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Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4

TitleAnomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4
Publication TypeJournal Article
Year of Publication2015
AuthorsToft-Petersen, R, Reehuis, M, Jensen, TBS, Andersen, NH, Li, JY, Le, MD, Laver, M, Niedermayer, C, Klemke, B, Lefmann, K, Vaknin, D
JournalPhysical Review B
Date Published07
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000357485100008
Keywordsbattery, capacity, cathode, crystal, diffraction, ferroelectricity, licopo4, linipo4, mechanism, multiferroics

We report significant details of the magnetic structure and spin dynamics of LiFePO4 obtained by single-crystal neutron scattering. Our results confirm a previously reported collinear rotation of the spins away from the principal b axis, and they determine that the rotation is toward the a axis. In addition, we find a significant spin-canting component along c. The possible causes of these components are discussed, and their significance for the magnetoelectric effect is analyzed. Inelastic neutron scattering along the three principal directions reveals a highly anisotropic hard plane consistent with earlier susceptibility measurements. Using a spin Hamiltonian, we show that the spin dimensionality is intermediate between XY- and Ising-like, with an easy b axis and a hard c axis. It is shown that both next-nearest neighbor exchange couplings in the bc plane are in competition with the strongest nearest neighbor coupling.

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