dc.contributor.author | Bance, S | |
dc.contributor.author | Oezelt, H | |
dc.contributor.author | Schrefl, T | |
dc.contributor.author | Ciuta, G | |
dc.contributor.author | Dempsey, NM | |
dc.contributor.author | Givord, D | |
dc.contributor.author | Winklhofer, M | |
dc.contributor.author | Hrkac, G | |
dc.contributor.author | Zimanyi, G | |
dc.contributor.author | Gutfleisch, O | |
dc.contributor.author | Woodcock, TG | |
dc.contributor.author | Shoji, T | |
dc.contributor.author | Yano, M | |
dc.contributor.author | Kato, A | |
dc.contributor.author | Manabe, A | |
dc.date.accessioned | 2016-04-27T12:53:58Z | |
dc.date.issued | 2014-05-09 | |
dc.description.abstract | The coercive field and angular dependence of the coercive field of single-grain Nd$_{2}$Fe$_{14}$B 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 a 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. | en_GB |
dc.description.sponsorship | We acknowledge the financial support from the Technology Research Association of Magnetic Materials for High Efficient Motors (MagHEM). | en_GB |
dc.identifier.citation | Vol. 104 (18), article 182408 | en_GB |
dc.identifier.doi | 10.1063/1.4876451 | |
dc.identifier.uri | http://hdl.handle.net/10871/21281 | |
dc.language.iso | en | en_GB |
dc.publisher | American Institute of Physics (AIP) | en_GB |
dc.subject | Coercive force | en_GB |
dc.subject | Domain walls | en_GB |
dc.subject | Nucleation | en_GB |
dc.subject | Magnets | en_GB |
dc.subject | Infiltration | en_GB |
dc.title | Influence of defect thickness on the angular dependence of coercivity in rare-earth permanent magnets | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2016-04-27T12:53:58Z | |
dc.description | This is the final version of the article. Available from the American Institute of Physics via the DOI in this record. | en_GB |
dc.identifier.journal | Applied Physics Letters | en_GB |