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Dynamics of domain walls and magnetic topological solitons

English title Dynamics of domain walls and magnetic topological solitons
Applicant Kläui Mathias
Number 129720
Funding scheme Project funding
Research institution Institut für Physik Universität Mainz
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.06.2010 - 31.05.2013
Approved amount 502'354.05
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Keywords (9)

Nanomagnetism; Spin Torque; Domain Walls; Magnetic Solitons; Vortices; Magnetic Imaging; Magnetotransport; Spin-polarized currents; Spin Transfer Torque

Lay Summary (English)

Lead
Lay summary
Modern information and communication technology relies on fast processing of data but also on storing large quantities of information that need to be accessed quickly. So fast, high capacity, low form factor and low power non-volatile memories are a crucial enabler of today's IT. They are already an important part of all electronic systems, representing a growing market segment, and should increase their importance in the future en route towards the "Storage everywhere" society. Magnetic storage has been prevalent in the form of hard disk drives with massive capacity but slow access times. Rather than using conventional field-induced switching of such memories, recently alternative approaches based for instance on switching by magnetic domain wall motion have been put forward (race track memory device).The fundamental physics underlying fast wall displacement in a magnetic wire when spin-polarized currents are injected is only starting to be revealed. This proposal tackles the major open questions of the fundamental magnetotransport in confined spin structures with varying magnetization gradients. We suggest a number of complementary robust methods, which allow for the first time the unambiguous measurement the spin torque terms that arise due to the interaction between spin-polarized charge carriers and the magnetization and lead to spin dynamics. We extend the work on domain walls to other magnetic soliton spin structures to probe the universality of the dynamics that is governed by the topological winding numbers that describe the spin structures.This might then lead to novel spin configurations that could be used in future storage or logic devices, which are non-volatile and thus energy-saving.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Magnetic domain structure of La0.7Sr0.3MnO 3 thin-films probed at variable temperature with scanning electron microscopy with polarization analysis
Reeve RM, Mix C, König M, Foerster M, Jakob G, Kläui M (2013), Magnetic domain structure of La0.7Sr0.3MnO 3 thin-films probed at variable temperature with scanning electron microscopy with polarization analysis, in Applied Physics Letters, 102(12), 1.
Magnetic states in low-pinning high-anisotropy material nanostructures suitable for dynamic imaging
Büttner F, Moutafis C, Bisig A, Wohlhüter P, Günther CM, Mohanty J, Geilhufe J, Schneider M, Korff Schmising CV, Schaffert S, Pfau B, Hantschmann M, Riemeier M, Emmel M, Finizio S, Jakob G, Weigand M, Rhensius J, Franken JH, Lavrijsen R, Swagten HJM, Stoll H, Eisebitt S, Kläui M (2013), Magnetic states in low-pinning high-anisotropy material nanostructures suitable for dynamic imaging, in Physical Review B - Condensed Matter and Materials Physics, 87(13), 134422.
The effect of magnetic anisotropy on the spin configurations of patterned La0.7Sr0.3MnO3 elements
Wohlhüter P, Rhensius J, Vaz CAF, Heidler J, Körner HS, Bisig A, Foerster M, Méchin L, Gaucher F, Locatelli A, Niño MA, El Moussaoui S, Nolting F, Goering E, Heyderman LJ, Kläui M (2013), The effect of magnetic anisotropy on the spin configurations of patterned La0.7Sr0.3MnO3 elements, in Journal of Physics Condensed Matter, 25(17), 1.
Interaction between propagating spin waves and domain walls on a ferromagnetic nanowire
Kim J-S, Stärk M, Kläui M, Yoon J, You C-Y, Lopez-Diaz L, Martinez E (2012), Interaction between propagating spin waves and domain walls on a ferromagnetic nanowire, in Physical Review B - Condensed Matter and Materials Physics, 85(17), 1.
Ultrafast optical demagnetization manipulates nanoscale spin structure in domain walls
Pfau B, Schaffert S, Müller L, Gutt C, Al-Shemmary A, Büttner F, Delaunay R, Düsterer S, Flewett S, Frömter R, Geilhufe J, Guehrs E, Günther CM, Hawaldar R, Hille M, Jaouen N, Kobs A, Li K, Mohanty J, Redlin H, Schlotter WF, Stickler D, Treusch R, Vodungbo B, Kläui M (2012), Ultrafast optical demagnetization manipulates nanoscale spin structure in domain walls, in Nature Communications, 3, 1.
Holographically aided iterative phase retrieval
Flewett S., Guenther C. M., Schmising C. von Korff, Pfau B., Mohanty J., Buettner F., Riemeier M., Hantschmann M., Klaeui M., Eisebitt S. (2012), Holographically aided iterative phase retrieval, in OPTICS EXPRESS, 20(28), 29210-29216.
Determination of the spin torque non-adiabaticity in perpendicularly magnetized nanowires.
Heinen J, Hinzke D, Boulle O, Malinowski G, Swagten H J M, Koopmans B, Ulysse C, Faini G, Ocker B, Wrona J, Kläui M (2012), Determination of the spin torque non-adiabaticity in perpendicularly magnetized nanowires., in Journal of physics. Condensed matter : an Institute of Physics journal, 24(2), 024220-024220.
Analytical description for current-induced vortex core displacement
Heyne L, Kläui M (2011), Analytical description for current-induced vortex core displacement, in Journal of Applied Physics, 109(7), 1.
Control of spin configuration in half-metallic La 0.7Sr 0.3MnO 3 nano-structures
Rhensius J, Vaz CAF, Bisig A, Schweitzer S, Heidler J, Körner HS, Locatelli A, Niño MA, Weigand M, Méchin L, Gaucher F, Goering E, Heyderman LJ, Kläui M (2011), Control of spin configuration in half-metallic La 0.7Sr 0.3MnO 3 nano-structures, in Applied Physics Letters, 99(6), 1.
Current-induced domain wall motion in nanoscale ferromagnetic elements
Boulle O, Malinowski G, Kläui M (2011), Current-induced domain wall motion in nanoscale ferromagnetic elements, in Materials Science and Engineering R: Reports, 72(9), 159-187.
Current-induced domain wall motion in nanoscale ferromagnetic elements
Malinowski G, Boulle O, Kläui M (2011), Current-induced domain wall motion in nanoscale ferromagnetic elements, in Journal of Physics D: Applied Physics, 44(38), 1.
Extraction of the spin torque non-adiabaticity from thermally activated domain wall hopping
Heinen J, Hinzke D, Boulle O, Malinowski G, Swagten HJM, Koopmans B, Ulysse C, Faini G, Kläui M (2011), Extraction of the spin torque non-adiabaticity from thermally activated domain wall hopping, in Applied Physics Letters, 99(24), 1.
Formation of magnetic domains and domain walls in epitaxial Fe 3O4(100) elements (invited)
Fonin M, Hartung C, Rüdiger U, Backes D, Heyderman L, Nolting F, Rodírguez AF, Kläui M (2011), Formation of magnetic domains and domain walls in epitaxial Fe 3O4(100) elements (invited), in Journal of Applied Physics, 109(7), 1.
Spin configurations in Co2FeAl0.4Si0.6 Heusler alloy thin film elements
Vaz CAF, Rhensius J, Heidler J, Wohlhüter P, Bisig A, Körner HS, Mentes TO, Locatelli A, Guyader LL, Nolting F, Graf T, Felser C, Heyderman LJ, Kläui M (2011), Spin configurations in Co2FeAl0.4Si0.6 Heusler alloy thin film elements, in Applied Physics Letters, 99(18), 1.

Collaboration

Group / person Country
Types of collaboration
Universität Konstanz Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
CEN, Technical University Denmark Denmark (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Paul Scherrer Institut Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Metallic Multilayers Symposium 2013 23.05.2013 Kyoto, Japan
Hysteresis and Micromagnetic Modelling Conference 2013 13.05.2013 Taormina, Italien
Ultra-fast Domain Wall Dynamics 26.04.2013 IFW Dresden, Deutschland
Magnetic GreenIT devices - why and how 25.04.2013 Universität Dresden, Deutschland
Ultra-fast Domain Wall Dynamics 20.03.2013 Freie Universität Berlin, Deutschland
Sustainable Energy Meeting 2013, Akademie der Naturforscher Leopoldina 19.03.2013 Berlin, Germany
Heraeus Workshop Functional Membranes 04.03.2013 Bad Honnef, Germany
Low Power current-induced switching – 16.12.2012 Peter Grünberg Institut, Forschungszentrum Jülich, Deutschland
Materials Science Summit 2012, Institute for Materials Research, Tohoku University 27.11.2012 Sendai, Japan
Ultra-fast Domain Wall Dynamics 26.11.2012 Japan Atomic Energy Agency, Tokai, Japan
Ultra-fast Domain Wall Dynamics 22.11.2012 Information Storage Materials Laboratory, Toyota Technological Institute, Nagoya, Japan
Ultra-fast Domain Wall Dynamics 03.09.2012 Department of Physics, University of Leeds, UK
International Materials Research Congress 13.08.2012 Cancun, Mexiko
Domain Wall Dynamics 10.08.2012 Department of Physics, Universität Köln, Deutschland
DIAMOND User Meeting 2012 05.08.2012 Harwell, UK
Spin Dynamics in Nanomagnets 15.07.2012 Seoul, Korea
International Conference on Magnetism 10.07.2012 Busan, Korea
Spincaloritronics 4 04.06.2012 Sendai, Japan
International Symposium on the Dynamics of Domain Walls 30.05.2012 Hamburg, Germany
Domain Wall Dynamics 13.03.2012 Physikalisch Technische Bundesanstalt, Braunschweig, Deutschland
ASRC Spintronics Workshop 2012 10.01.2012 Tokai, Japan
Heraeus Dreikönigstreffen 2012 Spincaloritronics 05.01.2012 Bad Honnef, Germany
NewSPIN 2 Conference 14.12.2011 College Station, USA
Low Power current-induced switching – a path to magnetic GreenIT data storage 09.11.2011 Department of Physics, Rice University, USA
Center for Materials for Information Technology Review Meeting 2011 27.10.2011 University of Alabama, Tuscaloosa, USA
SPIE 2012 12.08.2010 San Diego, USA


Self-organised

Title Date Place
Spintronics beyond the conventional approach. Nanoscale magnetic systems for low power electronics 17.11.2011 Department of Mathematics, Physics and Computer Science, Johannes Gutenberg-University Mainz, Deutsc

Knowledge transfer events

Active participation

Title Type of contribution Date Place Persons involved
Nanomagnetism beyond the conventional approach 21.10.2011 Sensitec, Mainz, Deutschland


Awards

Title Year
Best Poster Award, 2013 Joint MMM/Intermag Conference Chicago 2013
Best Poster Prize for Amelie Axt, 526th Heraeus Seminar, Bad Honnef, Germany 2013
Best Poster Award, 2012 Intermag Conference, Vancouver 2012

Associated projects

Number Title Start Funding scheme
133815 Setup for studies of quantum phenomena in condensed matter systems at ultra-low temperatures in magnetic vector fields 01.04.2012 R'EQUIP

Abstract

In this project the dynamics of magnetic topological soliton spin structures, such as domain walls will be investigated and by inducing the dynamics using injected spin-polarized currents, the fundamental interplay between spin-polarized charge carriers and the magnetization will be determined. Static and dynamic imaging of simple solitons such as domain walls and vortices will be extended to more complex bubble solitons and the dynamics will be correlated with the topological winding number to probe the universal behaviour that is predicted to be governed just by the topology of the spin structure.The dynamics can be induced by injecting currents that lead to novel spin transfer torque effects, as the spin-polarized current interacts with the magnetic spin structure. To understand this interaction and validate the present contradicting theories, a range of robust and complementary experiments supplemented by theoretical simulations is proposed that allows one to unambiguously and quantitatively determine the torque terms. The experiments will be extended from the well-known 3d metals to exciting other materials, where larger effects are expected, such as rare earth compounds, highly anisotropic multilayers and in particular highly spin-polarized materials classes. Correlating the observed effects with the materials properties will yield the details of the interaction between the spin - polarized charge carriers and the magnetization, which in most materials is far from being understood and the validity and limits of the presently used theoretical models will be tested.The systems will be optimized to judge the potential for applications including storage, sensing and logic as well as for spin torque domain wall oscillators.
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