckingham potential approach can be used to study mixed-metallic and oxide-rich systems and to calculate surface-energy-induced large strains and potentially large relaxation effects on the adjacent grains. These are used to derive a magnetoelastic anisotropy energy from a first-order perturbation of the magnetoelastic Hamiltonian and are used to evaluate its effect on coercivity. It is shown that the change in coercivity originates from these distortions in the Nd2Fe14B crystal lattice close to the grain boundary, and the coercivity can be evaluated using such a multiscale modeling approach.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Hrkac, G. ; Butler, K. ; Woodcock, T. G. ; Saharan, L. ; Schrefl, T. ; Gutfleisch, O. |
| Art des Eintrags: | Bibliographie |
| Titel: | Modeling of Nd-Oxide Grain Boundary Phases in Nd-Fe-B Sintered Magnets |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Juli 2014 |
| Verlag: | Springer US |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | JOM |
| Jahrgang/Volume einer Zeitschrift: | 66 |
| (Heft-)Nummer: | 7 |
| DOI: | 10.1007/s11837-014-0980-5 |
| Kurzbeschreibung (Abstract): | We use atomistic and micromagnetic simulations combined with atomic-scale, aberration-corrected transmission electron microscopy to study the anisotropy profile of the interface between a Nd2O3-hP5 and a Nd2Fe14B phase. It is shown that a hybrid Morse-Buckingham potential approach can be used to study mixed-metallic and oxide-rich systems and to calculate surface-energy-induced large strains and potentially large relaxation effects on the adjacent grains. These are used to derive a magnetoelastic anisotropy energy from a first-order perturbation of the magnetoelastic Hamiltonian and are used to evaluate its effect on coercivity. It is shown that the change in coercivity originates from these distortions in the Nd2Fe14B crystal lattice close to the grain boundary, and the coercivity can be evaluated using such a multiscale modeling approach. |
| 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 09:35 |
| Letzte Änderung: | 17 Nov 2014 09:35 |
| PPN: | |
| Sponsoren: | The authors gratefully acknowledge financial support from the Toyota Motor Corporation and the fruitful discussions with Dr. Kato, Dr. Tetsuja, and Dr. Yano and the EPSRC for financial support under Grants EP/G032440/1 and EP/G032300/1., The authors gratefully acknowledge financial support from the WWTF Project MA09-029, and the Royal Society. |
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