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
Significantly more productivity in USP lasers
06.12.2016 | Fraunhofer-Institut für Lasertechnik ILT
Shape matters when light meets atom
05.12.2016 | Centre for Quantum Technologies at the National University of Singapore
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
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