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Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders
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| Zeitschriftentitel: | AIP Advances |
|---|---|
| Personen und Körperschaften: | , |
| In: | AIP Advances, 8, 2018, 5 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
AIP Publishing
|
| Schlagwörter: |
| author_facet |
Akagi, Fumiko Ishii, Yoshitake Akagi, Fumiko Ishii, Yoshitake |
|---|---|
| author |
Akagi, Fumiko Ishii, Yoshitake |
| spellingShingle |
Akagi, Fumiko Ishii, Yoshitake AIP Advances Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders General Physics and Astronomy |
| author_sort |
akagi, fumiko |
| spelling |
Akagi, Fumiko Ishii, Yoshitake 2158-3226 AIP Publishing General Physics and Astronomy http://dx.doi.org/10.1063/1.5005047 <jats:p>In this study, we simulated the effects of the anisotropy field (Hk) dispersion of the grains (the main phases and the deterioration layers) for a NdFeB magnetic powder on Hc and squareness ratio in consideration of the magnetic properties of the grain boundaries and the deterioration layer of the grain surface using a micromagnetic simulator. The Hc decreases as increasing the coefficient variation of Hk (σHk/&lt;Hk&gt;; σHk: standard deviation, &lt;Hk&gt;: average) of the grain for the soft magnetic grain boundary, however, is independent of the σHk/&lt;Hk&gt; for the non-magnetic grain boundary. The squareness ratio is 1.0 up to a σHk/&lt;Hk&gt; of 25% for the soft magnetic grain boundary, however, decreases as the σHk/&lt;Hk&gt; increases for the non-magnetic grain boundary. Comparing the calculation and experimental values, when the grain boundary was non-magnetic and the σHk/&lt;Hk&gt; was 25 to 30%, the Hc and the squareness ratio were close to the experimental values.</jats:p> Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders AIP Advances |
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| title |
Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_unstemmed |
Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_full |
Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_fullStr |
Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_full_unstemmed |
Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_short |
Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_sort |
effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for hddr-processed ndfeb powders |
| topic |
General Physics and Astronomy |
| url |
http://dx.doi.org/10.1063/1.5005047 |
| publishDate |
2018 |
| physical |
|
| description |
<jats:p>In this study, we simulated the effects of the anisotropy field (Hk) dispersion of the grains (the main phases and the deterioration layers) for a NdFeB magnetic powder on Hc and squareness ratio in consideration of the magnetic properties of the grain boundaries and the deterioration layer of the grain surface using a micromagnetic simulator. The Hc decreases as increasing the coefficient variation of Hk (σHk/&lt;Hk&gt;; σHk: standard deviation, &lt;Hk&gt;: average) of the grain for the soft magnetic grain boundary, however, is independent of the σHk/&lt;Hk&gt; for the non-magnetic grain boundary. The squareness ratio is 1.0 up to a σHk/&lt;Hk&gt; of 25% for the soft magnetic grain boundary, however, decreases as the σHk/&lt;Hk&gt; increases for the non-magnetic grain boundary. Comparing the calculation and experimental values, when the grain boundary was non-magnetic and the σHk/&lt;Hk&gt; was 25 to 30%, the Hc and the squareness ratio were close to the experimental values.</jats:p> |
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| author | Akagi, Fumiko, Ishii, Yoshitake |
| author_facet | Akagi, Fumiko, Ishii, Yoshitake, Akagi, Fumiko, Ishii, Yoshitake |
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| description | <jats:p>In this study, we simulated the effects of the anisotropy field (Hk) dispersion of the grains (the main phases and the deterioration layers) for a NdFeB magnetic powder on Hc and squareness ratio in consideration of the magnetic properties of the grain boundaries and the deterioration layer of the grain surface using a micromagnetic simulator. The Hc decreases as increasing the coefficient variation of Hk (σHk/&lt;Hk&gt;; σHk: standard deviation, &lt;Hk&gt;: average) of the grain for the soft magnetic grain boundary, however, is independent of the σHk/&lt;Hk&gt; for the non-magnetic grain boundary. The squareness ratio is 1.0 up to a σHk/&lt;Hk&gt; of 25% for the soft magnetic grain boundary, however, decreases as the σHk/&lt;Hk&gt; increases for the non-magnetic grain boundary. Comparing the calculation and experimental values, when the grain boundary was non-magnetic and the σHk/&lt;Hk&gt; was 25 to 30%, the Hc and the squareness ratio were close to the experimental values.</jats:p> |
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| spelling | Akagi, Fumiko Ishii, Yoshitake 2158-3226 AIP Publishing General Physics and Astronomy http://dx.doi.org/10.1063/1.5005047 <jats:p>In this study, we simulated the effects of the anisotropy field (Hk) dispersion of the grains (the main phases and the deterioration layers) for a NdFeB magnetic powder on Hc and squareness ratio in consideration of the magnetic properties of the grain boundaries and the deterioration layer of the grain surface using a micromagnetic simulator. The Hc decreases as increasing the coefficient variation of Hk (σHk/&lt;Hk&gt;; σHk: standard deviation, &lt;Hk&gt;: average) of the grain for the soft magnetic grain boundary, however, is independent of the σHk/&lt;Hk&gt; for the non-magnetic grain boundary. The squareness ratio is 1.0 up to a σHk/&lt;Hk&gt; of 25% for the soft magnetic grain boundary, however, decreases as the σHk/&lt;Hk&gt; increases for the non-magnetic grain boundary. Comparing the calculation and experimental values, when the grain boundary was non-magnetic and the σHk/&lt;Hk&gt; was 25 to 30%, the Hc and the squareness ratio were close to the experimental values.</jats:p> Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders AIP Advances |
| spellingShingle | Akagi, Fumiko, Ishii, Yoshitake, AIP Advances, Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders, General Physics and Astronomy |
| title | Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_full | Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_fullStr | Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_full_unstemmed | Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_short | Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| title_sort | effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for hddr-processed ndfeb powders |
| title_unstemmed | Effects of anisotropy field dispersion and grain boundary on coercivity and squareness ratio for HDDR-processed NdFeB powders |
| topic | General Physics and Astronomy |
| url | http://dx.doi.org/10.1063/1.5005047 |