Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Magnetic Textures: Statics and Imaging II

MA 41.14: Vortrag

Donnerstag, 4. April 2019, 13:00–13:15, H37

Nanoscale magnetic structure dependence on plate thickness in Mn1,4PtSn single crystals — •Belen Zuniga1,2, Peter Milde1, Praveen Vir2, Markus König2, Lukas Eng1, Claudia Felser2, and Andy Mackenzie21Institute of Applied Physics, TU Dresden, Dresden, Germany. — 2Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany.

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

Here we show that the ab-plane of bulk Mn1,4PtSn exhibits ferromagnetic order, with high anisotropy and self-organization of the magnetic domains, hosting magnetic structures over a broad range of sizes, ranging from ∼ 10 µ m down to ∼ 100 nm. Moreover, when 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 abruptly change into magnetic lamellar structures with sub-micrometer periodicity. When applying a magnetic field, a regular lattice of bubble-like domains is induced into these crystalline thin-plate Mn1,4PtSn samples.

References: [1] A.N. Bogdanov and D.A. Yablonskii, Sov. Phys. JETP 68 (1989) 101. [2] W. Koshibae and N. Nagaosa, Nat. Commun. 7 (2016) 10542. [3] A.K. Nayak et al., Nature 548 (2017) 561.

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