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Calculating the magnetic anisotropy of rare-earth/transition-metal ferrimagnets
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Patrick, Christopher E., Kumar, Santosh, Balakrishnan, Geetha, Edwards, R. S. (Rachel Sian), Lees, Martin R., Petit, Leon and Staunton, Julie B. (2018) Calculating the magnetic anisotropy of rare-earth/transition-metal ferrimagnets. Physical Review Letters, 120 (9). 097202. doi:10.1103/PhysRevLett.120.097202 ISSN 1079-7114.
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Official URL: https://doi.org/10.1103/PhysRevLett.120.097202
Abstract
Magnetocrystalline anisotropy, the microscopic origin of permanent magnetism, is often explained in terms of ferromagnets. However, the best performing permanent magnets based on rare earths and transition metals (RE-TM) are in fact \emph{ferri}magnets, consisting of a number of magnetic sublattices. Here we show how a naive calculation of the magnetocrystalline anisotropy of the classic RE-TM ferrimagnet GdCo5 gives numbers which are too large at 0~K and exhibit the wrong temperature dependence. We solve this problem by introducing a first-principles approach to calculate temperature-dependent magnetization vs.field (\FPMvB) curves, mirroring the experiments actually used to determine the anisotropy. We pair our calculations with measurements on a recently-grown single crystal of GdCo5, and find excellent agreement. The \FPMvB approach demonstrates a new level of sophistication in the use of first-principles calculations to understand RE-TM magnets.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Library of Congress Subject Headings (LCSH): | Rare earths -- Magnetic properties, Transition metals -- Magnetic properties, Ferrimagnetism | ||||||||||||
Journal or Publication Title: | Physical Review Letters | ||||||||||||
Publisher: | American Physical Society | ||||||||||||
ISSN: | 1079-7114 | ||||||||||||
Official Date: | 2 March 2018 | ||||||||||||
Dates: |
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Volume: | 120 | ||||||||||||
Number: | 9 | ||||||||||||
Article Number: | 097202 | ||||||||||||
DOI: | 10.1103/PhysRevLett.120.097202 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Date of first compliant deposit: | 13 February 2018 | ||||||||||||
Date of first compliant Open Access: | 20 June 2018 | ||||||||||||
RIOXX Funder/Project Grant: |
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