Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys
The temperature dependence of magnetocrystalline anisotropy was investigated in detail for the polycrystalline Ni<sub>50</sub>Mn<sub>25</sub>Ga<sub>25</sub>, Ni<sub>50</sub>Mn<sub>25</sub>Ga<sub>20</sub>Ti<sub>5</sub>...
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MDPI AG
2020-06-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/13/2906 |
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| author | Amadeusz Łaszcz Mariusz Hasiak Jerzy Kaleta |
| author_facet | Amadeusz Łaszcz Mariusz Hasiak Jerzy Kaleta |
| author_sort | Amadeusz Łaszcz |
| collection | DOAJ |
| description | The temperature dependence of magnetocrystalline anisotropy was investigated in detail for the polycrystalline Ni<sub>50</sub>Mn<sub>25</sub>Ga<sub>25</sub>, Ni<sub>50</sub>Mn<sub>25</sub>Ga<sub>20</sub>Ti<sub>5</sub> and Ni<sub>50</sub>Mn<sub>25</sub>Ga<sub>20</sub>Gd<sub>5</sub> ferromagnetic shape memory alloys in the temperature range of 50–400 K. The effective anisotropy constant was estimated from a series of high field magnetization curves based on the fitting procedure according to the law of approach to magnetic saturation. The low temperature martensitic phase was found to have a significantly higher anisotropy energy in comparison to a high temperature austenitic phase, which was observed through a sudden, distinct drop of anisotropy energy. The calculated values of the effective anisotropy constant were comparable to the results published by other authors. Moreover, the strong influence of chemical composition on the first-order phase transition and the second-order ferromagnetic to the paramagnetic transition was revealed. Finally, the strong coupling between the temperature dependence of the coercive field and the temperature dependence of magnetocrystalline anisotropy was also shown and discussed in the present study. |
| first_indexed | 2024-03-10T18:49:55Z |
| format | Article |
| id | doaj.art-f8cee87316604da3acac479ba0ca16e4 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T18:49:55Z |
| publishDate | 2020-06-01 |
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| spelling | doaj.art-f8cee87316604da3acac479ba0ca16e42023-11-20T05:13:43ZengMDPI AGMaterials1996-19442020-06-011313290610.3390/ma13132906Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory AlloysAmadeusz Łaszcz0Mariusz Hasiak1Jerzy Kaleta2Department of Mechanics, Materials and Biomedical Engineering, Wrocław University of Science and Technology, 25 Smoluchowskiego, 50-370 Wrocław, PolandDepartment of Mechanics, Materials and Biomedical Engineering, Wrocław University of Science and Technology, 25 Smoluchowskiego, 50-370 Wrocław, PolandDepartment of Mechanics, Materials and Biomedical Engineering, Wrocław University of Science and Technology, 25 Smoluchowskiego, 50-370 Wrocław, PolandThe temperature dependence of magnetocrystalline anisotropy was investigated in detail for the polycrystalline Ni<sub>50</sub>Mn<sub>25</sub>Ga<sub>25</sub>, Ni<sub>50</sub>Mn<sub>25</sub>Ga<sub>20</sub>Ti<sub>5</sub> and Ni<sub>50</sub>Mn<sub>25</sub>Ga<sub>20</sub>Gd<sub>5</sub> ferromagnetic shape memory alloys in the temperature range of 50–400 K. The effective anisotropy constant was estimated from a series of high field magnetization curves based on the fitting procedure according to the law of approach to magnetic saturation. The low temperature martensitic phase was found to have a significantly higher anisotropy energy in comparison to a high temperature austenitic phase, which was observed through a sudden, distinct drop of anisotropy energy. The calculated values of the effective anisotropy constant were comparable to the results published by other authors. Moreover, the strong influence of chemical composition on the first-order phase transition and the second-order ferromagnetic to the paramagnetic transition was revealed. Finally, the strong coupling between the temperature dependence of the coercive field and the temperature dependence of magnetocrystalline anisotropy was also shown and discussed in the present study.https://www.mdpi.com/1996-1944/13/13/2906magnetic shape memory alloysmultifunctional alloysNi-Mn-Gamagnetocrystalline anisotropy |
| spellingShingle | Amadeusz Łaszcz Mariusz Hasiak Jerzy Kaleta Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys Materials magnetic shape memory alloys multifunctional alloys Ni-Mn-Ga magnetocrystalline anisotropy |
| title | Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys |
| title_full | Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys |
| title_fullStr | Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys |
| title_full_unstemmed | Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys |
| title_short | Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys |
| title_sort | temperature dependence of anisotropy in ti and gd doped nimnga based multifunctional ferromagnetic shape memory alloys |
| topic | magnetic shape memory alloys multifunctional alloys Ni-Mn-Ga magnetocrystalline anisotropy |
| url | https://www.mdpi.com/1996-1944/13/13/2906 |
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