Remarkable Magnetic Properties in a Mn<sub>73.6</sub>Ga<sub>26.4</sub> Alloy Produced via Out-of-Equilibrium Method
Rare-earth-free permanent magnets with the L1<sub>0</sub> phase are actively researched for their potential as a future class of magnetic materials, capable of operating at higher temperatures and in challenging corrosion environments such as renewable energy applications. Among these cl...
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MDPI AG
2023-11-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/23/3014 |
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| author | Ovidiu Crisan Alina Daniela Crisan |
| author_facet | Ovidiu Crisan Alina Daniela Crisan |
| author_sort | Ovidiu Crisan |
| collection | DOAJ |
| description | Rare-earth-free permanent magnets with the L1<sub>0</sub> phase are actively researched for their potential as a future class of magnetic materials, capable of operating at higher temperatures and in challenging corrosion environments such as renewable energy applications. Among these classes, MnGa shows potential, being cost effective and having interesting magnetic properties. A MnGa magnetic alloy, with composition Mn<sub>73.6</sub>Ga<sub>26.4</sub> in atomic percent, was produced via the out-of-equilibrium method, and its structural and magnetic properties were assessed using X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and extended magnetic characterization. We show that the MnGa alloy submitted to thermal annealing in optimal conditions exhibits a two-phase microstructure, where small nanocrystals of tetragonal L1<sub>0</sub>/D0<sub>22</sub> magnetic phase are embedded within a D0<sub>19</sub> MnGa matrix of a non-collinear antiferromagnetic nature. These co-existing, magnetically different phases produce an optimal set of promising magnetic properties, larger than the values reported in the literature for single-phase MnGa alloys and thin films. Such large values are explained by the exchange coupling between competing non-collinear magnetic sublattices of the D0<sub>19</sub> MnGa with the net moment of the small magnetic nanocrystals of tetragonal symmetry. |
| first_indexed | 2024-03-09T01:45:54Z |
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| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T01:45:54Z |
| publishDate | 2023-11-01 |
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| spelling | doaj.art-54bf1c2d690248a5acfa7fb36be063502023-12-08T15:22:54ZengMDPI AGNanomaterials2079-49912023-11-011323301410.3390/nano13233014Remarkable Magnetic Properties in a Mn<sub>73.6</sub>Ga<sub>26.4</sub> Alloy Produced via Out-of-Equilibrium MethodOvidiu Crisan0Alina Daniela Crisan1National Institute for Materials Physics, P.O. Box MG-7, 077125 Magurele, Ilfov, RomaniaNational Institute for Materials Physics, P.O. Box MG-7, 077125 Magurele, Ilfov, RomaniaRare-earth-free permanent magnets with the L1<sub>0</sub> phase are actively researched for their potential as a future class of magnetic materials, capable of operating at higher temperatures and in challenging corrosion environments such as renewable energy applications. Among these classes, MnGa shows potential, being cost effective and having interesting magnetic properties. A MnGa magnetic alloy, with composition Mn<sub>73.6</sub>Ga<sub>26.4</sub> in atomic percent, was produced via the out-of-equilibrium method, and its structural and magnetic properties were assessed using X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and extended magnetic characterization. We show that the MnGa alloy submitted to thermal annealing in optimal conditions exhibits a two-phase microstructure, where small nanocrystals of tetragonal L1<sub>0</sub>/D0<sub>22</sub> magnetic phase are embedded within a D0<sub>19</sub> MnGa matrix of a non-collinear antiferromagnetic nature. These co-existing, magnetically different phases produce an optimal set of promising magnetic properties, larger than the values reported in the literature for single-phase MnGa alloys and thin films. Such large values are explained by the exchange coupling between competing non-collinear magnetic sublattices of the D0<sub>19</sub> MnGa with the net moment of the small magnetic nanocrystals of tetragonal symmetry.https://www.mdpi.com/2079-4991/13/23/3014MnGa tetragonal phaserare earth free magnetsmagnetic properties |
| spellingShingle | Ovidiu Crisan Alina Daniela Crisan Remarkable Magnetic Properties in a Mn<sub>73.6</sub>Ga<sub>26.4</sub> Alloy Produced via Out-of-Equilibrium Method Nanomaterials MnGa tetragonal phase rare earth free magnets magnetic properties |
| title | Remarkable Magnetic Properties in a Mn<sub>73.6</sub>Ga<sub>26.4</sub> Alloy Produced via Out-of-Equilibrium Method |
| title_full | Remarkable Magnetic Properties in a Mn<sub>73.6</sub>Ga<sub>26.4</sub> Alloy Produced via Out-of-Equilibrium Method |
| title_fullStr | Remarkable Magnetic Properties in a Mn<sub>73.6</sub>Ga<sub>26.4</sub> Alloy Produced via Out-of-Equilibrium Method |
| title_full_unstemmed | Remarkable Magnetic Properties in a Mn<sub>73.6</sub>Ga<sub>26.4</sub> Alloy Produced via Out-of-Equilibrium Method |
| title_short | Remarkable Magnetic Properties in a Mn<sub>73.6</sub>Ga<sub>26.4</sub> Alloy Produced via Out-of-Equilibrium Method |
| title_sort | remarkable magnetic properties in a mn sub 73 6 sub ga sub 26 4 sub alloy produced via out of equilibrium method |
| topic | MnGa tetragonal phase rare earth free magnets magnetic properties |
| url | https://www.mdpi.com/2079-4991/13/23/3014 |
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