Peculiar behavior of V on the Curie temperature and anisotropy field of SmFe12-xVx compounds

P. Tozman*, T. Fukazawa, D. Ogawa, H. Sepehri-Amin, A. Bolyachkin, T. Miyake, S. Hirosawa, K. Hono, Y. K. Takahashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of V on the phase stability and intrinsic magnetic properties of SmFe12-xVx (0 ≤ x ≤ 1.9) thin films, and bulk SmFe12-xVx (x = 1.5 and 2) are investigated. It is found that V help to stabilize the ThMn12-type phase by decreasing the lattice parameters c and the c/a ratio up to its solid solubility limit x = 1.4. Above this limit, the formation of Sm-rich phase has been observed in the microstructure. Interestingly, Curie temperature (Tc) and anisotropy field (μ0Ha) do not exhibit the same trend with the magnetization (μ0Ms) where increasing V enhances the two quantities while decreasing the magnetization. The Tc increase from 533 K for x = 0 up to 660 K for x = 1 agrees with first principles calculation and it is related with the strengthening of the effect of Fe-V coupling along with its surrounding Fe-Fe couplings. Preservation of room temperature anisotropy field between 10 and 12 T is confirmed by micromagnetic simulation. In addition, V-substituted compounds demonstrate a higher μ0Ha than SmFe12 and Nd2Fe14B in the temperature range of 300–550 K. A comparison of the phase stabilizing elements M = Ti, Ti0.5V0.5, and V in SmFe11M1 reveals that V yields the highest μ0Ms, μ0Ha, and Tc. This study demonstrates that V-substituted compounds with 7 at.% phase stabilizers have more merit than Ti-substituted ones for the development of high-performance magnet with better extrinsic magnetic properties.

Original languageEnglish
Article number117928
JournalActa Materialia
Volume232
DOIs
Publication statusPublished - 2022 Jun 15
Externally publishedYes

Keywords

  • Bulk
  • Density functional theory
  • Magnetic properties
  • Micromagnetic simulation
  • SmFe12
  • Thin film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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