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Large uniaxial magnetostriction with sign inversion at the first order phase transition in the nanolaminated Mn2GaC MAX phase

Large uniaxial magnetostriction with sign inversion at the first order phase transition in the nanolaminated Mn2GaC MAX phase


Titill: Large uniaxial magnetostriction with sign inversion at the first order phase transition in the nanolaminated Mn2GaC MAX phase
Höfundur: Novoselova, Iuliia P.
Petruhins, Andrejs
Wiedwald, Ulf
Ingason, Árni Sigurdur
Hase, Thomas
Magnus, Fridrik   orcid.org/0000-0003-2606-8559
Kapaklis, Vassilios
Palisaitis, Justinas
Spasova, Marina
Farle, Michael
... 2 fleiri höfundar Sýna alla höfunda
Útgáfa: 2018-02-08
Tungumál: Enska
Háskóli/Stofnun: Háskóli Íslands
University of Iceland
Svið: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Deild: Raunvísindastofnun (HÍ)
Science Institute (UI)
Birtist í: Scientific Reports;8(1)
ISSN: 2045-2322
DOI: 10.1038/s41598-018-20903-2
Efnisorð: Electronic properties and materials; Magnetic properties and materials; Phase transitions and critical phenomena; Eðlisfræði; Segulmagn; Rafeindafræði
URI: https://hdl.handle.net/20.500.11815/749

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Tilvitnun:

Novoselova, I. P., Petruhins, A., Wiedwald, U., Ingason, Á. S., Hase, T., Magnus, F., . . . Salikhov, R. (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-

Útdráttur:

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.

Leyfi:

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