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Magnetoelectric multiferroics hold great promise for electrical control of magnetism or magnetic control of ferroelectricity. However, single phase ferroelectric materials with a sizeable ferromagneti

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Saumya Mukherjee, Andreas Dönni, Taro Nakajima, Setsuo Mitsuda, Makoto Tachibana, Hideaki Kitazawa, Vladimir Pomjakushin, Lukas Keller, Christof Niedermayer, Andrea Scaramucci, Michel Kenzelmann,
Project Structural and magneto-electric properties of strained REMnO3 films
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Original article (peer-reviewed)

Journal Phzsical Review B
Volume (Issue) 95(10)
Page(s) 104412-1 - 104412-9
Title of proceedings Phzsical Review B
DOI 10.1103/physrevb.95.104412

Abstract

Multiferroic orthorhombic o-LuMnO3 exhibits large ferroelectric polarization induced by an E-type magnetic order. Recently, the E-type magnetic phase in LuMnO3 was proposed to feature magnetic moments tilted away from the collinear ordering. We employed neutron diffraction to determine the symmetry of the magnetic order in o-LuMnO3. We observed that below TN = 39 K, the Mn3+ spins order into an incommensurate amplitudemodulated phase that obeys the Pbnm crystal symmetry and is paraelectric. The incommensurate phase locks into a commensurate phase at TC = 35.5 K described by a fully antiferromagnetic and noncollinear E-type order. This noncollinear E-type ordering breaks the spatial inversion symmetry and induces a spontaneous polarization at TC. At T = 2 K, an appreciably large electric polarization was observed similar to that of other orthorhombic manganites featuring E-type magnetic order.We also present a Pbnm symmetry-allowed Dzyaloshinskii-Moriya interaction that explains the noncollinear E-type order in the commensurate phase. These results are in qualitative agreement with the type of distortions from collinear E-type antiferromagnetic order found using Monte Carlo simulation for rare-earth manganites [M. Mochizuki et al., Phys. Rev. B 84, 144409 (2011)].
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