Crystal structure and magnetism of the MnxGa (1.15 ≤x ≤ 2.0) rare-earth-free permanent magnet system
Source abstract
Abstract
Room temperature neutron powder diffraction has been used to investigate the chemical structure and magnetic ordering of a series of tetragonal (I4/mmm #139) MnxGa (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.
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Research context
OpenAlex topics: Magnetic Properties of Alloys · Magnetic properties of thin films · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
McGill University 1 Physics Department and Centre for the Physics of Materials, , 3600 University Street, Montreal, Quebec, H3A 2T8, Canada
Canadian Neutron Beam Centre 2 , Chalk River Laboratories, Ontario, K0J 1J0, Canada
Beijing University of Technology 3 College of Materials Science and Engineering, , Beijing 100122, China
Funding
Natural Sciences and Engineering Research Council of Canada
References (6)
Show source-provided references
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