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96 Current news of Helmholtz-Zentrum Berlin für Materialien und Energie

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Hidden talents: Converting heat into electricity with pencil and paper

21-Feb-2018

Thermoelectric materials can use thermal differences to generate electricity. Now there is an inexpensive and environmentally friendly way of producing them with the simplest of components: a normal pencil, photocopy paper, and conductive paint are sufficient to convert a temperature difference ...

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Antiferromagnetic dysprosium reveals magnetic switching with less energy

07-Nov-2017

HZB scientists have identified a mechanism with which it may be possible to develop a form of magnetic storage that is faster and more energy-efficient. They compared how different forms of magnetic ordering in the rare-earth metal named dysprosium react to a short laser pulse. They discovered ...

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Insight into a hidden order

23-Oct-2017

A specific uranium compound has puzzled researchers for thirty years. Although the crystal structure is simple, no one understands exactly what is happening once it is cooled below a certain temperature. Apparently, a “hidden order” emerges, whose nature is completely unknown.Now physicists have ...

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Solar hydrogen production by artificial leafs

Special treatment improves cheap metal oxide photoelectrodes

29-Aug-2017

Metal oxides are promising candidates for cheap and stable photoelectrodes for solar water splitting, producing hydrogen with sunlight. Unfortunately, metal oxides are not highly efficient in this job. A known remedy is a treatment with heat and hydrogen. An international collaboration has now ...

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Optical control of magnetic memory

New insights into fundamental mechanisms

29-Aug-2017

A research team at Helmholtz-Zentrum Berlin (HZB) has shown for the first time how laser modulation of magnetic properties in materials is influenced by thermal effects and how the process occurs under moderate experimental parameters. At the same time, the scientists discovered a previously ...

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New model for bimolecular reactions in nanoreactors

07-Aug-2017

Theoretical physicists have devised a mathematical model of two different molecules reacting within so called nanoreactors that act as catalysts. They gained surprising new insights as to what factors promote reactions and how to control and select them. The model is relevant for a wide range of ...

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Green IT: New switching process in non-volatile spintronics devices

24-Apr-2017

Physicists achieved a robust and reliable magnetization switching process by domain wall displacement without any applied fields. The effect is observed in tiny asymmetric permalloy rings and may pave the way to extremely efficient new memory devices. To construct magnetic memories, elements ...

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A new record at BESSY II: ten million ions in an ion trap cooled for the first time to 7.4 K

Magnetic ground states of dimeric nickel cations spectroscopically ascertained

30-Nov-2016

Previously it was only possible to cool down about one thousand ions to 7.5 K using buffer gas. However, a thousand ions are not nearly enough for spectroscopic analyses. The ion trap with this new method provides a new opportunity to use cryogenic X-ray spectroscopy to study the magnetism and ...

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Ionic liquids simplify laser experiments on liquid samples

20-Oct-2016

An HZB team has developed a new approach to conduct photoemission spectroscopy of molecules in solution. This has been difficult up to now because the sample needed to be situated in vacuum – but liquids evaporate. The work has now demonstrated it is feasible to replace the solvent with an ionic ...

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New combinations of materials for producing magnetic monopoles

12-Oct-2016

The new materials system consists of regular arrays of superconducting YBaCuO-dots covered with an extremely thin permalloy film. A shortly applied external magnetic field leads to the creation of supercurrents within the superconducting dots. These currents produce a complex magnetic field ...

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