Spin chirality fluctuation in two-dimensional ferromagnets with perpendicular magnetic anisotropy
Source abstract
Abstract
Non-coplanar spin textures with scalar spin chirality can generate an effective magnetic field that deflects the motion of charge carriers, resulting in a topological Hall effect (THE)1-3. However, spin chirality fluctuations in two-dimensional ferromagnets with perpendicular magnetic anisotropy have not been considered so far. Here, we report evidence of spin chirality fluctuations by probing the THE above the Curie temperature in two different ferromagnetic ultra-thin films, SrRuO3 and V-doped Sb2Te3. The temperature, magnetic field, thickness and carrier-type dependence of the THE signal, along with Monte Carlo simulations, suggest that spin chirality fluctuations are a common phenomenon in two-dimensional ferromagnets with perpendicular magnetic anisotropy. Our results open a path for exploring spin chirality with topological Hall transport in two-dimensional magnets and beyond4-7.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · Multiferroics and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
Show source-provided references
1. Wen, X. G., Wilczek, F. & Zee, A. Chiral spin states and superconductivity. Phys. Rev. B 39, 11413–11423 (1989).10.1103/PhysRevB.39.11413 ↗
2. Taguchi, Y., Oohara, Y., Yoshizawa, H., Nagaosa, N. & Tokura, Y. Spin chirality, Berry phase, and anomalous Hall effect in a frustrated ferromagnet. Science 291, 2573–2576 (2001).10.1126/science.1058161 ↗
3. Neubauer, A. et al. Topological Hall effect in the A phase of MnSi. Phys. Rev. Lett. 102, 186602 (2009).10.1103/PhysRevLett.102.186602 ↗
4. Bonilla, M. et al. Strong room-temperature ferromagnetism in VSe2 monolayers on van der Waals substrates. Nat. Nanotechnol. 13, 289–293 (2018).10.1038/s41565-018-0063-9 ↗
5. Fei, Z. et al. Two-dimensional itinerant ferromagnetism in atomically thin Fe3GeTe2. Nat. Mater. 17, 778–782 (2018).10.1038/s41563-018-0149-7 ↗
6. Deng, Y. J. et al. Gate-tunable room-temperature ferromagnetism in two-dimensional Fe3GeTe2. Nature 563, 94–99 (2018).10.1038/s41586-018-0626-9 ↗
7. Machida, Y., Nakatsuji, S., Onoda, S., Tayama, T. & Sakakibara, T. Time-reversal symmetry breaking and spontaneous Hall effect without magnetic dipole order. Nature 463, 210–213 (2010).10.1038/nature08680 ↗
8. Nagaosa, N., Sinova, J., Onoda, S., MacDonald, A. H. & Ong, N. P. Anomalous Hall effect. Rev. Mod. Phys. 82, 1539–1592 (2010).10.1103/RevModPhys.82.1539 ↗
9. Zang, J., Mostovoy, M., Han, J. H. & Nagaosa, N. Dynamics of Skyrmion crystals in metallic thin films. Phys. Rev. Lett. 107, 136804 (2011).10.1103/PhysRevLett.107.136804 ↗
10. Kanazawa, N. et al. Large topological hall effect in a short-period helimagnet MnGe. Phys. Rev. Lett. 106, 156603 (2011).10.1103/PhysRevLett.106.156603 ↗
11. Huang, S. X. & Chien, C. L. Extended skyrmion phase in epitaxial FeGe(111) thin films. Phys. Rev. Lett. 108, 267201 (2012).10.1103/PhysRevLett.108.267201 ↗
12. Matl, P. et al. Hall effect of the colossal magnetoresistance manganite La1−xCaxMnO3. Phys. Rev. B 57, 10248–10251 (1998).10.1103/PhysRevB.57.10248 ↗
13. Ye, J. W. et al. Berry phase theory of the anomalous Hall effect: application to colossal magnetoresistance manganites. Phys. Rev. Lett. 83, 3737–3740 (1999).10.1103/PhysRevLett.83.3737 ↗
14. Chun, S. H., Salamon, M. B., Lyanda-Geller, Y., Goldbart, P. M. & Han, P. D. Magnetotransport in manganites and the role of quantal phases: theory and experiment. Phys. Rev. Lett. 84, 757–760 (2000).10.1103/PhysRevLett.84.757 ↗
15. Koster, G. et al. Structure, physical properties, and applications of SrRuO3 thin films. Rev. Mod. Phys. 84, 253–298 (2012).10.1103/RevModPhys.84.253 ↗
16. Chang, C.-Z. et al. High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator. Nat. Mater. 14, 473–477 (2015).10.1038/nmat4204 ↗
17. Thomas, S. et al. Localized control of Curie temperature in perovskite oxide film by capping-layer-induced octahedral distortion. Phys. Rev. Lett. 119, 177203 (2017).10.1103/PhysRevLett.119.177203 ↗
18. Klein, L. et al. Transport and magnetization in the badly metallic itinerant ferromagnet SrRuO3. J. Phys. Condens. Matter 8, 10111–10126 (1996).10.1088/0953-8984/8/48/026 ↗
19. Yasuda, K. et al. Geometric Hall effects in topological insulator heterostructures. Nat. Phys. 12, 555–559 (2016).10.1038/nphys3671 ↗
20. Matsuno, J. et al. Interface-driven topological Hall effect in SrRuO3-SrIrO3 bilayer. Science Adv. 2, e1600304 (2016).10.1126/sciadv.1600304 ↗
21. Liu, C. et al. Dimensional crossover-induced topological Hall effect in a magnetic topological insulator. Phys. Rev. Lett. 119, 176809 (2017).10.1103/PhysRevLett.119.176809 ↗
22. Fang, Z. et al. The anomalous Hall effect and magnetic monopoles in momentum space. Science 302, 92–96 (2003).10.1126/science.1089408 ↗
23. Hou, W.-T., Yu, J.-X., Daly, M. & Zang, J. Thermal driven topology in chiral magnets. Phys. Rev. B 96, 140403(R) (2017).10.1103/PhysRevB.96.140403 ↗
24. Böttcher, M., Heinze, S., Egorov, S., Sinova, J. & Dupe, B. B-T phase diagram of Pd/Fe/Ir(111) computed with parallel tempering Monte Carlo. New J. Phys. 20, 103014 (2018).10.1088/1367-2630/aae282 ↗
25. Hellwig, O., Berger, A., Kortright, J. B. & Fullerton, E. E. Domain structure and magnetization reversal of antiferromagnetically coupled perpendicular anisotropy films. J. Mag. Mag. Mater. 319, 13–55 (2007).10.1016/j.jmmm.2007.04.035 ↗
26. Dzyaloshinsky, I. A thermodynamic theory of ‘weak’ ferromagnetism of antiferromagnetics. J. Phys. Chem. Solids 4, 241–255 (1958).10.1016/0022-3697(58)90076-3 ↗
27. Moriya, T. Anisotropic superexchange interaction and weak ferromagnetism. Phys. Rev. 120, 91–98 (1960).10.1103/PhysRev.120.91 ↗
28. Rohart, S. & Thiaville, A. Skyrmion confinement in ultrathin film nanostructures in the presence of Dzyaloshinskii–Moriya interaction. Phys. Rev. B 88, 184422 (2013).10.1103/PhysRevB.88.184422 ↗
29. Hyun, S. & Char, K. Effects of strain on the dielectric properties of tunable dielectric SrTiO3 thin films. Appl. Phys. Lett. 79, 254 (2001).10.1063/1.1384893 ↗
30. Berg, B. & Luescher, M. Definition and statistical distributions of a topological number in the lattice O(3) σ-model. Nucl. Phys. B 190, 412–424 (1981).10.1016/0550-3213(81)90568-X ↗