DPG Phi
Verhandlungen
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DPG

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. Sukhanov1,5, Igor V. Morozov2,3, Saicharan Aswartham3, and Helen C. Walker41TU 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.

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