Abstract
The prospect of controlling the magnetization (M) of a material solely with an external electric field (E) could enable the development of low-power spintronics. Although there has been some success towards this end, most approaches involve controlling interactions at the interface between two different materials rather than switching of a single bulk phase. Here we report the ability to exert complete control over the generation and reversal of the bulk spontaneous M of the single-component multiferroics RFeO3 (R = Dy0.70Tb0.30, Dy0.75Gd0.25) with an E alone. We achieve this by controlling the anisotropic character of rare-earth magnetism and exploiting the competition between different magnetoelectric phases. We also show that whether M is reversed or retained on the E-induced polarization reversal depends on the E modulation speed. This is ascribed to the different dynamical characteristics of ferroelectric and multiferroic domain walls governed by the reversal dynamics of rare-earth moments and iron spins, respectively.
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Acknowledgements
The authors thank N. Furukawa, S. Miyahara, H. Sakai and D. Okuyama for fruitful discussions. This work was supported in part by Grants-in-Aid for Scientific Research from the MEXT, Japan and Funding Program for World Leading Innovative R&D on Science and Technology (FIRST) on ‘Quantum Science on Strong Correlation’ from JSPS.
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The experiments were performed by Y. Tokunaga. The results were discussed and interpreted by Y. Tokunaga, Y. Taguchi, T-h.A. and Y. Tokura.
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Tokunaga, Y., Taguchi, Y., Arima, Th. et al. Electric-field-induced generation and reversal of ferromagnetic moment in ferrites. Nature Phys 8, 838–844 (2012). https://doi.org/10.1038/nphys2405
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DOI: https://doi.org/10.1038/nphys2405
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