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Primeur weekly 2018-04-23

Special

Commissioner Mariya Gabriel sees a growing sense of community in EuroHPC exascale initiative ...

Focus

ETAIS and eInfraCentral: a national and a European approach for offering e-Infrastructure services ...

Exascale supercomputing

The Exascale Computing Project (ECP) appoints GE's Brunon (Dave) Kepczynski as Industry Council Chair ...

Quantum computing

Novel thermal phases of topological quantum matter in the lab ...

Focus on Europe

ISC STEM Student Day opens for sign-up, includes free HPC & Machine Learning tutorial ...

Key role for University of Bristol in new supercomputer collaboration ...

e-IRG Open Workshop to focus on EuroHPC and development of e-Infrastructures in South-Eastern European (SEE) and Eastern-Mediterranean (EM) region ...

The JUWELS supercomputer in Juelich ...

KTH Sweden to organize PDC Summer School - Introduction to High Performance Computing ...

Hardware

Memorandum of Understanding on future international collaboration projects ...

New direct link from South Africa enables global science ...

Integrating optical components into existing chip designs ...

Russian RSC Group deployed the world first 100% hot water liquid cooled supercomputer at Joint Institute for Nuclear Research ...

DDN Storage builds major new engineering facility in Colorado focused on solving AI, Cloud and large-scale enterprise data challenges ...

Cray debuts AMD EPYC processors in supercomputer product line ...

Fujitsu upgrades RIKEN's AI research computer RAIDEN; reaches top tier of processing performance in Japan ...

Fujitsu launches new GS21 mainframe models supporting next-generation mission-critical systems ...

Applications

EMBO Practical Course on Integrative modelling of biomolecular interactions at Barcelona Supercomputing Center ...

Your digital twin: closer than you think - How computer models can predict health and help to prevent and cure diseases ...

From insulator to conductor in a flash ...

Oregon scientists decipher the magma bodies under Yellowstone ...

Some superconductors can also carry currents of 'spin' ...

Improving citizen science and big data analysis ...

Diamond-like carbon is formed differently to what was believed - machine learning enables development of new model ...

AI projected to replace thousands of banking jobs ...

The Cloud

UTSA Open Cloud Institute supports Cloud research & launches certificate programme ...

Some superconductors can also carry currents of 'spin'


This is a conceptual image of spin current flow in a superconductor. Credit: Jason Robinson.
16 Apr 2018 Cambridge - Researchers have shown that certain superconductors - materials that carry electrical current with zero resistance at very low temperatures - can also carry currents of 'spin'. The successful combination of superconductivity and spin could lead to a revolution in high-performance computing, by dramatically reducing energy consumption.

Spin is a particle's intrinsic angular momentum, and is normally carried in non-superconducting, non-magnetic materials by individual electrons. Spin can be 'up' or 'down', and for any given material, there is a maximum length that spin can be carried. In a conventional superconductor electrons with opposite spins are paired together so that a flow of electrons carries zero spin.

A few years ago, researchers from the University of Cambridge showed that it was possible to create electron pairs in which the spins are aligned: up-up or down-down. The spin current can be carried by up-up and down-down pairs moving in opposite directions with a net charge current of zero. The ability to create such a pure spin supercurrent is an important step towards the team's vision of creating a superconducting computing technology which could use massively less energy than the present silicon-based electronics.

Now, the same researchers have found a set of materials which encourage the pairing of spin-aligned electrons, so that a spin current flows more effectively in the superconducting state than in the non-superconducting (normal) state. Their results are reported in the journal Nature Materials .

"Although some aspects of normal state spin electronics, or spintronics, are more efficient than standard semiconductor electronics, the large-scale application has been prevented because the large charge currents required to generate spin currents waste too much energy", stated Professor Mark Blamire of Cambridge's Department of Materials Science and Metallurgy, who led the research. "A fully-superconducting method of generating and controlling spin currents offers a way to improve on this."

In the current work, Professor Blamire and his collaborators used a multi-layered stack of metal films in which each layer was only a few nanometres thick. They observed that when a microwave field was applied to the films, it caused the central magnetic layer to emit a spin current into the superconductor next to it.

"If we used only a superconductor, the spin current is blocked once the system is cooled below the temperature when it becomes a superconductor", stated Professor Blamire. "The surprising result was that when we added a platinum layer to the superconductor, the spin current in the superconducting state was greater than in the normal state."

Although the researchers have shown that certain superconductors can carry spin currents, so far these only occur over short distances. The next step for the research team is to understand how to increase the distance and how to control the spin currents.

The research was funded by the Engineering and Physical Sciences Research Council (EPSRC).

Source: University of Cambridge

Back to Table of contents

Primeur weekly 2018-04-23

Special

Commissioner Mariya Gabriel sees a growing sense of community in EuroHPC exascale initiative ...

Focus

ETAIS and eInfraCentral: a national and a European approach for offering e-Infrastructure services ...

Exascale supercomputing

The Exascale Computing Project (ECP) appoints GE's Brunon (Dave) Kepczynski as Industry Council Chair ...

Quantum computing

Novel thermal phases of topological quantum matter in the lab ...

Focus on Europe

ISC STEM Student Day opens for sign-up, includes free HPC & Machine Learning tutorial ...

Key role for University of Bristol in new supercomputer collaboration ...

e-IRG Open Workshop to focus on EuroHPC and development of e-Infrastructures in South-Eastern European (SEE) and Eastern-Mediterranean (EM) region ...

The JUWELS supercomputer in Juelich ...

KTH Sweden to organize PDC Summer School - Introduction to High Performance Computing ...

Hardware

Memorandum of Understanding on future international collaboration projects ...

New direct link from South Africa enables global science ...

Integrating optical components into existing chip designs ...

Russian RSC Group deployed the world first 100% hot water liquid cooled supercomputer at Joint Institute for Nuclear Research ...

DDN Storage builds major new engineering facility in Colorado focused on solving AI, Cloud and large-scale enterprise data challenges ...

Cray debuts AMD EPYC processors in supercomputer product line ...

Fujitsu upgrades RIKEN's AI research computer RAIDEN; reaches top tier of processing performance in Japan ...

Fujitsu launches new GS21 mainframe models supporting next-generation mission-critical systems ...

Applications

EMBO Practical Course on Integrative modelling of biomolecular interactions at Barcelona Supercomputing Center ...

Your digital twin: closer than you think - How computer models can predict health and help to prevent and cure diseases ...

From insulator to conductor in a flash ...

Oregon scientists decipher the magma bodies under Yellowstone ...

Some superconductors can also carry currents of 'spin' ...

Improving citizen science and big data analysis ...

Diamond-like carbon is formed differently to what was believed - machine learning enables development of new model ...

AI projected to replace thousands of banking jobs ...

The Cloud

UTSA Open Cloud Institute supports Cloud research & launches certificate programme ...