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  Polarizing an antiferromagnet by optical engineering of the crystal field

Disa, A., Fechner, M., Nova, T. F., Liu, B., Foerst, M., Prabhakaran, D., et al. (2020). Polarizing an antiferromagnet by optical engineering of the crystal field. Nature Physics, xx(xx), xx-xx. doi:10.1038/s41567-020-0936-3.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-6C0B-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-9821-9
Genre: Journal Article

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Supplementary information (Figs. 1–6, Tables 1–3 and refs. 1–25 [pdf]), Source data (Data for measured Faraday rotation and circular dichroism plotted in Fig. 4, Data for measured temperature, field and frequency dependences plotted in Fig. 5, Data for induced magnetization from experiment and theory plotted in Fig. 6 [dat])
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https://arxiv.org/abs/2001.00540 (Preprint)
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https://dx.doi.org/10.1038/s41567-020-0936-3 (Publisher version)
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https://www.nature.com/articles/s41567-020-0937-2 (Supplementary material)
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News & views article "Shaken not strained" by Dominik M. Juraschek & Prineha Narang

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 Creators:
Disa, A.1, 2, Author              
Fechner, M.1, Author              
Nova, T. F.1, Author              
Liu, B.1, Author              
Foerst, M.1, Author              
Prabhakaran, D.3, Author
Radaelli, P. G.3, Author
Cavalleri, A.1, 2, 3, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2The Hamburg Centre for Ultrafast Imaging, ou_persistent22              
3Clarendon Laboratory, Department of Physics, Oxford University, ou_persistent22              

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 Abstract: Strain engineering is widely used to manipulate the electronic and magnetic properties of complex materials. For example, the piezomagnetic effect provides an attractive route to control magnetism with strain. In this effect, the staggered spin structure of an antiferromagnet is decompensated by breaking the crystal field symmetry, which induces a ferrimagnetic polarization. Piezomagnetism is especially appealing because, unlike magnetostriction, it couples strain and magnetization at linear order, and allows for bi-directional control suitable for memory and spintronics applications. However, its use in functional devices has so far been hindered by the slow speed and large uniaxial strains required. Here we show that the essential features of piezomagnetism can be reproduced with optical phonons alone, which can be driven by light to large amplitudes without changing the volume and hence beyond the elastic limits of the material. We exploit nonlinear, three-phonon mixing to induce the desired crystal field distortions in the antiferromagnet CoF2. Through this effect, we generate a ferrimagnetic moment of 0.2 μB per unit cell, nearly three orders of magnitude larger than achieved with mechanical strain.

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Language(s): eng - English
 Dates: 2020-01-072020-05-112020-06-222020
 Publication Status: Published in print
 Pages: -
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 Rev. Method: Peer
 Identifiers: arXiv: 2001.00540
DOI: 10.1038/s41567-020-0936-3
 Degree: -

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Grant ID : 319286
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: xx (xx) Sequence Number: - Start / End Page: xx - xx Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850