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Structural and magnetic properties of GdCo5−xNix
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Tedstone, Amy L., Patrick, Christopher E., Kumar, Santosh, Edwards, R. S. (Rachel S.), Lees, Martin R., Balakrishnan, Geetha and Staunton, Julie B. (2019) Structural and magnetic properties of GdCo5−xNix. Physical Review Materials, 3 (3). 034409. doi:10.1103/PhysRevMaterials.3.034409 ISSN 2475-9953.
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Official URL: http://dx.doi.org/10.1103/PhysRevMaterials.3.03440...
Abstract
GdCo5 may be considered as two sublattices—one of Gd and one of Co—whose magnetizations are in antiparallel alignment, forming a ferrimagnet. Substitution of nickel in the cobalt sublattice of GdCo5 has been investigated to gain insight into how the magnetic properties of this prototype rare earth/transition-metal magnet are affected by changes in the transition-metal sublattice. Polycrystalline samples of GdCo5-xNix for 0 ≤ x ≤ 5 were synthesized by arc melting. Structural characterization was carried out by powder x-ray diffraction and optical and scanning electron microscope imagings of metallographic slides, the latter revealing a low concentration of Gd2(Co,Ni)7 lamellae for x ≤ 2.5. Compensation—i.e., the cancellation of the opposing Gd and transition-metal moments—is observed for 1< x < 3 at a temperature which increases with Ni content; for larger x , no compensation is observed below 360 K. A peak in the coercivity is seen at x ≈ 1 at 10 K coinciding with a minimum in the saturation magnetization. Density-functional theory calculations within the disordered local moment picture reproduce the dependence of the magnetization on Ni content and temperature. The calculations also show a peak in the magnetocrystalline anisotropy at similar Ni concentrations to the experimentally observed coercivity maximum.
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): | Ferrimagnetism, Magnetization, Cadmium -- Magnetic properties, Cobalt -- Magnetic properties | |||||||||
Journal or Publication Title: | Physical Review Materials | |||||||||
Publisher: | American Physical Society | |||||||||
ISSN: | 2475-9953 | |||||||||
Official Date: | 27 March 2019 | |||||||||
Dates: |
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Volume: | 3 | |||||||||
Number: | 3 | |||||||||
Article Number: | 034409 | |||||||||
DOI: | 10.1103/PhysRevMaterials.3.034409 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Copyright Holders: | ©2019 American Physical Society | |||||||||
Date of first compliant deposit: | 29 March 2019 | |||||||||
Date of first compliant Open Access: | 29 March 2019 | |||||||||
RIOXX Funder/Project Grant: |
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