Correlation of Berry phase transport with the topological magnetic textures in Heusler compounds: From the bulk to the thin-film limit

Left: Schematic of an antiskyrmion. Right: Antiskyrmion lattice in Mn1.4Pt0.9Pd0.1Sn as revealed through Lorentz transmission electron microscopy [2].

The magnetic spins of atoms arrange in multiple configurations, in which the simplest one gives rise to conventional magnets. However, complex configurations can arise in two and three dimensions that can be visualized as a topological swirling of the magnetic texture, setting a recent example of skyrmions. The materials that host such features has come to the forefront of research in chemistry and physics as a potential candidate for the generation of modern technology [1,2]. The Heusler compounds are one of the potential candidates due to various crystal structures and large tunability by chemical substitution, where the topological states can be easily realized. Detail experimental and theoretical investigations are necessary to realize more real space magnetic textures. It is thus the goal of this project to utilize and further develop advanced spatial imaging techniques in transmission electron microscopy (TEM) and holography [4,5] to characterize the magnetic structures of both bulk single crystals and thin film [3]. The student will conduct the TEM investigations, shall reconstruct the 3D magnetic structure of the samples from the experimentally obtained images, and conduct micromagnetic simulations in order to interpret the results. In collaboration with groups at the MPI CPfS, the findings shall be correlated with the transport properties of the investigated materials. The project will be a joint effort of the TU Dresden, the MPI CPfS, and the IFW Dresden.

Moreover, there is the possibility for a supplementary and complementary theoretical project in collaboration with the experiment, in order to predict the most viable compounds, and to develop the computational methods to treat such rich magnetic materials.

[2] A. K. Nayak, V. Kumar, T. Ma, P. Werner, E. Pippel, R. Sahoo, F. Damay, U. K. Rößler, C. Felser, and S.S.P. Parkin
Magnetic antiskyrmions above room temperature in tetragonal Heusler materials
Nature 548, 561 (2017)
[1] K. Manna, Y. Sun, L. Muechler, J. Kübler, and C. Felser
Heusler, Weyl and Berry
Nat. Rev. Mater. 3, 244 (2018)
[3] P. Vir, N. Kumar, H. Borrmann, B. Jamijansuren, G. Kreiner, C. Shekhar, and C. Felser
Tetragonal Superstructure of the Antiskyrmion Hosting Heusler Compound Mn1.4PtSn
Chem. Mater. 31, 5876 (2019)
[4] S. Schneider, D. Wolf, M. J. Stolt, S. Jin, D. Pohl, B. Rellinghaus, M. Schmidt, B. Büchner, S. T. B. Goennenwein, K. Nielsch, and A. Lubk
Induction Mapping of the 3D-Modulated Spin Texture of Skyrmions in Thin Helimagnets
Phys. Rev. Lett. 120, 217201 (2018)
[5] D. Wolf, N. Biziere, S. Sturm, D. Reyes, T. Wade, T. Niermann, J. Krehl, B. Warot-fonrose, B. Büchner, E. Snoeck, C. Gatel, and A. Lubk
Holographic vector field electron tomography of three-dimensional nanomagnets
Communications Physics 2, 87 (2019)

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