Influence of low Co substitution on magnetoelastic properties of HoFe11Ti intermetallic compound |
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Authors: | L. Motevalizadeh N. Tajabor D. Sanavi Khoshnoud D. Fruchart F. Pourarian |
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Affiliation: | 1. Department of Physics, Mashhad Branch, Islamic Azad University, Mashhad, Iran;2. Department of Physics, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran;3. Department of Physics, Semnan University, Semnan 35195-363, Iran;4. Institut. Néel, Département MCMF, Groupe IICF, BP 166, 38042 Grenoble Cedex 9, France;5. Department of Material Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA |
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Abstract: | The thermal expansion and magnetostriction of HoFe11−xCoxTi (x=0, 0.3, 0.7 and 1) intermetallic compounds were measured, using the strain gauge method in the temperature range 77–590 K under applied magnetic fields up to 1.5 T. Results show that for samples with x=0 and 0.3, both linear thermal expansion and linear thermal expansion coefficient exhibit anomalies below the Curie temperature. Below room temperature, the spontaneous volume magnetostriction decreases with Co content. For all compounds studied, the anisotropic magnetostriction shows similar behaviour in the measured temperature range. The magnetostriction compensation occurs above room temperature in all samples. The volume magnetostriction shows a linear dependence on the applied field and by approaching the Curie temperature this trend changes to parastrictive behaviour. The results of the spontaneous magnetostriction are discussed based on the local magnetic moment model. The contribution of magnetostriction attributed to the magnetic sublattices R and T (Fe or Co) is discussed. |
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Keywords: | HoFe11&minus xCoxTi Thermal expansion Magnetostriction Magnetovolume effect |
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