Nature of antiferromagnetic order in epitaxially strained multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SrMnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>thin films

Maurel, Laura; Marcano, N.; Prokscha, T.; Langenberg, Eric; Blasco, Javier; Guzmán, Roger; Suter, A.; Magén, Cesar; Morellón, L.; Ibarra, M. R.; Pardo, J. A.; Algarabel, P. A.

doi:10.1103/physrevb.92.024419

Cited by 62 publications

(53 citation statements)

References 53 publications

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“…Ferromagnetic (FM) and G-type antiferromagnetic (AFM) phases have been observed in SrCoO 3−δ films subject to low (SrTiO 3 substrate) and large (DyScO 3 substrate) tensile epitaxial strains, respectively 10 . An increase (decrease) of Néel temperature due to compressive (tensile) biaxial strain was predicted in AFM SrTcO 3 films 11 A very strong dependence of T N on biaxial strain (≈ 50 K per 1%) has been predicted 12 and subsequently confirmed experimentally 13 for G-type AFM phase of SrMnO 3 . The ability to drive a magnetic phase transition with a large entropy change, ∆S = 9 J/kgK, by means of biaxial strain was demonstrated in La 0.7 Ca 0.3 MnO 3 film on BaTiO 3 substrate.…”

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confidence: 75%

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

et al. 2017

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Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher statement: © 2017 American Physical Society A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. We model changes of magnetic ordering in Mn-antiperovskite nitrides driven by biaxial lattice strain at zero and at finite temperature. We employ a non-collinear spin-polarised density functional theory to compare the response of the geometrically frustrated exchange interactions to a tetragonal symmetry breaking (the so called piezomagnetic effect) across a range of Mn3AN (A = Rh, Pd, Ag, Co, Ni, Zn, Ga, In, Sn) at zero temperature. Building on the robustness of the effect we focus on Mn3GaN and extend our study to finite temperature using the disordered local moment (DLM) first-principles electronic structure theory to model the interplay between the ordering of Mn magnetic moments and itinerant electron states. We discover a rich temperature-strain magnetic phase diagram with two previously unreported phases stabilised by strains larger than 0.75% and with transition temperatures strongly dependent on strain. We propose an elastocaloric cooling cycle crossing two of the available phase transitions to achieve simultaneously a large isothermal entropy change (due to the first order transition) and a large adiabatic temperature change (due to the second order transition).

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confidence: 75%

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

et al. 2017

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“…19 . Here, the oxygen-pressure dependence on the perovskite phase stabilization is the direct evidence that the formation of oxygen vacancies during thin film growth plays a central role in its stability, since perovskite SMO is only stabilized under low oxygen pressure 28,36,37 . The formation of oxygen vacancies is charge compensated by a reduction of the formal oxidation state of some Mn 4+ to Mn 3+ , resulting in a chemical expansion of the crystal lattice, relieving the strain.…”

Section: Textmentioning

confidence: 98%

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 8 Earlier works in ferroelectric HoMnO 3 epitaxial films pointed out the interplay between strain gradients and the presence of oxygen vacancies and the possibility to modulate the strain gradients, and thus flexoelectricity and polarization, as a function of the oxygen pressure during the film growth 19 . Here, the oxygen-pressure dependence on the perovskite phase stabilization is the direct evidence that the formation of oxygen vacancies during thin film growth plays a central role in its stability, since perovskite SMO is only stabilized under low oxygen pressure 28,36,37 . The formation of oxygen vacancies is charge compensated by a reduction of the formal oxidation state of some Mn 4+ to Mn 3+ , resulting in a chemical expansion of the crystal lattice, relieving the strain.…”

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confidence: 98%

Polar-Graded Multiferroic SrMnO₃ Thin Films

et al. 2016

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Engineering defects and strains in oxides provides a promising route for the quest of thin film materials with coexisting ferroic orders, multiferroics, with efficient magnetoelectric coupling at room temperature. Precise control of the strain gradient would enable custom tailoring of the multiferroic properties, but presently remains challenging. Here we explore the existence of a polar-graded state in epitaxially-strained antiferromagnetic SrMnO 3 thin films, whose polar nature was predicted theoretically, and recently demonstrated experimentally. By means of aberration-corrected scanning transmission electron microscopy we map the polar rotation of the ferroelectric polarization at atomic resolution, both far from and near the domain walls and find flexoelectricity resulting from vertical strain gradients. The origin of this particular strain state is a gradual distribution of oxygen vacancies across the film thickness, according to electron energy loss spectroscopy. Herein we present a chemistry-mediated route to induce polar rotations in oxygen-deficient multiferroic films, resulting in flexoelectric polar rotations and with potentially enhanced piezoelectricity. KEYWORDS: Multiferroics, ferroelectricity, flexoelectricity, aberration-corrected STEM, domain walls. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 4 TEXT Multiferroic materials have attracted great interest recently because of their intriguing fundamental physics and the wide range of potential applications such as transducers and information storage [1][2][3] . Of particular technological impact is the search for materials showing efficient coupling between ferromagnetic and ferroelectric orders that persist at room temperature. Manganese-based perovskite oxides AMnO 3 , A being an alkaline-earth cation, are particularly promising for this purpose; theoretical calculations reveal the onset of a ferroelectric ground state with strong magnetoelectric coupling since the spontaneous polarization is expected to be driven by the off-centering of the magnetic Mn 4+ ion 4,5 . The ferroelectric instability is predicted to increase by expansion of the lattice and, in turn, strain-induced ferroelectricity was experimentally demonstrated in Ba-substituted SrMnO 3 single crystals, in which chemical expansion of the crystal lattice is caused by partially replacing Sr with larger Ba ions 6 .Alternatively, strains can be induced into films through the use of epitaxial growth and can be utilized to modify the ferroelectric film properties by an adequate choice of the substrate 7-9 . In particular, strain-engineering of multiferroism has opened a path for the e...

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“…However, macroscopic magnetic measurements on our present sample with strain up to 3.8% (Supplemental Material Fig. 8 [29]) shows no detectable remnant magnetization down to ∼10 K, indicating that the system retains its antiferromangetic state [34]. In order to investigate the magnetic nature of the highly strained SMO films, x-ray absorption spectroscopy (XAS) and x-ray linear dichroism (XLD) were employed to probe the antiferromagnetic state [35].…”

Section: Strain Tuning Of Antiferromagnetic Ordering and Spin-lattmentioning

confidence: 99%

Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin films

et al. 2018

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Reprinted with permission from the American Physical Society: Guo, J. W., Wang, P. S., Yuan, Y., He, Q., Lu, J. L., Chen, T. Z., Yang, S. Z., Wang, Y. J., Erni, R., Rossell, M. D., Gopalan, V., Xiang, H. J., Tokura, Y. Yu, P. (2018). Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin lms. Physical Review B 97(23): 235135 c 2018 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Nature of antiferromagnetic order in epitaxially strained multiferroicSrMnO3thin films

Cited by 62 publications

References 53 publications

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

Polar-Graded Multiferroic SrMnO₃ Thin Films

Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin films

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Nature of antiferromagnetic order in epitaxially strained multiferroicSrMnO3thin films

Cited by 62 publications

References 53 publications

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

Polar-Graded Multiferroic SrMnO3 Thin Films

Strain-induced ferroelectricity and spin-lattice coupling in SrMnO3 thin films

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Polar-Graded Multiferroic SrMnO₃ Thin Films