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Rare-earth/transition-metal magnetic interactions in pristine and (Ni,Fe)-doped YCo5 and GdCo5
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Patrick, Christopher E., Kumar, Santosh, Balakrishnan, Geetha, Edwards, R. S. (Rachel Sian), Lees, Martin R., Mendive-Tapia, Eduardo, Petit , Leon and Staunton, Julie B. (2017) Rare-earth/transition-metal magnetic interactions in pristine and (Ni,Fe)-doped YCo5 and GdCo5. Physical Review Materials, 1 (2). 024411 . doi:10.1103/PhysRevMaterials.1.024411 ISSN 2475-9953.
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WRAP-rare-earth-transition-metal-magnetic-interactions-pristine-Patrick-2017.pdf - Accepted Version - Requires a PDF viewer. Download (1669Kb) | Preview |
Official URL: https://doi.org/10.1103/PhysRevMaterials.1.024411
Abstract
We present an investigation into the intrinsic magnetic properties of the compounds YCo5 and GdCo5, members of the RETM5 class of permanent magnets (RE = rare earth, TM = transition metal). Focusing on Y and Gd provides direct insight into both the TM magnetization and RE-TM interactions without the complication of strong crystal field effects. We synthesize single crystals of YCo5 and GdCo5 using the optical floating zone technique and measure the magnetization from liquid helium temperatures up to 800 K. These measurements are interpreted through calculations based on a Green’s function formulation of density-functional theory, treating the thermal disorder of the local magnetic moments within the coherent potential approximation. The rise in magnetization with temperature of GdCo5 is shown to arise from a faster disordering of the Gd magnetic moments compared to the antiferromagnetically-aligned Co sublattice. We use the calculations to analyze the different Curie temperatures of the compounds and also compare the molecular (Weiss) fields at the RE site with previously-published neutron scattering experiments. To gain further insight into the RE-TM interaction we perform substitutional doping on the TM site, studying the compounds RECo4.5Ni0.5, RECo4Ni and RECo4.5Fe0.5. Both our calculations and experiments on powdered samples find an increased/decreased magnetization with Fe/Ni-doping respectively. The calculations further reveal a pronounced dependence on the location of the dopant atoms of both the Curie temperatures and the Weiss field at the RE site
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Rare earth metals -- Magnetic properties, Transition metals -- Magnetic properties, Permanent magnets | ||||||
| Journal or Publication Title: | Physical Review Materials | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 2475-9953 | ||||||
| Official Date: | 31 July 2017 | ||||||
| Dates: |
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| Volume: | 1 | ||||||
| Number: | 2 | ||||||
| Article Number: | 024411 | ||||||
| DOI: | 10.1103/PhysRevMaterials.1.024411 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Date of first compliant deposit: | 11 July 2017 | ||||||
| Date of first compliant Open Access: | 31 July 2018 | ||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Science and Technology Facilities Council (Great Britain) (STFC) | ||||||
| Grant number: | EP/M028941/1 (EPSRC) |
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