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Primeur weekly 2017-04-03

Focus

Luxembourg capital of supercomputing in Europe ...

Quantum computing

Quantum communication: How to outwit noise ...

Rigetti Computing raises $64 million in Series A and B funding, led by Andreessen Horowitz and Vy Capital ...

Focus on Europe

HPC Summit Week 2017 in Barcelona to gather main HPC stakeholders in Europe ...

Six High Performance Computing centres in the UK to be officially launched ...

It is easier for a DNA knot ...

Prof. Dieter Kranzlmüller is new Chairman of the Board of Directors at Leibniz Supercomputing Centre ...

GW4 world-first ARM based production supercomputer launched at national exhibition in the UK ...

Middleware

New version of Univa Grid Engine 2x faster than Sun Grid Engine 6.2u5 ...

Huawei and Altair sign MoU to jointly pursue High-Performance Computing (HPC) opportunities and build industrial simulation Cloud solutions ...

Hardware

New HPC installation to deploy Asetek liquid cooling solution ...

HPE to acquire Nimble Storage to strengthen leadership in hybrid IT ...

New Supermicro rack scale design brings open management for on-demand Cloud scale data centres ...

Supermicro launches new Intel Optane SSD optimized platforms ...

GBP 3 million awarded to Oxford-led consortium for national machine learning computing facility ...

EPCC invests GB 2.4 million in Tier-2 Cirrus system ...

Eurotech continues to lead innovation in embedded and high-performance computing: New designs featuring 2nd generation Intel Xeon Phi and Intel Atom E39XX ...

Officials dedicate Ohio OSC's newest, most powerful supercomputer ...

USC's Information Sciences Institute tapped to produce computing chips technology ...

Applications

Supercomputer puts Colombia on fast track to designing new HIV drugs, science and engineering discovery ...

SDSC announces Annual Supercomputing & Data Science Workshop ...

IBM patents cognitive system to manage self-driving vehicles ...

Cryo-electron microscopy achieves unprecedented resolution using new computational methods ...

Psychologists enlist machine learning to help diagnose depression ...

A seismic mapping milestone ...

Information storage with a nanoscale twist ...

Nanomagnets for future data storage ...

Researchers shoot for success with simulations of laser pulse-material interactions ...

A system based on data science to predict student dropouts ...

The Cloud

Oracle unveils industry-first Cloud Converged Storage to help organisations bridge on-premises and Oracle Cloud storage ...

Information storage with a nanoscale twist


The torque needed to manipulate nanoscale magnetic whirlpools, represented here as red and blue regions with opposite signs, have now been revealed with high-powered synchrotron light. Credit: Reproduced with permission of 2016 American Physical Society.
28 Mar 2017 Thuwal - Swirling objects known as magnetic vortices and skyrmions can be miniaturized without sacrificing mobility, a KAUST-led international research team has found. These findings are relevant for future "race-track" memory technologies that feature massive densities of moveable magnetic bits.

In nanometer-thin magnetic films, such as iron-nickel alloys, the region separating two magnetic domains or defects can adopt tiny whirlpool-like patterns. Some of these patterns, called skyrmions, resist unraveling even when packed tightly together, and they can also be directed with small electric currents. These features have made the skyrmions attractive targets for research into high-capacity memory devices. One concept zips skyrmions around a loop then past a stationary read/write head to eliminate the need for mechanical components used in today's hard drives.

Aurelien Manchon, an Associate Professor of Material Science and Engineering at the University, noted that one of the main reasons for the appeal of skyrmions is their ability to avoid defects or uneven patches in thin films that would normally trap or "pin" a magnetic charge. However, this agility is compromised when researchers try to shrink skyrmions to the smallest size possible - the smaller they get the more likely they are to get pinned because of the relative increase in defect site dimensions.

To improve these devices, Aurelien Manchon and international collaborators tried to understand the fundamental momentum transfer between charge currents and magnetic whirlpools.

Using intense x-rays generated at Berkeley University's Advanced Light Source, the team captured time-resolved images of whirlpool patterns called magnetic vortices as they gyrated along a nanometer-wide half-ring track. By pinpointing the position of the vortex core from the imaging sequence, they obtained accurate data about a parameter, known as the non-adiabatic spin-transfer torque, which is crucial for electrical manipulations.

Surprisingly, the measured non-adiabatic torque was far greater than values predicted by existing models. To account for this discrepancy, a theoretical analysis by Aurelien Manchon showed the extra twisting was provided by another force - the emergent Hall effect, which occurs when electrons travel through a magnetic whirlpool.

"In a nutshell, electrons experience a force that pushes them sideways, but it doesn't come from the local magnetization itself; instead it arises from the topology of the magnetic texture", explained Aurelien Manchon. "This effect produces an extra spin-polarized current that exerts a torque on the whirlpool."

The researchers found that the additional non-adiabatic torque intensifies when the size of the whirlpool is reduced - a driving force that may offer a way to overcome defect pinning at the nanoscale. "This might be an interesting compromise to seek, especially in the context of skyrmion-based data storage", added Aurelien Manchon.

Source: King Abdullah University of Science &Technology - KAUST

Back to Table of contents

Primeur weekly 2017-04-03

Focus

Luxembourg capital of supercomputing in Europe ...

Quantum computing

Quantum communication: How to outwit noise ...

Rigetti Computing raises $64 million in Series A and B funding, led by Andreessen Horowitz and Vy Capital ...

Focus on Europe

HPC Summit Week 2017 in Barcelona to gather main HPC stakeholders in Europe ...

Six High Performance Computing centres in the UK to be officially launched ...

It is easier for a DNA knot ...

Prof. Dieter Kranzlmüller is new Chairman of the Board of Directors at Leibniz Supercomputing Centre ...

GW4 world-first ARM based production supercomputer launched at national exhibition in the UK ...

Middleware

New version of Univa Grid Engine 2x faster than Sun Grid Engine 6.2u5 ...

Huawei and Altair sign MoU to jointly pursue High-Performance Computing (HPC) opportunities and build industrial simulation Cloud solutions ...

Hardware

New HPC installation to deploy Asetek liquid cooling solution ...

HPE to acquire Nimble Storage to strengthen leadership in hybrid IT ...

New Supermicro rack scale design brings open management for on-demand Cloud scale data centres ...

Supermicro launches new Intel Optane SSD optimized platforms ...

GBP 3 million awarded to Oxford-led consortium for national machine learning computing facility ...

EPCC invests GB 2.4 million in Tier-2 Cirrus system ...

Eurotech continues to lead innovation in embedded and high-performance computing: New designs featuring 2nd generation Intel Xeon Phi and Intel Atom E39XX ...

Officials dedicate Ohio OSC's newest, most powerful supercomputer ...

USC's Information Sciences Institute tapped to produce computing chips technology ...

Applications

Supercomputer puts Colombia on fast track to designing new HIV drugs, science and engineering discovery ...

SDSC announces Annual Supercomputing & Data Science Workshop ...

IBM patents cognitive system to manage self-driving vehicles ...

Cryo-electron microscopy achieves unprecedented resolution using new computational methods ...

Psychologists enlist machine learning to help diagnose depression ...

A seismic mapping milestone ...

Information storage with a nanoscale twist ...

Nanomagnets for future data storage ...

Researchers shoot for success with simulations of laser pulse-material interactions ...

A system based on data science to predict student dropouts ...

The Cloud

Oracle unveils industry-first Cloud Converged Storage to help organisations bridge on-premises and Oracle Cloud storage ...