| Autor: |
Pal, Lakhan, Suresh, K. G., Nigam, A. K. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Mar2013, Vol. 113 Issue 9, p093904-093904-7, 1p, 1 Diagram, 3 Charts, 8 Graphs |
| Abstrakt: |
Effect of partial Mn substitution for Fe in Fe3Si on the structural, magnetic, transport, and magnetotransport properties has been studied. Mn substitution is found to induce a re-entrant antiferromagnetic phase at low temperatures. The increase in the antiferromagnetic exchange causes a gradual decrease in the Curie temperature and the saturation magnetization. Temperature dependence of the electrical resistivity data shows that the high temperature resistivity is dominated by electron-phonon scattering, while below the re-entry temperature (TR), electron-magnon scattering is dominant. These results are in agreement with the reported spin polarization studies and indicate that the reentrant behavior is detrimental to half metallicity. Application of a field causes negative magnetoresistance (MR) above TR. However, at 5 K, the magnetoresistance is found to be positive, with the magnitude increasing with x. For x > 0.8, field induced irreversibility has been found in MR vs. field isotherms at 5 K, which indicates that the re-entrant phase has competing magnetic interactions. Canted magnetic structure known to exist in this system is assumed to be responsible for this anomalous behaviour. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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