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Magnetic and electric properties of the multiferroic orthorhombic RMnO3 family

Applicant Staub Urs
Number 137657
Funding scheme Project funding (Div. I-III)
Research institution Synchrotron Lichtquelle Schweiz Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Condensed Matter Physics
Start/End 01.08.2012 - 31.07.2015
Approved amount 172'498.00
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Keywords (2)

multiferroics; resonant x-ray diffraction

Lay Summary (English)

Lead
Lay summary
Magnetic and orbital ordering phenomena in multiferroic perovskite manganites

The fundamental understanding of the microscopic origin of interaction between magnetism and ferroelectricity is of general importance. This effect is often called multiferroicity. In particular, it occurs in transition metal oxides, as a ferroelectric polarization naturally requires a insulating character of the materials. We would like to address the question: what happens on the atomic level, how are magnetic moments coupled to the ferroelectric polarization, can we use electric fields to manipulate magnetic order,  can we use magnetic fields to manipulate ferroelectric order? 

The fundamental understanding of the microscopic origin of the magnetoelectric effect has recently attracted renewed interest,  in particular,  since the discovery ofgigantic couplings of ferroelectricity with magnetism in manganites. These materials are oxides which has strange electric and magnetic properties and may are materials for technical applications for the next generation. Here we would like to understand basic questions of what happens on the atomic level to obtain a better understanding of the properties in perovskite manganites. In particular, we like to investigate these systems in the existence of thin epitaxial films, as some of the simple perovskite do not exist as orthorhombic perovskite structure in its bulk form.

Important unresolved questions are:

What is the magnetic structure in the film?

Can we switch the magnetic domains with electric fields?

Is there an order parameter representing directly the magnetoelectric coupling?

Can we move spins by electric fields and if so how do they move?

With a new technique, soft x-ray resonant scattering (presently available at the Swiss Light Source), we can directly determine the orbital orientation and magnetic ordering of these materials. These measurements have a great potential to resolve the microscopic origin of the magnetoelectric coupling and allow us to directly see if and how electric fields influence magnetism on the atomic level. Such understanding is important for possible future applications of these materials.

Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Multiferroic properties of uniaxially compressed orthorhombic HoMnO3 thin films
K. Shimamoto, Y. W. Windsor, Y. Hu, M. Ramakrishnan, A. Alberca, E. M. Bothschafter, L. Rettig, Th. Lippert, U. Staub, C. W. Schneider (2016), Multiferroic properties of uniaxially compressed orthorhombic HoMnO3 thin films, in APPLIED PHYSICS LETTERS, 112904.
Element-specific magnetization redistribution at YBa2Cu3O7/La2/3Ca1/3MnO3 interfaces
A. Alberca, M. A. Uribe-Laverde, Y. W. Windsor, M. Ramakrishnan, L. Rettig, I. Marozau, J-M. Tonnerre, J. Stahn, U. Staub, C. Bernhard (2015), Element-specific magnetization redistribution at YBa2Cu3O7/La2/3Ca1/3MnO3 interfaces, in Phys. Rev. B, 92, 174415.
Interplay between magnetic order at Mn and Tm sites alongside the structural distortion in multiferroic films of o-TmMnO3
Windsor Y. W., Ramakrishnan M., Rettig L., Alberca A., Bothschafter E. M., Staub U., Shimamoto K., Hu Y., Lippert T., Schneider C. W. (2015), Interplay between magnetic order at Mn and Tm sites alongside the structural distortion in multiferroic films of o-TmMnO3, in PHYSICAL REVIEW B, 91(23), 1-4.
Magnetic order dynamics in optically excited multiferroic TbMnO3
J. A. Johnson, T. Kubacka, M. C. Hoffmann, C. Vicario, S. de Jong, P. Beaud, S. Grubel, S.-W. Huang, L. Huber, Y. W. Windsor, E. M. Bothschafter, L. Rettig, M. Ramakrishnan, A. Alberca, L. Patthey, Y.-D. Chuang, J. J. Turner, G. L. Dakovski, W.-S. Lee, M. P. Minitti, W. Schlotter, R. G. Moore, C. P. Hauri, S. M. Koohpayeh, V. Scagnoli et al. (2015), Magnetic order dynamics in optically excited multiferroic TbMnO3, in Phys. Rev. B, 92, 184429.
Multiferroic Properties of o-LuMnO3 Controlled by b-Axis Strain
Windsor Y. W., Huang S. W., Hu Y., Rettig L., Alberca A., Shimamoto K., Scagnoli V., Lippert T., Schneider C. W., Staub U. (2014), Multiferroic Properties of o-LuMnO3 Controlled by b-Axis Strain, in PHYSICAL REVIEW LETTERS, 113(16), 1-9.

Collaboration

Group / person Country
Types of collaboration
C. Schneider, PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
H. Wadati, Univ. of Tokyo Japan (Asia)
- in-depth/constructive exchanges on approaches, methods or results
C. Niedermayer, PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Multiferroic & Magnetoelectric Materials Gordon Research Conference Poster “Multiferroic Squeezing” - Lattice control of magnetic modulation in o-RMnO3 07.08.2016 Lewiston, United States of America Windsor Yoav William;
International Conference on Magnetism ICM2015 Talk given at a conference Multiferroic perovskite RMnO3 crystalline films studied by resonant soft and hard X-ray diffraction 05.07.2015 Barcelona, Spain Windsor Yoav William;
International Conference on Strongly Correlated Electron Systems Poster Multiferroic properties of o-LuMnO 3 controlled by b-axis strain 07.07.2014 grenoble, France Windsor Yoav William;
SPS Meeting Poster Multiferroic properties of o-LuMnO 3 controlled by b-axis strain 30.06.2014 Fribourg, Switzerland Windsor Yoav William;
Sixth European School on Multiferroics (ESMF6), Poster Multiferroic properties of o-LuMnO 3 21.07.2013 Wittenberg DE, Germany Windsor Yoav William;
5th MaNEP winter school Poster Multiferroic properties of o-LuMnO3 13.01.2013 Saas-Fee, Switzerland Windsor Yoav William;


Associated projects

Number Title Start Funding scheme
119609 Manipulating magnetism and orbitals by electric fields 01.11.2008 Project funding (Div. I-III)
144115 Dynamics of electromagnetic control in induced multiferroics 01.01.2013 Project funding (Div. I-III)
139082 Sensitive magnetic susceptibility measurements of materials with novel magnetic correlations and ground states 01.07.2012 R'EQUIP
159220 Magnetic and electric properties of the multiferroic orthorhombic RMnO3 family 01.09.2015 Project funding (Div. I-III)
159220 Magnetic and electric properties of the multiferroic orthorhombic RMnO3 family 01.09.2015 Project funding (Div. I-III)

Abstract

Changing materials properties by electric, magnetic and electromagnetic fields lies on the heart of today’s information technologies. In this proposal we like to study the effect of electric fields on the electronic and magnetic properties of magnetic oxides. We will concentrate on magnetic oxides which are magnetoelectric or multiferroic, with the focus on perovskite manganites. For this purpose, we will apply electric fields and study the magnetic and electronic properties on the atomic level of bulk materials and compare it with epitaxial grown films. We will mainly use the reciprocal space technique, resonant x-ray diffraction (RXD), predominantly in the soft x-ray regime. This is a challenging and rapidly developing experimental technique which provides direct access to the magnetic and electronic states of the valence shells of 3d and 4f materials. Our preliminary RXD experiments demonstrate significant changes in the magnetic structure with in-situ applied electric fields of the RMn2O5 multiferroics. In this proposal, investigations are focused on perovskite multiferroic RMnO3 (R=rare earth or Y). We like to extend our current understanding of the orthorhombic materials to the small (heavy) R ions, which cannot be obtained as sufficient sized single crystals. These materials have larger polarization and have recently been shown to be grown as epitaxial films. This allows also to study the strain influence on the magnetic and ferroelectric properties. The main question is to understand the basic interactions of the electric fields with the electronic and the different magnetic properties (structures) of these complex oxides. Such an understanding will be important for future spintronic devices based on the magnetoelectric interaction of multiferroics, in particular in thin films which would be required for future applications.
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