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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/7777

Title: Experimental observation of magnetic poles inside
Authors: Périgo, EA
Gilbert, EP
Metlov, KL
Michels, A
Keywords: NEUTRONS
SPIN
MAGNETS
ANISOTROPY
FOURIER ANALYSIS
EXPERIMENT PLANNING
Issue Date: 15-Dec-2014
Publisher: IOP Science
Citation: Périgo, E. A., Gilbert, E. P., Metlov, K. L. , Michels, A. . (2014 ). Experimental observation of magnetic poles inside bulk magnets via Fourier modes of magnetostatic field. New Journal of Physics, 16(12), 123031. doi: http://dx.doi.org/10.1088/1367-2630/16/12/123031
Abstract: The pole-avoidance principle of magnetostatics results in an angular anisotropy of the magnetic neutron scattering cross section dΣM dΩ. For the case of a sintered Nd–Fe–B permanent magnet, we report the experimental observation of a ‘spike’ in dΣM dΩ 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 q ≠ 0 Fourier modes of the magnetostatic field. Thus, our observation proves the existence of such modes.© 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
URI: http://dx.doi.org/10.1088/1367-2630/16/12/123031
http://apo.ansto.gov.au/dspace/handle/10238/7777
ISSN: 1367-2630
Appears in Collections:Journal Articles

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