Experimental and Theoretical Investigations of Fe-Doped Hexagonal MnNiGe.
S Shanmukharao SamathamAkhilesh Kumar PatelAshish Kumar MishraAleksey V LukoyanovLyubov N GramateevaArchana LakhaniGanesan VedachalaiyerSuresh Krishnawarrier Gopinatha WarrierPublished in: ACS omega (2022)
We report a comprehensive investigation of MnNi 0.7 Fe 0.3 Ge Heusler alloy to explore its magnetic, caloric, and electrical transport properties. The alloy undergoes a ferromagnetic transition across T C ∼ 212 K and a weak-antiferromagnetic transition across T t ∼ 180 K followed by a spin-glass transition below T f ∼ 51.85 K. A second-order phase transition across T C with mixed short and long-range magnetic interactions is confirmed through the critical exponent study and universal scaling of magnetic entropy and magnetoresistance. A weak first-order phase transition is evident across T t from magnetization and specific heat data. The frequency dependent cusp in χ AC ( T ) along with the absence of a clear magnetic transition in specific heat C ( T ) and resistivity ρ( T ) establish the spin glass behavior below T f . Mixed ferromagnetic and antiferromagnetic interactions with dominant ferromagnetic coupling, as revealed by density functional calculations, are experimentally evident from the large positive Weiss temperature, magnetic saturation, and negative magnetic-entropy and magnetoresistance.
Keyphrases
- molecularly imprinted
- room temperature
- density functional theory
- heat stress
- molecular dynamics
- single molecule
- electronic health record
- machine learning
- mass spectrometry
- solid phase extraction
- metal organic framework
- molecular dynamics simulations
- high resolution
- deep learning
- artificial intelligence
- ionic liquid
- highly efficient
- visible light