Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic field
The pole-avoidance principle of magnetostatics results in an angular anisotropy of the magnetic neutron scattering cross section ${\rm d}{{\Sigma }_{M}}/{\rm d}\Omega $ . For the case of a sintered Nd–Fe–B permanent magnet, we report the experimental observation of a ‘spike’ in ${\rm d}{{\Sigma }_{M...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2014-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/16/12/123031 |
| _version_ | 1797751421297229824 |
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| author | Élio A Périgo Elliot P Gilbert Konstantin L Metlov Andreas Michels |
| author_facet | Élio A Périgo Elliot P Gilbert Konstantin L Metlov Andreas Michels |
| author_sort | Élio A Périgo |
| collection | DOAJ |
| description | The pole-avoidance principle of magnetostatics results in an angular anisotropy of the magnetic neutron scattering cross section ${\rm d}{{\Sigma }_{M}}/{\rm d}\Omega $ . For the case of a sintered Nd–Fe–B permanent magnet, we report the experimental observation of a ‘spike’ in ${\rm d}{{\Sigma }_{M}}/{\rm d}\Omega $ along the forward direction. The spike implies the presence of long-wavelength magnetization fluctuations on a length scale of at least 60 nm. Using micromagnetic theory, it is shown that this type of angular anisotropy is the result of the presence of unavoidable magnetic poles in the bulk of the magnet and is related to the ${\bf q}\ne 0$ Fourier modes of the magnetostatic field. Thus, our observation proves the existence of such modes. |
| first_indexed | 2024-03-12T16:48:16Z |
| format | Article |
| id | doaj.art-1d53a82abe114b048986deaa8e38f0f1 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:48:16Z |
| publishDate | 2014-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-1d53a82abe114b048986deaa8e38f0f12023-08-08T11:26:40ZengIOP PublishingNew Journal of Physics1367-26302014-01-01161212303110.1088/1367-2630/16/12/123031Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic fieldÉlio A Périgo0Elliot P Gilbert1Konstantin L Metlov2Andreas Michels3Physics and Materials Science Research Unit, University of Luxembourg , 162A Avenue de la Faïencerie, L-1511 Luxembourg, LuxembourgBragg Institute , ANSTO, Locked Bag 2001, Kirrawee DC, NSW 2232, AustraliaDonetsk Institute for Physics and Technology NAS , Donetsk 83114, UkrainePhysics and Materials Science Research Unit, University of Luxembourg , 162A Avenue de la Faïencerie, L-1511 Luxembourg, LuxembourgThe pole-avoidance principle of magnetostatics results in an angular anisotropy of the magnetic neutron scattering cross section ${\rm d}{{\Sigma }_{M}}/{\rm d}\Omega $ . For the case of a sintered Nd–Fe–B permanent magnet, we report the experimental observation of a ‘spike’ in ${\rm d}{{\Sigma }_{M}}/{\rm d}\Omega $ along the forward direction. The spike implies the presence of long-wavelength magnetization fluctuations on a length scale of at least 60 nm. Using micromagnetic theory, it is shown that this type of angular anisotropy is the result of the presence of unavoidable magnetic poles in the bulk of the magnet and is related to the ${\bf q}\ne 0$ Fourier modes of the magnetostatic field. Thus, our observation proves the existence of such modes.https://doi.org/10.1088/1367-2630/16/12/123031magnetic neutron scatteringmagnetodipolar interactionspin-ice compounds61.05.fg75.25.-j |
| spellingShingle | Élio A Périgo Elliot P Gilbert Konstantin L Metlov Andreas Michels Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic field New Journal of Physics magnetic neutron scattering magnetodipolar interaction spin-ice compounds 61.05.fg 75.25.-j |
| title | Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic field |
| title_full | Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic field |
| title_fullStr | Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic field |
| title_full_unstemmed | Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic field |
| title_short | Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic field |
| title_sort | experimental observation of magnetic poles inside bulk magnets via fourier modes of magnetostatic field |
| topic | magnetic neutron scattering magnetodipolar interaction spin-ice compounds 61.05.fg 75.25.-j |
| url | https://doi.org/10.1088/1367-2630/16/12/123031 |
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