Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4

Rasmus Toft-Petersen; Manfred Reehuis; Thomas B S Jensen; Niels H. Andersen; Jiying Li; Manh Duc Le; Mark Laver; Christof Niedermayer; Bastian Klemke; Kim Lefmann; David Vaknin

doi:10.1103/PhysRevB.92.024404

Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO₄

Rasmus Toft-Petersen^*, Manfred Reehuis, Thomas B S Jensen, Niels H. Andersen, Jiying Li, Manh Duc Le, Mark Laver, Christof Niedermayer, Bastian Klemke, Kim Lefmann, David Vaknin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

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.

Original language	English
Article number	024404
Journal	Physical Review B
Volume	92
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.92.024404
Publication status	Published - 6 Jul 2015
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Electronic, Optical and Magnetic Materials

Access to Document

10.1103/PhysRevB.92.024404

Cite this

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title = "Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4",

abstract = "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.",

author = "Rasmus Toft-Petersen and Manfred Reehuis and Jensen, {Thomas B S} and Andersen, {Niels H.} and Jiying Li and Le, {Manh Duc} and Mark Laver and Christof Niedermayer and Bastian Klemke and Kim Lefmann and David Vaknin",

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T1 - Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4

AU - Toft-Petersen, Rasmus

AU - Reehuis, Manfred

AU - Jensen, Thomas B S

AU - Andersen, Niels H.

AU - Li, Jiying

AU - Le, Manh Duc

AU - Laver, Mark

AU - Niedermayer, Christof

AU - Klemke, Bastian

AU - Lefmann, Kim

AU - Vaknin, David

PY - 2015/7/6

Y1 - 2015/7/6

N2 - 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.

AB - 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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