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Large uniaxial magnetostriction with sign inversion at the first order phase transition in the nanolaminated Mn2GaC MAX phase
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Novoselova, Iuliia P., Petruhins, Andrejs, Wiedwald, Ulf, Ingason, Árni Sigurdur, Hase, Thomas P. A., Magnus, Fridrik, Kapaklis, Vassilios, Palisaitis, Justinas, Spasova, Marina, Farle, Michael, Rosen, Johanna and Salikhov, Ruslan (2018) Large uniaxial magnetostriction with sign inversion at the first order phase transition in the nanolaminated Mn2GaC MAX phase. Scientific Reports, 8 (1). 2637. doi:10.1038/s41598-018-20903-2 ISSN 2045-2322.
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Official URL: http://dx.doi.org/10.1038/s41598-018-20903-2
Abstract
In 2013, a new class of inherently nanolaminated magnetic materials, the so called magnetic MAX phases, was discovered. Following predictive material stability calculations, the hexagonal Mn2GaC compound was synthesized as hetero-epitaxial films containing Mn as the exclusive M-element. Recent theoretical and experimental studies suggested a high magnetic ordering temperature and non-collinear antiferromagnetic (AFM) spin states as a result of competitive ferromagnetic and antiferromagnetic exchange interactions. In order to assess the potential for practical applications of Mn2GaC, we have studied the temperature-dependent magnetization, and the magnetoresistive, magnetostrictive as well as magnetocaloric properties of the compound. The material exhibits two magnetic phase transitions. The Néel temperature is T N ~ 507 K, at which the system changes from a collinear AFM state to the paramagnetic state. At T t = 214 K the material undergoes a first order magnetic phase transition from AFM at higher temperature to a non-collinear AFM spin structure. Both states show large uniaxial c-axis magnetostriction of 450 ppm. Remarkably, the magnetostriction changes sign, being compressive (negative) above T t and tensile (positive) below the T t . The sign change of the magnetostriction is accompanied by a sign change in the magnetoresistance indicating a coupling among the spin, lattice and electrical transport properties.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Scientific Reports | ||||||
Publisher: | Nature Publishing Group | ||||||
ISSN: | 2045-2322 | ||||||
Official Date: | 8 February 2018 | ||||||
Dates: |
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Volume: | 8 | ||||||
Number: | 1 | ||||||
Article Number: | 2637 | ||||||
DOI: | 10.1038/s41598-018-20903-2 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published |
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