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
UNH scientists help provide first-ever views of elusive energy explosion
16.11.2018 | University of New Hampshire
NASA keeps watch over space explosions
16.11.2018 | NASA/Goddard Space Flight Center
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
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