Wide temperature span of entropy change in first-order metamagnetic MnCo1-xFexSi
- Xu, J. H.
- Yang, W. Y.
- Du, Q. H.
- Xia, Y. H.
- Du, H. L.
- Yang, J. B.
- Wang, C. S.
- Han, J. Z.
- Liu, S. Q.
- Zhang, Y.
- Yang, Y. C.
DOIAbstract
The crystal structure and magnetic properties of MnCoxFe1-xSi (x = 0-0.5) compounds were investigated. With increasing Fe content, the unit cell changes anisotropically and the magnetic property evolves gradually: Curie temperature decreases continuously, the first-order metamagnetic transition from a low-temperature helical antiferromagnetic (AFM) state to a high-temperature ferromagnetic state disappears gradually and then a spin-glass-like state and another AFM state emerge in the low-temperature region. The Curie transition leads to a moderate conventional entropy change. The metamagnetic transition not only yields a larger negative magnetocaloric effect at lower applied fields than in MnCoSi but also produces a very large temperature s...
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