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Primeur weekly 2015-10-12

Special

EXA2CT project helps applications from industry partners scale better using appropriate solvers, programming models and proto apps ...

Mont-Blanc: Even with cheap technology it is possible to perform decent scientific computing ...

Exascale supercomputing

Seagate leading SAGE storage project for the Exascale funded by Horizon 2020 ...

Crowd computing

BOINC:FAST2015 conference proceedings are now available ...

SRBase project new to BOINC community ...

Quantum computing

Crucial hurdle overcome in quantum computing ...

Chance effect of lab's fluorescent lights leads to discovery ...

Focus on Europe

Joint e-IRG/ESFRI session on Policy Aspects of Research Infrastructures and e-Infrastructures of Global Scale at ICT2015 ...

A major proof of concept for brain simulation ...

Hardware

NSF grant funds purchase of new HPC system for the University of Houston  ...

Turkey's Anadolu University chooses HPC solution from Bright, Dell and Eduline ...

Expansion of HPC system at High Performance Computing Center Stuttgart completed: Hornet is now Hazel Hen ...

New processes in modern ReRAM memory cells decoded ...

High-powered supercomputer to boost Rocky Mountain research ...

SanDisk and HP launch partnership to create memory-driven computing solutions ...

Ohio Supercomputer Center in seach of name for newest supercomputer system ...

Superconductivity trained to promote magnetization ...

New IBM Linux servers infuse technology from OpenPOWER Foundation to run Big Data workloads at half the cost of x86 based servers ...

Dell acquires EMC for USD$67 billion ...

New OpenSwitch developers community accelerates data centre networking with a consistent, modern Open Source network OS ...

Applications

Early users to test new Burst Buffer on Cori ...

The Cloud

World's largest dedicated Cloud HPC system for bioinformatics ...

IBM plans to acquire Cleversafe to propel object storage into the hybrid Cloud ...

NVIDIA GPUs to accelerate Microsoft Azure ...

UC San Diego researchers team up with Illumina to speed-read your microbiome ...

Superconductivity trained to promote magnetization

In spin electronics - or spintronics - information is coded via the electron spin, which could be directed along or against particular axis - Credit: University of Hamburg / Forschungszentrum Jülich5 Oct 2015 Moscow - Superconductivity, which is almost incompatible with magnetic field, under certain conditions is able to promote magnetization. Russian scientist Natalya Pugach from the Skobeltsyn Institute of Nuclear Physics at the Lomonosov Moscow State University discovered this yet to be explained effect with her British colleagues, whose theory group headed by Professor Matthias Eschrig. They suggest that techniques based on this effect are able to move us closer to future supercomputers: spintronic devices. Their study was published in the prestigiousNature Physicsjournal.

The research team, which included Natalya Pugach from the Skobeltsyn Institute of Nuclear Physics, studied the interactions between superconductivity and magnetization in order to understand how to control electron spins (electron magnetic moments) and to create the new generation of electronics.

In traditional microelectronics information is coded via the electric charges. In spin electronics - or spintronics - information is coded via the electron spin, which could be directed along or against particular axis.

"Superconducting spintronic devices will demand far less energy and emit less heat. It means, that this technology will allow to create much more economical and stable computing machines and supercomputers", Natalya Pugach explained.

The main obstacle to the development of these devices lies in the fact, that the spins of the electron and of other charged particles are very difficult to control. The results of this new research show, that superconductors may be useful in the process of spin transportation, and ferromagnetics may be used to control spins.

Superconducting state is very responsive sensitive to magnetic fields: strong magnetic fields destroy it, but and superconductors expel the magnetic field completely. It is almost impossible to make ordinary superconductors and magnetic materials interact with each other due to their opposite magnetic ordering direction of magnetization: in magnetic layers storage the magnetic field tends to arrange spins in one direction, and the Cooper pair (BCS pair) in ordinary superconductors haves opposite spins.

"My colleagues experimented with devices called superconducting spin-valves. They look like a 'sandwich', made of nanolayers of ferromagnetic material, superconductor and other metals. By changing the direction of magnetization it is possible to control the current in superconductor. The thickness of layers is crucial, because in case of the 'thick' superconductor it is impossible to see any interesting effects", Natalya Pugach explained.

During the experiments scientists bombarded the experimental samples with muons (particles that resemble electrons, but are 200 times heavier) and analyzed their dissipation scattering. This method gave the researchers the possibility to understand, how the magnetization proceeds in different layers of the sample.

The spin-valve consisted of two ferromagnetic cobalt layers, one superconductive niobium layer with thickness of approximately 150 atoms and a layer of gold. In the experiment researchers discovered an unexpected effect: when magnetization directions in two ferromagnetic layers were not parallel, the interaction between these layers and superconductive layer produced induced magnetization in the gold layer, "overjumping" the superconductor. When scientists changed the magnetization directions in two layers, making them parallel, this effect almost disappeared: field intensity experienced twenty-fold decrease.

"This effect was unexpected. We were very surprised to discover it. Previously we tried to explain the results with another magnetization distribution pattern, that was predicted before, but in vain. We have some hypotheses, but we still do not have any complete explanation. But nevertheless this effect allows us to use the new method of manipulations with spins", Natalya Pugach stated.

It is quite possible, that the finding will allow development to develop conceptually new spintronic elements. According to Natalya Pugach, superconductive spintronics technologies may help to build supercomputers and powerful servers, whose energy consumption and heat emission create much more problems than in case of ordinary desktop computers.

"Development of computer technologies was based on semiconductors. They are good for personal computers, but when you use these semiconductors to build supercomputers, they produce heat and noise, demand powerful cooling systems. Spintronics allows to solve all these problems", Natalya Pugach concluded.

The study is available at http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys3486.html .
Source: Lomonosov Moscow State University

Back to Table of contents

Primeur weekly 2015-10-12

Special

EXA2CT project helps applications from industry partners scale better using appropriate solvers, programming models and proto apps ...

Mont-Blanc: Even with cheap technology it is possible to perform decent scientific computing ...

Exascale supercomputing

Seagate leading SAGE storage project for the Exascale funded by Horizon 2020 ...

Crowd computing

BOINC:FAST2015 conference proceedings are now available ...

SRBase project new to BOINC community ...

Quantum computing

Crucial hurdle overcome in quantum computing ...

Chance effect of lab's fluorescent lights leads to discovery ...

Focus on Europe

Joint e-IRG/ESFRI session on Policy Aspects of Research Infrastructures and e-Infrastructures of Global Scale at ICT2015 ...

A major proof of concept for brain simulation ...

Hardware

NSF grant funds purchase of new HPC system for the University of Houston  ...

Turkey's Anadolu University chooses HPC solution from Bright, Dell and Eduline ...

Expansion of HPC system at High Performance Computing Center Stuttgart completed: Hornet is now Hazel Hen ...

New processes in modern ReRAM memory cells decoded ...

High-powered supercomputer to boost Rocky Mountain research ...

SanDisk and HP launch partnership to create memory-driven computing solutions ...

Ohio Supercomputer Center in seach of name for newest supercomputer system ...

Superconductivity trained to promote magnetization ...

New IBM Linux servers infuse technology from OpenPOWER Foundation to run Big Data workloads at half the cost of x86 based servers ...

Dell acquires EMC for USD$67 billion ...

New OpenSwitch developers community accelerates data centre networking with a consistent, modern Open Source network OS ...

Applications

Early users to test new Burst Buffer on Cori ...

The Cloud

World's largest dedicated Cloud HPC system for bioinformatics ...

IBM plans to acquire Cleversafe to propel object storage into the hybrid Cloud ...

NVIDIA GPUs to accelerate Microsoft Azure ...

UC San Diego researchers team up with Illumina to speed-read your microbiome ...