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Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 45: Magnetic Coupling and Spin Structures

MA 45.7: Talk

Thursday, March 14, 2013, 16:45–17:00, H10

57Fe NMR as a local probe for chiral ferromagnetism in non-centrosymmetric FeGe — •Michael Baenitz1, Panchanan Khuntia1, Markus Schmidt1, Ulrich Roessler2, and Heribert Wilhelm31Max-Planck-Institute for the Chemical Physics ofSolids, 01187 Dresden, Germany — 2Leibniz Institutefor Solid State and Materials Research - IFW, 01171 Dresden, Germany — 3Diamond Light Source Ltd, Didcot, OxfordshireOX11 0DE, United Kingdom

The helical ferromagnet FeGe belongs to the class of B20 compounds with non-centrosymmetric structure being essential for new forms of ferromagnetic phases (confined or modulated Skyrmion phase). From an NMR point FeGe is a prototype system to study chiral excitations directly "on-site" via the 57Fe nucleus which (in contrast to 55Mn with nuclear spin S=5/2) has a spin of S=1/2 with the big advantage of an absent quadrupolar interaction which usually creates broad NMR lines and prevents detailed investigations of the anisotropic Zeeman interaction in internal/external fields. 57Fe NMR opens up to probe the local susceptibility (hyperfine field), the dynamic susceptibility (spin lattice relaxation rate) and the spin-spin interaction directly "on site". Additionally the NMR line itself (its Fourier transform) provides information about the multiplicity of the Fe sites in the complex helimagnet. 57Fe NMR was performed on crushed single crystals of 57Fe enriched FeGe material between 2-300 K in zero and applied magnetic fields. Phase boundaries in the ordered state are identified and interestingly critical dynamics in the vicinity of these boundaries are obtained from the spin-lattice and spin-spin relaxation rate.

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