| 14 Jul 2017 |
"Science": Using Neutrons for Switchable Antiferromagnets
Jülich, 14 July 2017 – In the journal Science, a Chinese–German team of researchers has presented a novel synthetic antiferromagnetic material which may prove pioneering for progress in nanomedicine and information technology. Up until now, synthetic antiferromagnets have been manufactured primarily from transition metals and alloys. The scientists from the University of Science and Technology of China in Hefei manufactured a different kind of antiferromagnet consisting of several oxide layers only a few nanometres thick, whose properties can be adapted to various applications in a targeted manner. In collaboration with Forschungszentrum Jülich, the researchers used neutron measurements at Heinz Maier-Leibnitz Zentrum (MLZ) to show that the individual layers of the new material can be magnetized and their polarity reversed – meaning that the magnetic states can be switched in a controlled fashion.
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All-oxide-based synthetic antiferromagnets exhibiting layer-resolved magnetization reversal
Binbin Chen, Haoran Xu, Chao Ma, Stefan Mattauch, Da Lan, Feng Jin, Zhuang Guo, Siyuan Wan, Pingfan Chen, Guanyin Gao, Feng Chen, Yixi Su, Wenbin Wu
Science (published 14 July 2017); DOI: 10.1126/science.aak9717
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| 10 Apr 2017 |
A New View on the Origin of Magnetism
Jülich, 10 April 2017 – How does a ferromagnet behave during the transition to a paramagnetic state? The answer to this question is decisive for understanding the quantum-mechanical origins of magnetism – and may even point to a way to achieve faster data storage. With the aid of a novel measuring technique, a team of German and American researchers has succeeded in finding a new answer to this question.
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Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt, by Steffen Eich, Moritz Plötzing, Markus Rollinger, Sebastian Emmerich, Roman Adam, Cong Chen, Henry Cornelius Kapteyn, Margaret M. Murnane, Lukasz Plucinski, Daniel Steil, Benjamin Stadtmüller, Mirko Cinchetti, Martin Aeschlimann, Claus M. Schneider, Stefan Mathias, Science Advances, DOI: 10.1126/sciadv.1602094
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| 20 Dec 2016 |
Characterization of Magnetic Nanovortices Simplified
Jülich, 20 December 2016 - Magnetic nanovortices, so-called “skyrmions”, count among the most promising candidates for the future of information technology. Processors and storage media making use of these tiny structures could one day lead to the further miniaturization of IT devices and improve their energy efficiency significantly. Materials possessing suitable vortices can be identified in particular by their topological charge, an essential characteristic of skyrmions. To determine this property experimentally has up to now been a very laborious process. Physicists from Jülich have now put forward a simpler method which could speed up the screening of suitable materials, using X-rays.
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Chirality-driven orbital magnetic moments as a new probe for topological magnetic structures;
Manuel dos Santos Dias et al; Nat. Commun. 7, 13613, DOI: 10.1038/ncomms13613
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| 13 Jun 2019 |
Concert of magnetic moments
Jülich, 13 June 2019 – An international collaboration between researchers from Germany, the Netherlands, and South Korea has uncovered a new way how the electron spins in layered materials can interact. In their publication in the journal Nature Materials, the scientists report a hitherto unknown chiral coupling that is active over relatively long distances.
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D.-S. Han et al.
Long-range chiral exchange interaction in synthetic antiferromagnets
Nature Materials (2019), https://doi.org/10.1038/s41563-019-0370-z
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| 22 Jun 2018 |
Conductive or Not – Measuring Nanoswitches for Future Computers with Atomic Precision
Jülich, 22 June 2018 – A team of German and Polish scientists at Forschungszentrum Jülich has for the first time imaged the conductivity of metal oxide surfaces with atomic resolution. Using the new technique, innovative materials for information processing can be investigated and identified more easily. The oxide materials should help computers become more powerful and energy-efficient in future. Unlike other methods, the local-conductivity atomic force microscopy (LC-AFM) method used by the researchers can also be applied to surfaces with weak or inhomogeneous conductivity, which are typical of the material class.
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C. Rodenbücher et al., Local surface conductivity of transition metal oxides mapped with true atomic resolution,
Nanoscale, 2018, Advance Article, first published on 17 May 2018,
DOI: 10.1039/C8NR02562B.
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| 09 Apr 2020 |
Data Storage Concept: Flaws with Benefits
Jülich, 31 March 2020. In the production of nanoelectronic components, material defects are usually unwelcome as they can impair desired behaviour. However, new computer simulations by a team of physicists at Forschungszentrum Jülich show that such defects can also be useful. According to their studies, material defects – introduced using a targeted approach – could improve the performance of a certain class of data storage devices.
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Originalveröffentlichung: Defect-implantation for the all-electrical detection of non-collinear spin-textures; Imara Lima Fernandes, Mohammed Bouhassoune, Samir Lounis;
Nature Communications 2020, DOI: 10.1038/s41467-020-15379-6
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| 14 Mar 2019 |
Diattenuation Imaging – A promising imaging technique for brain research
Jülich, 19 March 2019 – A new imaging method provides structural information about brain tissue that was previously difficult to access. Diattenuation Imaging (DI), developed by scientists at Forschungszentrum Jülich and the University of Groningen, allows to differentiate, e.g., regions with many thin nerve fibres from regions with few thick nerve fibres. With current imaging methods, these tissue types cannot easily be distinguished.
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Menzel M, Axer M, Amunts K, De Raedt H, Michielsen K.
Diattenuation Imaging reveals different brain tissue properties.
Sci Rep. 2019;9:1939 (published 2019 Feb 13), DOI: 10.1038/s41598-019-38506-w
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