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Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Magnetic Heusler Compounds

MA 24.6: Vortrag

Dienstag, 17. März 2020, 10:45–11:00, HSZ 403

Magnetic structure dependence on plate thickness in Mn1.4PtSn single crystals — •Belen Zuniga1,2, Peter Milde1, Praveen Vir2, Markus König2, Claudia Felser2, Andrew Mackenzie2, and Lukas Eng11IAP, TU Dresden, 01187 Dresden, Germany — 2MPI CPfS, 01187 Dresden, Germany

Materials with D2d crystal symmetry potentially host a variety of different magnetic textures such as spin spirals or antiskyrmions, as theoretically predicted [1,2]. Mn1.4PtSn is an acentric tetragonal Heusler compound that possesses such a symmetry and, furthermore, a helical ground state as well as an antiskyrmion lattice at room temperature when applying a small magnetic field [3].

We show that the ab-plane of bulk Mn1.4PtSn exhibits ferromagnetic order, with high anisotropy and self-organization of domains. Applying magnetic force microscopy (MFM) we are able to discern magnetic structures with sizes ranging from ∼ 10 µ m down to ∼ 100 nm. Preparing ultra-thin single-crystalline Mn1.4PtSn samples, we find a critical sample thickness of 4.5 µ m, below which the fractal-like magnetic domain patterns change into magnetic lamellar structures with submicron periodicity. Under a magnetic field, a lattice of bubble-like domains is induced into these crystalline thinned Mn1.4PtSn samples, similar to skyrmion lattices that we have investigated by MFM [4,5]. References: [1] Bogdanov and Yablonskii, Sov. Phys. JETP 68 (1989) 101. [2] Koshibae and Nagaosa, Nat. Commun. 7 (2016) 10542. [3] Nayak et al., Nature 548 (2017) 561. [4] Milde et al., Science 340 (2013) 6136. [5] Készmárki et al., Nat. Mater. 14 (2015) 1116.

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