Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 54: Magnetic textures: Transport and dynamics III

MA 54.6: Talk

Friday, April 5, 2019, 10:45–11:00, H37

Magnetic excitations of the ferrimagnetic spin spiral in FeP — •Dmytro S. Inosov¹, Yuliia V. Tymoshenko¹, Yevhen A. Onykiienko¹, Alistair S. Cameron¹, Alexandr S. Sukhanov^1,5, Igor V. Morozov^2,3, Saicharan Aswartham³, and Helen C. Walker⁴ — ¹TU Dresden, Germany — ²Moscow State University, Russia — ³IFW Dresden, Germany — ⁴ISIS Neutron and Muon Source, Didcot, UK — ⁵MPI CPfS, Dresden, Germany

Iron phosphide (FeP) is a very unusual itinerant helimagnet, in which the spin spiral derives from a ferrimagnetic arrangement of spins ("double helix" structure). There are two magnetic sublattices with different sizes of the magnetic moment, which are twisted into a helical spiral propagating along the orthorhombic c axis. As a consequence, two nonequivalent pairs of incommensurate magnetic Bragg peaks with associated helimagnon modes form near the allowed and forbidden structural Bragg peaks (101) and (110), respectively. We present the first measurements of spin-wave excitations by inelastic neutron scattering and discuss the hierarchy and possible origin of magnetic interactions.