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MA: Fachverband Magnetismus
MA 56: Multiferroics and Magnetoelectric coupling II (joint session MA/KFM)
MA 56.7: Vortrag
Freitag, 5. April 2019, 11:00–11:15, H39
High magnetic field phases of magnetoelectric LiFePO4 and LiNiPO4 — •Botond Forrai1, Atsuhiko Miyata2, Dávid Szaller3, Vilmos Kocsis4, Yasujiro Taguchi4, Yoshinori Tokura4, István Kézsmárki5, and Sándor Bordács1 — 1Department of Physics, Budapest University of Technology and Economics, Budapest 1111, Hungary — 2Laboratoire National des Champs Magnetiques Intenses, Toulouse 31400, France — 3Institute of Solid State Physics, Vienna University of Technology, Vienna 1040, Austria — 4RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan — 5Zentrum für Elektronsiche Korrelation und Magnetismus, Institut für Physik, Universität Augsburg
Olivine-type orthophosphates has been attracting much attention due to their strong linear magnetoelectric effect. The low-field magnetic phases giving rise to the magnetoelelctric effect are well charachterized, however, their high field phase diagrams have not been fully explored. Therefore, we studied the magnetic phases of LiFePO4 and LiNiPO4 at 5K by magnetization measurements till their magnetization reach the saturation. The competing exchange interactions leads to several phase transitions in LiNiPO4, while in LiFePO4 a single spin-flop transition is detected due to the strong anisotropy. The magnetic phase diagrams are interpreted in a classical mean-field model, which allowed us to identify the key terms in spin Hamiltonian.