The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI<sub>2</sub> Heterostructures
The manipulation of valley splitting has potential applications in valleytronics, which lacks in pristine two-dimensional (2D) InSe. Here, we demonstrate that valley physics in InSe can be activated via the magnetic proximity effect exerted by ferromagnetic FeI<sub>2</sub> substrate with...
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MDPI AG
2020-08-01
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| Series: | Nanomaterials |
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| author | Yifeng Lin Changcheng Zhang Lixiu Guan Zhipeng Sun Junguang Tao |
| author_facet | Yifeng Lin Changcheng Zhang Lixiu Guan Zhipeng Sun Junguang Tao |
| author_sort | Yifeng Lin |
| collection | DOAJ |
| description | The manipulation of valley splitting has potential applications in valleytronics, which lacks in pristine two-dimensional (2D) InSe. Here, we demonstrate that valley physics in InSe can be activated via the magnetic proximity effect exerted by ferromagnetic FeI<sub>2</sub> substrate with spin-orbit coupling. The valley splitting energy can reach 48 meV, corresponding to a magnetic exchange field of ~800 T. The system also presents magnetic anisotropy behavior with its easy magnetization axis tunable from in-plane to out-of-plane by the stacking configurations and biaxial tensile strain. The <i>d</i>-orbital-resolved magnetic anisotropic energy contributions indicate that the tensile strain effect arises from the increase of hybridization between minority Fe <i>d<sub>xy</sub></i> and <inline-formula><math display="inline"><semantics><mrow><msub><mi>d</mi><mrow><msup><mi>x</mi><mn>2</mn></msup><mo>−</mo><msup><mi>y</mi><mn>2</mn></msup></mrow></msub></mrow></semantics></math></inline-formula> states. Our results reveal that the magnetic proximity effect is an effective approach to stimulate the valley properties in InSe to extend its spintronic applications, which is expected to be feasible in other group-III monochalcogenides. |
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| last_indexed | 2024-03-10T17:01:30Z |
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| spelling | doaj.art-010caffa22ba420a9f9e5f1b2697f75e2023-11-20T10:56:31ZengMDPI AGNanomaterials2079-49912020-08-01109164210.3390/nano10091642The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI<sub>2</sub> HeterostructuresYifeng Lin0Changcheng Zhang1Lixiu Guan2Zhipeng Sun3Junguang Tao4School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, ChinaSchool of Science, Hebei University of Technology, Tianjin 300401, ChinaSchool of Science, Hebei University of Technology, Tianjin 300401, ChinaSchool of Science, Hebei University of Technology, Tianjin 300401, ChinaSchool of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, ChinaThe manipulation of valley splitting has potential applications in valleytronics, which lacks in pristine two-dimensional (2D) InSe. Here, we demonstrate that valley physics in InSe can be activated via the magnetic proximity effect exerted by ferromagnetic FeI<sub>2</sub> substrate with spin-orbit coupling. The valley splitting energy can reach 48 meV, corresponding to a magnetic exchange field of ~800 T. The system also presents magnetic anisotropy behavior with its easy magnetization axis tunable from in-plane to out-of-plane by the stacking configurations and biaxial tensile strain. The <i>d</i>-orbital-resolved magnetic anisotropic energy contributions indicate that the tensile strain effect arises from the increase of hybridization between minority Fe <i>d<sub>xy</sub></i> and <inline-formula><math display="inline"><semantics><mrow><msub><mi>d</mi><mrow><msup><mi>x</mi><mn>2</mn></msup><mo>−</mo><msup><mi>y</mi><mn>2</mn></msup></mrow></msub></mrow></semantics></math></inline-formula> states. Our results reveal that the magnetic proximity effect is an effective approach to stimulate the valley properties in InSe to extend its spintronic applications, which is expected to be feasible in other group-III monochalcogenides.https://www.mdpi.com/2079-4991/10/9/1642InSemagnetic proximity effectfirst-principles calculationsspin-orbit coupling |
| spellingShingle | Yifeng Lin Changcheng Zhang Lixiu Guan Zhipeng Sun Junguang Tao The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI<sub>2</sub> Heterostructures Nanomaterials InSe magnetic proximity effect first-principles calculations spin-orbit coupling |
| title | The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI<sub>2</sub> Heterostructures |
| title_full | The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI<sub>2</sub> Heterostructures |
| title_fullStr | The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI<sub>2</sub> Heterostructures |
| title_full_unstemmed | The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI<sub>2</sub> Heterostructures |
| title_short | The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI<sub>2</sub> Heterostructures |
| title_sort | magnetic proximity effect induced large valley splitting in 2d inse fei sub 2 sub heterostructures |
| topic | InSe magnetic proximity effect first-principles calculations spin-orbit coupling |
| url | https://www.mdpi.com/2079-4991/10/9/1642 |
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