Oxide electronics

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Magneto-orbital helices and multiferroicity

(2012)

Authors:

NJ Perks, RD Johnson, C Martin, LC Chapon, PG Radaelli
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Erratum: Electric field control of chiral magnetic domains in the high-temperature multiferroic CuO [Phys. Rev. B 85, 134428 (2012)]

Physical Review B American Physical Society (APS) 86:1 (2012) 019905

Authors:

P Babkevich, A Poole, RD Johnson, B Roessli, D Prabhakaran, AT Boothroyd
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Magnetic structure of DyMn 2O 5 determined by resonant x-ray scattering

Physical Review B - Condensed Matter and Materials Physics 85:22 (2012)

Authors:

GE Johnstone, RA Ewings, RD Johnson, C Mazzoli, HC Walker, AT Boothroyd

Abstract:

Resonant magnetic x-ray scattering has been used to investigate the magnetic structure of the magnetoelectric multiferroic DyMn 2O 5. We have studied the magnetic structure in the ferroelectric phase of this material, which displays the strongest ferroelectric polarization and magnetodielectric effect of the RMn 2O 5 (where R is a rare-earth ion, Y or Bi) family. The magnetic structure observed is similar to that of the other members of the series, but differs in the direction of the ordered moments. In DyMn 2O 5, both the Dy and Mn moments lie close to the b axis, whereas in other RMn 2O 5 they lie close to the a axis. © 2012 American Physical Society.
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Advances in the understanding of multiferroics through soft X-ray diffraction

European Physical Journal: Special Topics 208:1 (2012) 99-106

Authors:

TAW Beale, SB Wilkins, RD Johnson, D Prabhakaran, AT Boothroyd, P Steadman, SS Dhesi, PD Hatton

Abstract:

The magneto-electric multiferroic TbMn 2O 5 has a complex magnetic structure in three different magnetically ordered phases. We have determined the nature of the induced magnetic order on the oxygen sites in the commensurate magnetic phase through full linear X-ray polarisation analysis at the oxygen K edge. This has been achieved rotating the linear polarisation of the incident beam at the source, and using multilayers to analyse the polarisation state of the scattered X-ray beam. We have confirmed that the anisotropy of the magnetic scattering at the oxygen edge is consistent with the anisotropy of the manganese magnetic structure. © 2012 EDP Sciences, Springer-Verlag.
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REXS contribution to electronic ordering investigation in solids

European Physical Journal: Special Topics 208:1 (2012) 89-98

Authors:

TAW Beale, G Beutier, SR Bland, A Bombardi, L Bouchenoire, O Bunǎu, S Di Matteo, J Fernández-Rodríguez, JE Hamann-Borrero, J Herrero-Martín, VLR Jacques, RD Johnson, A Juhin, T Matsumura, C Mazzoli, AM Mulders, H Nakao, J Okamoto, S Partzsch, AJ Princep, V Scagnoli, J Strempfer, C Vecchini, Y Wakabayashi, HC Walker, D Wermeille, Y Yamasaki

Abstract:

Resonant Elastic X-Ray Scattering (REXS) has played a fundamental role in understanding electronic properties and in revealing hidden order, local symmetries and exotic states realized in correlated solids. This article reports on some of the relevant scientific contributions and technical advances over the last 20 years, by providing a list of related publications produced by various groups all around the world. The given perspective is that of a group of young scientists involved at various times in the investigation of the beauty of electronic ordering by the REXS technique. © 2012 EDP Sciences, Springer-Verlag.
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