Robust ferromagnetism in the compressed permanent magnet Sm2Co17

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Jeffries, J. R. ; Veiga, L. S. I. ; Fabbris, G. ; Haskel, D. ; Huang, P. ; Butch, N. P. ; McCall, S. K. ; Holliday, K. ; Jenei, Z. ; Xiao, Y. ; Chow, P.

• Tipo de documento: Artigo Científico
• Fonte: Physical Review B; v. 90, n. 10, p. 10-pg., 2014-09-08.

Resumo

The compound Sm2CO17 displays magnetic properties amenable to permanent magnet applications owing to both the 3d electrons of Co and the 4f electrons of Sm. The long-standing description of the magnetic interactions between the Sm and Co ions implies a truly ferromagnetic configuration, but some recent calculations challenge this axiom, suggesting at least a propensity for ferrimagnetic behavior. We have used high-pressure synchrotron x-ray techniques to characterize the magnetic and structural properties of Sm2Co17 to reveal a robust ferromagnetic state. The local Sm moment is at most weakly affected by compression, and the ordered moments show a surprising resilience to volumetric compressions of nearly 20%. Density functional theory calculations echo the magnetic robustness of Sm2Co17. (AU)

• Processo FAPESP: 13/14338-3 - Competição entre supercondutividade e magnetismo em sistemas sob pressão e filmes finos
• Beneficiário: Larissa Sayuri Ishibe Veiga
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado