Researchers working on the room temperature spintronics (SPIN) research project are the first in Europe to successfully produce GaMnN layers, which are ferromagnetic at room temperature. The layer properties were examined using electric, optic, x-ray and positron measurements. The Academy-funded SPIN project is comprised of four participating entities, i.e. the Helsinki University of Technology (HUT) Departments of Electron Physics, Optoelectronics and Physics laboratories and the VTT Technical Research Centre of Finland Microelectronics research institute.
Headed by Dr Markku Sopanen, the SPIN project focuses on the research of manganese-doped gallium arsenide and gallium nitride. Gallium nitride is the most promising material for use in spintronics components which are operated at room temperature. The project also produced the first GaMnAs tunneling diode component, whose electrical properties are closely dependent on magnetic fields. High-speed tunneling diodes are used in, for example, microwave technologies.
Previously, ferromagnetic III-V semiconductors that functioned at room temperature were a completely unknown entity. Advances made in recent years have increased the ranks of ferromagnetic semiconductors with such compounds as GaMnAs clusters, InMnAs and GaMnN, whose Curie temperature is considerably higher than room temperature. Ferromagnetic III-V semiconductors are among the most interesting new material sectors in electronics and optoelectronics. These materials have a wide range of possible applications, in which the spin of electrons is used in electronic components. Examples include magnetic storage devices, magnetic field sensors, magnetically-controlled devices, spin transistors, polarisation-controlled optoelectronics devices and even quantum computing.
Terhi Loukiainen | alfa
Tiny lasers from a gallery of whispers
20.09.2017 | American Institute of Physics
New quantum phenomena in graphene superlattices
19.09.2017 | Graphene Flagship
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...
Pathogenic bacteria are becoming resistant to common antibiotics to an ever increasing degree. One of the most difficult germs is Pseudomonas aeruginosa, a...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
20.09.2017 | Life Sciences
20.09.2017 | Power and Electrical Engineering
20.09.2017 | Physics and Astronomy