Revealing the mystery of the cases where Nd–Fe–B magnetic like poles attract each other
Abstract This investigation reveals the mystery of the cases where magnetic like poles attract each other, and unlike poles repel one another. It is identified that for two unequally sized like poles, the pole with a higher P c (permeance coefficient) causes a localized demagnetization (LD) to the p...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2021-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-91969-8 |
| _version_ | 1818461283246145536 |
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| author | Hui Meng Guiping Tang Abby Shen Michelle Qian Qifeng Wei George Mizzell Christina H. Chen |
| author_facet | Hui Meng Guiping Tang Abby Shen Michelle Qian Qifeng Wei George Mizzell Christina H. Chen |
| author_sort | Hui Meng |
| collection | DOAJ |
| description | Abstract This investigation reveals the mystery of the cases where magnetic like poles attract each other, and unlike poles repel one another. It is identified that for two unequally sized like poles, the pole with a higher P c (permeance coefficient) causes a localized demagnetization (LD) to the pole with a lower P c . If the LD is large enough, the polarity of a localized area can be reversed, resulting in an attraction between these two like poles in the LD area in a small gap. Two unusual behaviors are observed: (1) an inflection point IP appears on the force vs gap curves of all the unequally sized like poles since they have different P c . Normally, the like poles’ repelling force increases when the gap decreases, but this IP results in nonmonotonic curves, even an attractive force in a small gap; (2) for some NdFeB magnets with a low coercivity and nonlinear B–H curve in the 2nd quadrant, a repulsion can occur for these unequal sized unlike poles, after previously pairing with their like poles that left an unrecoverable LD and reversed polarity area. The relationship of the LD, the P c ratio, and the B–H curve are also explored in this paper. |
| first_indexed | 2024-12-14T23:43:41Z |
| format | Article |
| id | doaj.art-374798c5efba4b7ba0569dee45ca34fa |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-14T23:43:41Z |
| publishDate | 2021-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-374798c5efba4b7ba0569dee45ca34fa2022-12-21T22:43:27ZengNature PortfolioScientific Reports2045-23222021-06-0111111010.1038/s41598-021-91969-8Revealing the mystery of the cases where Nd–Fe–B magnetic like poles attract each otherHui Meng0Guiping Tang1Abby Shen2Michelle Qian3Qifeng Wei4George Mizzell5Christina H. Chen6Foresee GroupQuadrant at HangzhouQuadrant at San JoseQuadrant at San JoseForesee GroupSuperMagnetManQuadrant at San JoseAbstract This investigation reveals the mystery of the cases where magnetic like poles attract each other, and unlike poles repel one another. It is identified that for two unequally sized like poles, the pole with a higher P c (permeance coefficient) causes a localized demagnetization (LD) to the pole with a lower P c . If the LD is large enough, the polarity of a localized area can be reversed, resulting in an attraction between these two like poles in the LD area in a small gap. Two unusual behaviors are observed: (1) an inflection point IP appears on the force vs gap curves of all the unequally sized like poles since they have different P c . Normally, the like poles’ repelling force increases when the gap decreases, but this IP results in nonmonotonic curves, even an attractive force in a small gap; (2) for some NdFeB magnets with a low coercivity and nonlinear B–H curve in the 2nd quadrant, a repulsion can occur for these unequal sized unlike poles, after previously pairing with their like poles that left an unrecoverable LD and reversed polarity area. The relationship of the LD, the P c ratio, and the B–H curve are also explored in this paper.https://doi.org/10.1038/s41598-021-91969-8 |
| spellingShingle | Hui Meng Guiping Tang Abby Shen Michelle Qian Qifeng Wei George Mizzell Christina H. Chen Revealing the mystery of the cases where Nd–Fe–B magnetic like poles attract each other Scientific Reports |
| title | Revealing the mystery of the cases where Nd–Fe–B magnetic like poles attract each other |
| title_full | Revealing the mystery of the cases where Nd–Fe–B magnetic like poles attract each other |
| title_fullStr | Revealing the mystery of the cases where Nd–Fe–B magnetic like poles attract each other |
| title_full_unstemmed | Revealing the mystery of the cases where Nd–Fe–B magnetic like poles attract each other |
| title_short | Revealing the mystery of the cases where Nd–Fe–B magnetic like poles attract each other |
| title_sort | revealing the mystery of the cases where nd fe b magnetic like poles attract each other |
| url | https://doi.org/10.1038/s41598-021-91969-8 |
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