Near-room temperature ferromagnetism and a tunable anomalous Hall effect in atomically thin Fe 4 CoGeTe 2
Source abstract
Abstract
Itinerant ferromagnetism at room temperature is a key factor for spin transport and manipulation. Here, we report the realization of near-room temperature itinerant ferromagnetism in Co doped Fe5GeTe2 thin flakes. The ferromagnetic transition temperature TC (∼323 K-337 K) is almost unchanged when the thickness is as low as 12 nm and is still about 284 K at 2 nm (bilayer thickness). Theoretical calculations further indicate that the ferromagnetism persists in monolayer Fe4CoGeTe2. In addition to the robust ferromagnetism down to the ultrathin limit, Fe4CoGeTe2 exhibits an unusual temperature- and thickness-dependent intrinsic anomalous Hall effect. We propose that it could be ascribed to the dependence of the band structure on thickness that changes the Berry curvature near the Fermi energy level subtly. The near-room temperature ferromagnetism and tunable anomalous Hall effect in atomically thin Fe4CoGeTe2 provide opportunities to understand the exotic transport properties of two-dimensional van der Waals magnetic materials and explore their potential applications in spintronics.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: 2D Materials and Applications · Iron-based superconductors research · Chalcogenide Semiconductor Thin Films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & MicroNano Devices, Renmin University of China, Beijing 100872, China
Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China, Beijing 100872, China
Anhui Key Laboratory of Magnetic Functional Materials and Devices, School of Materials Science and Engineering, Anhui University, Hefei 230601, China
State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Center for Spintronics, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
Funding
National Basic Research Program of China · Natural Science Foundation of Beijing Municipality · National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities · Renmin University of China · National Research Foundation of Korea
References (59)
Show source-provided references
1. Novoselov · Science · 2004 · 306 · 66610.1126/science.1102896 ↗
2. Mak · Science · 2014 · 344 · 148910.1126/science.1250140 ↗
3. Satto · Nat. Rev. Mater. · 2017 · 2 · 1609410.1038/natrevmats.2016.94 ↗
4. Geim · Nature · 2013 · 499 · 41910.1038/nature12385 ↗
5. Novoselov · Science · 2016 · 353 · aac943910.1126/science.aac9439 ↗
6. Liu · Nat. Rev. Mater. · 2016 · 1 · 1604210.1038/natrevmats.2016.42 ↗
7. Mermin · Phys. Rev. Lett. · 1966 · 17 · 113310.1103/PhysRevLett.17.1133 ↗
8. Gong · Nature · 2017 · 546 · 26510.1038/nature22060 ↗
9. Huang · Nature · 2017 · 546 · 27010.1038/nature22391 ↗
10. Gibertini · Nat. Nanotechnol. · 2019 · 14 · 40810.1038/s41565-019-0438-6 ↗
11. O'Hara · Nano Lett. · 2018 · 18 · 312510.1021/acs.nanolett.8b00683 ↗
12. Bonilla · Nat. Nanotechnol. · 2018 · 13 · 28910.1038/s41565-018-0063-9 ↗
13. Wang · ACS Nano · 2021 · 15 · 1623610.1021/acsnano.1c05232 ↗
14. Zhang · Adv. Mater. · 2019 · 31 · 190005610.1002/adma.201900056 ↗
15. Sun · Nano Res. · 2020 · 13 · 335810.1007/s12274-020-3021-4 ↗
16. Wang · Nanoscale · 2020 · 12 · 1642710.1039/D0NR04108D ↗
17. Zhang · Nat. Commun. · 2021 · 12 · 249210.1038/s41467-021-22777-x ↗
18. Wen · Nano Lett. · 2020 · 20 · 313010.1021/acs.nanolett.9b05128 ↗
19. May · Phys. Rev. B · 2016 · 93 · 01441110.1103/PhysRevB.93.014411 ↗
20. May · ACS Nano · 2019 · 13 · 443610.1021/acsnano.8b09660 ↗
21. May · Phys. Rev. Mater. · 2019 · 3 · 10440110.1103/PhysRevMaterials.3.104401 ↗
22. Deng · Nature · 2018 · 563 · 9410.1038/s41586-018-0626-9 ↗
23. Fei · Nat. Mater. · 2018 · 17 · 77810.1038/s41563-018-0149-7 ↗
24. Seo · Sci. Adv. · 2020 · 6 · eaay891210.1126/sciadv.aay8912 ↗
25. Tan · Nano Lett. · 2021 · 21 · 559910.1021/acs.nanolett.1c01108 ↗
26. Li · Adv. Mater. · 2022 · 34 · 202201209
27. Zhang · Nat. Commun. · 2022 · 13 · 506710.1038/s41467-022-32605-5 ↗
28. Daniel · Nano Lett. · 2019 · 19 · 503110.1021/acs.nanolett.9b01287 ↗
29. Chen · Phys. Rev. Lett. · 2022 · 128 · 21720310.1103/PhysRevLett.128.217203 ↗
30. Stahl · Z. Anorg. Allg. Chem. · 2018 · 644 · 192310.1002/zaac.201800456 ↗
31. Tian · Appl. Phys. Lett. · 2020 · 116 · 20240210.1063/5.0006337 ↗
32. May · Phys. Rev. Mater. · 2020 · 4 · 07400810.1103/PhysRevMaterials.4.074008 ↗
33. May · 2D Mater. · 2022 · 9 · 01501310.1088/2053-1583/ac34d9 ↗
34. Chen · ACS Appl. Mater. Interfaces · 2023 · 15 · 328710.1021/acsami.2c18028 ↗
35. Chen · J. Phys. Soc. Jpn. · 2013 · 82 · 12471110.7566/JPSJ.82.124711 ↗
36. Ohno · Phys. Rev. Lett. · 1992 · 68 · 266410.1103/PhysRevLett.68.2664 ↗
37. Blöchl · Phys. Rev. B: Condens. Matter Mater. Phys. · 1994 · 50 · 1795310.1103/PhysRevB.50.17953 ↗
38. Kresse · Phys. Rev. B: Condens. Matter Mater. Phys. · 1999 · 59 · 175810.1103/PhysRevB.59.1758 ↗
39. Kresse · Phys. Rev. B: Condens. Matter Mater. Phys. · 1993 · 47 · 55810.1103/PhysRevB.47.558 ↗
40. Kresse · Phys. Rev. B: Condens. Matter Mater. Phys. · 1996 · 54 · 1116910.1103/PhysRevB.54.11169 ↗
41. Perdew · Phys. Rev. Lett. · 1996 · 77 · 386510.1103/PhysRevLett.77.3865 ↗
42. Monkhorst · Phys. Rev. B: Solid State · 1976 · 13 · 518810.1103/PhysRevB.13.5188 ↗
43. Grimme · J. Comput. Chem. · 2006 · 27 · 178710.1002/jcc.20495 ↗
44. Wu · J. Chem. Phys. · 2001 · 115 · 874810.1063/1.1412004 ↗
45. Wu · Comput. Phys. Commun. · 2018 · 224 · 40510.1016/j.cpc.2017.09.033 ↗
46. Mostofi · Comput. Phys. Commun. · 2014 · 185 · 230910.1016/j.cpc.2014.05.003 ↗
47. Arrott · Phys. Rev. · 1957 · 108 · 139410.1103/PhysRev.108.1394 ↗
48. Ohno · Nature · 2000 · 408 · 94410.1038/35050040 ↗
49. Chiba · Nat. Mater. · 2011 · 10 · 85310.1038/nmat3130 ↗
50. Zheng · Microsc. Microanal. · 2019 · 25 · 95610.1017/S1431927619005518 ↗
51. Nagaosa · Rev. Mod. Phys. · 2010 · 82 · 153910.1103/RevModPhys.82.1539 ↗
52. Wang · Nat. Commun. · 2018 · 9 · 368110.1038/s41467-018-06088-2 ↗
53. Sales · Phys. Rev. B: Condens. Matter Mater. Phys. · 2006 · 73 · 22443510.1103/PhysRevB.73.224435 ↗
54. Lee · Phys. Rev. B: Condens. Matter Mater. Phys. · 2007 · 75 · 17240310.1103/PhysRevB.75.172403 ↗
55. Zeng · Phys. Rev. Lett. · 2006 · 96 · 03720410.1103/PhysRevLett.96.037204 ↗
56. Stoner · Philos. Trans. R. Soc., A · 1948 · 240 · 599
57. Okamoto · Phys. Rev. B: Condens. Matter Mater. Phys. · 2002 · 66 · 02441310.1103/PhysRevB.66.024413 ↗
58. Fang · Science · 2003 · 302 · 9210.1126/science.1089408 ↗
59. Mathieu · Phys. Rev. Lett. · 2004 · 93 · 01660210.1103/PhysRevLett.93.016602 ↗