Anisotropy of antiferromagnetic 180° domains in magnetoelectric LiMPO4 (M = Fe, Co, Ni)

Zimmermann, A.; Aken, B.B. van; Schmid, Hans; Rivera, Jean-Pierre; Li, J.; Vaknin, David; Fiebig, Manfred

doi:10.1140/epjb/e2009-00223-3

Cited by 30 publications

(28 citation statements)

References 18 publications

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“…1a and Supplementary Fig. 1 confirms their coupling to this structure 35 . At the photon energies used in the present experiment, the SHG yield from T y is at least two orders of magnitude smaller than that from T z and can thus be neglected.…”

Section: Shg Tensor Componentssupporting

confidence: 63%

Ferroic nature of magnetic toroidal order

2014

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Electric dipoles and ferroelectricity violate spatial inversion symmetry, and magnetic dipoles and ferromagnetism break time-inversion symmetry. Breaking both symmetries favours magnetoelectric charge-spin coupling effects of enormous interest, such as multiferroics, skyrmions, polar superconductors, topological insulators or dynamic phenomena such as electromagnons. Extending the rationale, a novel type of ferroic order violating spaceand time-inversion symmetry with a single order parameter should exist. This existence is fundamental and the inherent magnetoelectric coupling is technologically interesting. A uniform alignment of magnetic vortices, called ferrotoroidicity, was proposed to represent this state. Here we demonstrate that the magnetic vortex pattern identified in LiCoPO 4 exhibits the indispensable hallmark of such a ferroic state, namely hysteretic poling of ferrotoroidic domains in the conjugate toroidal field, along with a distinction of toroidal from non-toroidal poling effects. This consolidates ferrotoroidicity as fourth form of ferroic order.

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Section: Shg Tensor Componentssupporting

confidence: 63%

Ferroic nature of magnetic toroidal order

2014

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“…24 Here, we report on the exact polarization of this additional spin component and an observed zero field spin canting in LiFePO 4 . Although these additional spin components are minor, they are shown in this work to enable a magneto-electric response via the DM interaction.…”

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confidence: 83%

Anomalous magnetic structure and spin dynamics in magnetoelectricLiFePO4

et al. 2015

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We report significant details of the magnetic structure and spin dynamics of LiFePO4 by single crystal neutron scattering. Our results confirm a previously reported co-linear rotation of the spins away from the principal b axis and determine that the rotation is towards 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 magneto-electric (ME) effect is analyzed. Inelastic neutron scattering along the three principal directions reveal 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 hard c axis. It is shown that both next-nearest neighbour (NNN) exchange couplings in the bc plane are in competition with the strongest nearest neighbour (NN) coupling.

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“…The irreversibility attributed to the formation of magnetic domains and domain-wall movement was observed in some layered transition metal compounds, for example in Fe(III) hydroxy phosphate [59]. Recently, using optical second harmonic generation, the authors of [60] observed a domain structure in LiMPO 4 (M¼ Fe, Co, Ni) and found the domains distribution to be isotropic with a weak coupling between the magnetic moments and the crystallographic lattice. This shows that a domain structure can be formed also in the isostructural lithium manganese phosphate.…”

Section: Magnetic Order Inmentioning

confidence: 99%