Electronic and magnetic properties of the multiferroic TbMn 2 O 5
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Electronic and magnetic properties of the multiferroic TbMn2O5 A. Endichi1,2 · H. Bouhani1,2 · H. Zaari1 · M. Balli3,4 · O. Mounkachi1 · A. El Kenz1 · A. Benyoussef5,6 · S. Mangin2 Received: 28 February 2020 / Accepted: 24 April 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Recently, a reversible and a giant rotating magnetocaloric effect has been pointed out in the multiferroic TbMn2O5 single crystal, opening the way for new designs of low-temperature magnetic cooling. In this paper, we report a preliminary theoretical work with the aim of enlarging our understanding on the electronic, magnetic and accordingly magnetocaloric features of the TbMn2O5 compound. Particularly, the T bMn2O5 magnetic anisotropy is analyzed in terms of X-ray magnetic circular dichroism (XMCD) and X-ray absorption spectroscopy (XAS) spectra. Keywords Multiferroic materials · Magnetoelectric effect · Magnetic anisotropy · XAS · XMCD · DFT
1 Introduction The discovery of new multiferroic compounds exhibiting a strong magnetoelectric coupling has aroused great interest since the beginning of the century, justified both by the fundamental issues involved and the prospects for technological applications [1]. The interest of these compounds lies in the coupling between orders, magnetic and electrical, with the possibility, from a static point of view, to manipulate the magnetization by applying an electric field [2]. The more recent discovery of magnetoelectric excitations has opened up a new field investigation [3]. In multiferroics, these hybrid excitations called electromagnons can be understood as magnons excited by the electrical component of a * A. Endichi [email protected] 1
LaMCScI, Faculty of Science, Mohammed V University, B.P. 1014, Rabat, Morocco
2
Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine, BP 70239, 54506 Nancy, France
3
LERMA, ECINE, International University of Rabat, Parc Technopolis, Rocade de Rabat-Salé, 11100 Rabat, Morocco
4
Département de Physique and Institut Quantique, Université de Sherbrooke, Québec J1K 2R1, Canada
5
Materials and Nanomaterials Centre, Moroccan Foundation for Advanced Science, Innovation and Reserarch, MAScIR, Rabat, Morocco
6
Hassan II Academy of Science and Technology, Rabat, Morocco
wave electromagnetic and are the signature in the dynamic regime of magnetoelectric coupling [4, 5]. Understanding the mechanisms behind these new excitations is one of the recent challenges of condensed matter physics, and the possibility of modulating these excitations via a field electric and/or magnetic is also an avenue explored for future applications to be defined in the field of information transport, magnetic refrigeration and spintronic devices for example. These materials in which the magnetism and the ferroelectricity are coupled have been widely studied [6–8]. Studies on RMn2O5 oxides have shown an important magnetocaloric effect (MEE) that is associated with a unique commensurate–incommensurate magnetic transition [1–9]. In th
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