Crystal structure and magnetism of the Mn x Ga (1.15 ≤x ≤ 2.0) rare-earth-free permanent magnet system

Room temperature neutron powder diffraction has been used to investigate the chemical structure and magnetic ordering of a series of tetragonal (I4/mmm #139) Mn x Ga (1.15 ≤ x ≤ 2.0) alloys. Initially (x < 1.5) the excess Mn goes on the 2b site with vacancies appearing at the 2a site. For x >...

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Bibliographic Details
Published in:AIP advances 2016-05, Vol.6 (5)
Main Authors: Rejali, Rasa, Ryan, D. H., Altounian, Z., Boyer, C.B., Lu, Qingmei, Wang, Manli, Zhang, Hongguo, Yue, Ming
Format: Article
Language:English
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Summary:Room temperature neutron powder diffraction has been used to investigate the chemical structure and magnetic ordering of a series of tetragonal (I4/mmm #139) Mn x Ga (1.15 ≤ x ≤ 2.0) alloys. Initially (x < 1.5) the excess Mn goes on the 2b site with vacancies appearing at the 2a site. For x > 1.5 Mn also appears on the 2a site. The manganese atoms on the 4d site carry an almost constant moment of 2.16(6) μB /Mn. The loss of magnetisation seen with increasing Mn content is shown to be the result of large (∼3 μB /Mn), antiparallel Mn moments on the 2b, and later 2a sites, and not to a reduction of the Mn moment on the 4d sites.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4942557