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Manipulating magnetism and orbitals by electric fields

English title Manipulating magnetism and orbitals by electric fields
Applicant Staub Urs
Number 137655
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 01.11.2011 - 30.06.2012
Approved amount 37'295.00
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Keywords (1)

multiferroics

Lay Summary (English)

Lead
Lay summary
Manipulating magnetism and orbitals by electric fields

 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 magneto-electric 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 of the materials.

Important unresolved questions are; Is there an order parameter representing directly the magneto-electric 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
Orbital correlations and dimensional crossover in epitaxial Pr0.5Ca0.5MnO3/La0.5Sr0.5MnO3 superlattices
Wadati H., Okamoto J., Garganourakis M., Scagnoli V., Staub U., Sakai E., Kumigashira H., Sugiyama T., Ikenaga E., Nakamura M., Kawasaki M., Tokura Y. (2014), Orbital correlations and dimensional crossover in epitaxial Pr0.5Ca0.5MnO3/La0.5Sr0.5MnO3 superlattices, in NEW JOURNAL OF PHYSICS, 16, 073044.
Dzyaloshinskii-Moriya driven helical-butterfly structure in Ba3NbFe3Si2O14
Scagnoli V., Huang S. W., Garganourakis M., de Souza R. A., Staub U., Simonet V., Lejay P., Ballou R. (2013), Dzyaloshinskii-Moriya driven helical-butterfly structure in Ba3NbFe3Si2O14, in PHYSICAL REVIEW B, 88(10), 104417.
Melting of chiral order in terbium manganate (TbMnO3) observed with resonant x-ray Bragg diffraction
Lovesey S. W., Scagnoli V., Garganourakis M., Koohpayeh S. M., Detlefs C., Staub U. (2013), Melting of chiral order in terbium manganate (TbMnO3) observed with resonant x-ray Bragg diffraction, in JOURNAL OF PHYSICS-CONDENSED MATTER, 25(36), 362202.
Optical and x-ray time resolved study of the structural transition in mixed valence manganites
Caviezel A., Staub U., Johnson S. L., Mariager S. O., Ingold G., Moehr-Vorobeva E., Garganourakis M., Huang S. W., Milne C. J., Jia Q. X., Cheong S. -W., Beaud P. (2013), Optical and x-ray time resolved study of the structural transition in mixed valence manganites, in XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA, 41, 4103002.
Femtosecond dynamics of the structural transition in mixed valence manganites
Caviezel A., Staub U., Johnson S. L., Mariager S. O., Moehr-Vorobeva E., Ingold G., Milne C. J., Garganourakis M., Scagnoli V., Huang S. W., Jia Q. X., Cheong S. -W., Beaud P. (2012), Femtosecond dynamics of the structural transition in mixed valence manganites, in PHYSICAL REVIEW B, 86(17), 174105.
Ferromagnetic-type order of atomic multipoles in the polar ferrimagnetic GaFeO3
Staub U, Piamonteze C, Garganourakis M, Collins SP, Koohpayeh SM, Fort D, Lovesey SW (2012), Ferromagnetic-type order of atomic multipoles in the polar ferrimagnetic GaFeO3, in PHYSICAL REVIEW B, 85(14), 144421 -144421.
Imprinting Magnetic Information in Manganites with X Rays
Garganourakis M., Scagnoli V., Huang S. W., Staub U., Wadati H., Nakamura M., Guzenko V. A., Kawasaki M., Tokura Y. (2012), Imprinting Magnetic Information in Manganites with X Rays, in PHYSICAL REVIEW LETTERS, 109(15), 157203.
Magnetic and electronic orderings in orthorhombic RMnO3 (R = Tm, Lu) studied by resonant soft x-ray powder diffraction
Garganourakis M., Bodenthin Y., de Souza R. A., Scagnoli V., Doenni A., Tachibana M., Kitazawa H., Takayama-Muromachi E., Staub U. (2012), Magnetic and electronic orderings in orthorhombic RMnO3 (R = Tm, Lu) studied by resonant soft x-ray powder diffraction, in PHYSICAL REVIEW B, 86(5), 054425.
Origin of the Large Polarization in Multiferroic YMnO3 Thin Films Revealed by Soft- and Hard-X-Ray Diffraction
Wadati H, Okamoto J, Garganourakis M, Scagnoli V, Staub U, Yamasaki Y, Nakao H, Murakami Y, Mochizuki M, Nakamura M, Kawasaki M, Tokura Y (2012), Origin of the Large Polarization in Multiferroic YMnO3 Thin Films Revealed by Soft- and Hard-X-Ray Diffraction, in PHYSICAL REVIEW LETTERS, 108(4), 047203 -047203.
Magnetic structure and electric field effects in multiferroic YMn2O5
de Souza RA, Staub U, Scagnoli V, Garganourakis M, Bodenthin Y, Huang SW, Garcia-Fernandez M, Ji S, Lee SH, Park S, Cheong SW (2011), Magnetic structure and electric field effects in multiferroic YMn2O5, in PHYSICAL REVIEW B, 84(10), 104416 -104416.
Observation of Orbital Currents in CuO
Scagnoli V, Staub U, Bodenthin Y, de Souza RA, Garcia-Fernandez M, Garganourakis M, Boothroyd AT, Prabhakaran D, Lovesey SW (2011), Observation of Orbital Currents in CuO, in SCIENCE, 332(6030), 696-698.
Origin of the anomalous low-temperature phase transition in BaVS3
de Souza RA, Staub U, Scagnoli V, Garganourakis M, Bodenthin Y, Berger H (2011), Origin of the anomalous low-temperature phase transition in BaVS3, in PHYSICAL REVIEW B, 84(1), 014409 -014409.

Associated projects

Number Title Start Funding scheme
119609 Manipulating magnetism and orbitals by electric fields 01.11.2008 Project funding (Div. I-III)
119609 Manipulating magnetism and orbitals by electric fields 01.11.2008 Project funding (Div. I-III)
139082 Sensitive magnetic susceptibility measurements of materials with novel magnetic correlations and ground states 01.07.2012 R'EQUIP

Abstract

This is an continuation of the Project entitled “Manipulating magnetism and orbitals by electric fields” (No. 200021-119609), which will end 31.10.2011. As that project is in a crucial phase for the PhD thesis of M. Garganourakis, we herewith ask for an extension of 8-10 months, to complete the project. The coexistence of magnetism and ferroelectricity in solid materials is unusual, and still more unusual is the coupling between these phenomena. Materials with such couplings are often called multiferroics, and the coupling is based on the magneto-electric effect. The interest in these materials lies in the fact that a manipulation of electric (magnetic) properties by magnetic (electric) fields would be of great use in spintronic devices. In this study, we concentrated on undoped and doped RMnO3 systems. In particular, it concentrates on the possible occurrence of ferroelectricity in the doped materials, where ferroelectricity is related to the orbital order. We propose to complete the study how the magnetic and orbital properties are influenced by the application of in-situ electric/electromagnetic fields in doped manganites. Our soft x-ray resonant diffraction experiments demonstrate significant changes in the magnetic structure with in-situ applied fields. To get a microscopic understanding of these effects, a few more of these experiments are required. This proposal describes these investigations and the corresponding data analysis.
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