Electrical and Magnetic Transport Properties of Co<sub>2</sub>VGa Half-Metallic Heusler Alloy
This study performed a systematic experimental investigation into the structural, magnetic, and transport properties of the Co<sub>2</sub>VGa Heusler alloy, which was theoretically predicted to exhibit half-metallic ferromagnetism. It has been experimentally found that the studied alloy...
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MDPI AG
2022-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/17/6138 |
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| author | Litao Yu Zhe Li Jiajun Zhu Hongwei Liu Yuanlei Zhang Yiming Cao Kun Xu Yongsheng Liu |
| author_facet | Litao Yu Zhe Li Jiajun Zhu Hongwei Liu Yuanlei Zhang Yiming Cao Kun Xu Yongsheng Liu |
| author_sort | Litao Yu |
| collection | DOAJ |
| description | This study performed a systematic experimental investigation into the structural, magnetic, and transport properties of the Co<sub>2</sub>VGa Heusler alloy, which was theoretically predicted to exhibit half-metallic ferromagnetism. It has been experimentally found that the studied alloy has a relatively high-ordered <i>L</i>2<sub>1</sub> cubic structure at room temperature and orders ferromagnetically below ~350 K. Interestingly, by fitting the electric transport data with the properly governing equations in two different temperature regions, the two-magnon scattering process (the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi>T</mi><mrow><mn>9</mn><mo>/</mo><mn>2</mn></mrow></msup></mrow></semantics></math></inline-formula> dependence) appears in the temperature range from 30 to 75 K. Moreover, the magnetoresistance effect changes from a negative value to a positive value when the temperature is below 100 K. Such experimental findings provide indirect evidence that the half-metallic nature of this alloy is retained only when the temperature is below 100 K. On the other hand, the magnetic transport measurements indicate that the anomalous Hall coefficient of this alloy increases when the temperature increases and reaches a relatively high value (~8.3 μΩ·cm/T) at 300 K due to its lower saturated magnetization. By analyzing the anomalous Hall resistivity scale with the longitudinal resistivity, it was also found that the anomalous Hall effect can be ascribed to the combined effect of extrinsic skew scattering and intrinsic Berry curvature, but the latter contribution plays a dominant role. |
| first_indexed | 2024-03-10T01:35:03Z |
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| id | doaj.art-f20fb484d14d4e0783afebfb952704ae |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:35:03Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-f20fb484d14d4e0783afebfb952704ae2023-11-23T13:36:14ZengMDPI AGMaterials1996-19442022-09-011517613810.3390/ma15176138Electrical and Magnetic Transport Properties of Co<sub>2</sub>VGa Half-Metallic Heusler AlloyLitao Yu0Zhe Li1Jiajun Zhu2Hongwei Liu3Yuanlei Zhang4Yiming Cao5Kun Xu6Yongsheng Liu7Department of Physics, Shanghai University of Electric Power, Shanghai 200090, ChinaCenter for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, ChinaYunnan Zhongruans Liquid Metal Technology Co., Ltd., Qujing 655400, ChinaCenter for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, ChinaCenter for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, ChinaCenter for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, ChinaCenter for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, ChinaDepartment of Physics, Shanghai University of Electric Power, Shanghai 200090, ChinaThis study performed a systematic experimental investigation into the structural, magnetic, and transport properties of the Co<sub>2</sub>VGa Heusler alloy, which was theoretically predicted to exhibit half-metallic ferromagnetism. It has been experimentally found that the studied alloy has a relatively high-ordered <i>L</i>2<sub>1</sub> cubic structure at room temperature and orders ferromagnetically below ~350 K. Interestingly, by fitting the electric transport data with the properly governing equations in two different temperature regions, the two-magnon scattering process (the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi>T</mi><mrow><mn>9</mn><mo>/</mo><mn>2</mn></mrow></msup></mrow></semantics></math></inline-formula> dependence) appears in the temperature range from 30 to 75 K. Moreover, the magnetoresistance effect changes from a negative value to a positive value when the temperature is below 100 K. Such experimental findings provide indirect evidence that the half-metallic nature of this alloy is retained only when the temperature is below 100 K. On the other hand, the magnetic transport measurements indicate that the anomalous Hall coefficient of this alloy increases when the temperature increases and reaches a relatively high value (~8.3 μΩ·cm/T) at 300 K due to its lower saturated magnetization. By analyzing the anomalous Hall resistivity scale with the longitudinal resistivity, it was also found that the anomalous Hall effect can be ascribed to the combined effect of extrinsic skew scattering and intrinsic Berry curvature, but the latter contribution plays a dominant role.https://www.mdpi.com/1996-1944/15/17/6138Heusler alloyhalf-metallic ferromagnetismanomalous Hall effect |
| spellingShingle | Litao Yu Zhe Li Jiajun Zhu Hongwei Liu Yuanlei Zhang Yiming Cao Kun Xu Yongsheng Liu Electrical and Magnetic Transport Properties of Co<sub>2</sub>VGa Half-Metallic Heusler Alloy Materials Heusler alloy half-metallic ferromagnetism anomalous Hall effect |
| title | Electrical and Magnetic Transport Properties of Co<sub>2</sub>VGa Half-Metallic Heusler Alloy |
| title_full | Electrical and Magnetic Transport Properties of Co<sub>2</sub>VGa Half-Metallic Heusler Alloy |
| title_fullStr | Electrical and Magnetic Transport Properties of Co<sub>2</sub>VGa Half-Metallic Heusler Alloy |
| title_full_unstemmed | Electrical and Magnetic Transport Properties of Co<sub>2</sub>VGa Half-Metallic Heusler Alloy |
| title_short | Electrical and Magnetic Transport Properties of Co<sub>2</sub>VGa Half-Metallic Heusler Alloy |
| title_sort | electrical and magnetic transport properties of co sub 2 sub vga half metallic heusler alloy |
| topic | Heusler alloy half-metallic ferromagnetism anomalous Hall effect |
| url | https://www.mdpi.com/1996-1944/15/17/6138 |
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