Magnetism and Magnetoelectricity in the Lithium Orthophosphates

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• Technical University of Denmark
• Friday 08 March 2019, 14:00-15:00
• Physics East 217.

If you have a question about this talk, please contact Mingee Chung.

Some materials display the magnetoelectric effect where an electric polarization is induced by applying a magnetic field or vice versa, a magnetization is induced by an electric field. This intimate coupling between electric and magnetic properties render magnetoelectric materials interesting for applications in for example data storage and sensors. However, despite half a century of research on such materials, an all-embracing fundamental understanding is still being pieced together.

The lithium orthophosphates, LiMPO4 (M = Co, Ni, Fe, Mn), are a family of compounds with antiferromagnetic and magnetoelectric ground states [1-3] as well as complex magnetic phase diagrams [4-7]. We study their magnetic and magnetoelectric properties by means of magnetization, electric polarization and neutron scattering experiments and we discover new phases up to a staggering 42 T. Furthermore, we investigate how the magnetoelectric effect is affected by mixing different ions on the magnetic site and perform Monte Carlo simulations in order to elucidate the interplay and competition of exchange interactions and single-ion anisotropies in the system.

In studying the magnetic and magnetoelectric properties of the lithium orthophosphates we thus aim to explain the origin of the magnetoelectric effect in this family of compounds and ultimately to contribute to the overall understanding of the phenomenon.

[1] Santoro et al., J. Phys. Chem. Solids. 27, 1192-1193 (1966) [2] Santoro et al. Acta Cryst. 22, 344-347 (1967) [3] Newnham et al. J. Phys. Chem. Solids. 26, 445-447 (1965) [4] Fogh et al., Phys. Rev. B 96 , 104420 (2017) [5] Toft-Petersen et al., Phys. Rev. B 84 , 054408 (2011) [6] Toft-Petersen et al., Phys. Rev. B 92 , 024404 (2015) [7] Toft-Petersen et al., Phys. Rev. B 85 , 224415 (2012)

This talk is part of the Condensed Matter Physics Seminars series.

This talk is included in these lists:

• Bham Talks
• Cond. Mat. seminar
• Condensed Matter Physics Seminars
• Physics East 217
• What's on in Physics?

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