About this Materials Science article
Increased exchange interaction range by Fe substitution in Ni3-xFexAl: Evidence from critical behavior by Renwen Li is a Materials Science article available to read on EtoBox.
The critical behavior of Fe substituted intermetallic compounds Ni 3-x Fe x Al (x = 0, 0.18, and 0.36) has been investigated around the paramagnetic-ferromagnetic (PM-FM) phase transition based on the static magnetization data. Reliable critical exponents (β, γ, and δ) and transition temperature T C are determined for the compounds, by using Modified Arrott plot, Kouvel-Fisher plot, and critical isotherm plot. The self-consistence and reliability of the obtained critical exponents are further verified by the Widom scaling relation δ = 1 + γ/β and scaling equations of the state M(H,ε) = ε β f ± (H/ε β+γ ). It is found that, Fe substitution for Ni dramatically increases T C from 44.44 K for x = 0 to 301.20 K for x = 0.36. The critical exponents for the three compounds are all found to follow mean-field model. The exchange interaction J(r) is found to decay asr -4.657 , r -4.434 , and r -4.257 for x=0, 0.18 and 0.36, respectively. The results suggest that, a long range mean-field spin interaction dominates in Ni 3- x Fe x Al (0≤x≤0.36) series. Furthermore , Fe substitution to Ni site is found to increase the spin interaction distance to longer range.
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- Author
- Renwen Li
- Publisher
- Elsevier BV
- Published
- 2022
- Language
- EN
- Field
- Materials Science (Physical Sciences)