Back to Table of contents

Primeur weekly 2013-09-30

Focus

2013: Another year on the road to Exascale - An Interview with Thomas Sterling and Satoshi Matsuoka - Part I ...

The Cloud

VEP 2.1 is now available ...

Cloud-for-Europe gears up for the future ...

Cloud computing must tackle the security challenge ...

European Space Agency delivers its SuperSites Exploitation Platform on Interoute Virtual Data Centre ...

Oracle announces roadmap for Nimbula Director and OpenStack API integration with Oracle Exalogic Elastic Cloud ...

IBM announces US $17 million investment in new Cloud data centre ...

HP Enterprise Services launches new Cloud-based Analytics as a Service based on HP’s Big Data analytics platform ...

EuroFlash

Bull and Sinequa announce unmatched performance on bullion servers, enabling new real time Big Data experience ...

ADVA Optical Networking shows first SDN-automated end-to-end provisioning for dispersed data centres ...

European Landscape Study of Research Data Management ...

HPC Midlands and Bull lead the way in making supercomputing accessible to industry ...

Domain walls as new information storage medium ...

Counting on neodymium ...

USFlash

CoolIT Systems selected by CoinTerra to partner for liquid cooling solutions ...

Agilent Technologies accelerates smartphone and defense simulations by a factor of 64 ...

University of Utah's Christopher Johnson, leader in scientific visualization and computing, will receive 2013 IEEE Computer Society Sidney Fernbach Award ...

LSU researchers receive $4 million NSF grant for new supercomputing cluster ...

Convey Computer launches hybrid-core Memcached appliance - speeds performance, reduces cost of ownership ...

Terascala advances its vision of optimizing high-performance computing work flows for faster time to results ...

Teradata named in two Dow Jones Sustainability Indices for 4th consecutive year ...

Clot busting simulations test potential stroke treatment ...

Supercomputers help solve a 50-year homework assignment ...

Domain walls as new information storage medium


André Bisig, Institute of Physics, Johannes Gutenberg University Mainz
23 Sep 2013 Mainz - While searching for ever smaller devices that can be used as data storage systems and novel sensors, physicists at Johannes Gutenberg University Mainz (JGU) have directly observed magnetization dynamics processes in magnetic nanowires and thus paved the way for further research in the field of nanomagnetism. Small magnetic domain wall structures in nanowires can be used to store information and, for example, can be used as angle sensors. Initial applications based on magnetic domain walls have been developed and are already in use in sensor technology. The current findings represent the first experimentally recorded direct imaging of predicted correlations between magnetic spin structure and wall velocity. The newly discovered properties could be used for other future applications in information technology.

Magnetic domains represent regions of uniform magnetization in ferromagnetic materials. Within each domain, the magnetization is aligned in a single direction. At the interface where domains of different magnetization direction meet, the magnetization has to rotate from one direction to another in a so-called domain wall. At Mainz University, the group of Professor Mathias Kläui is studying the properties of magnetic domains and the dynamics of domains and domain walls in tiny rings on the nanoscale. It is possible to directly observe the motion of domain walls in these rings that have a diameter of some 4 micrometers and are made of permalloy, a soft nickel-iron alloy. For this purpose, the Mainz physicists have been collaborating with scientists of the BESSY II synchrotron facility at the Helmholtz Center Berlin for Materials and Energy and the Advanced Light Source (ALS) at the Lawrence Berkeley National Laboratory, Berkeley, USA, as well as with the Technical University of Berlin and the Max Planck Institute for Intelligent Systems in Stuttgart.

The researchers discovered that the velocity of the motion of domain walls is always oscillating. "This is a new effect that could prove to be useful in the future", stated Dr. André Bisig, lead author of the paper "Correlation between spin structure oscillations and domain wall velocities", which has recently been published inNature Communications. It was also found that the applied method is very effective in reliably moving the domain walls at very high velocities. "The faster we move the domain wall, the easier it is to control it", stated André Bisig. Another observation concerns the effects associated with irregularities or defects in the nanowires. According to the results, these effects only become noticeable when domain walls are moving slowly. The faster a domain wall spins, the less relevant is the role played by defects in the material.

While theoretical research concerns itself principally with observing domain wall velocity and its correlation with oscillations in the spin structure, the results obtained also have important implications for applied research. Domain wall-based sensors are already being used by Sensitec GmbH, Mainz, a co-operating partner of JGU and the Technical University of Kaiserslautern in two projects funded by the state of Rhineland-Palatinate: the Spintronics Technology Platform in Rhineland-Palatinate (STeP) and the Technology Transfer Service Center for New Materials (TT-DINEMA). "Of particular importance is the fact that we observed unimpeded domain wall motion at high domain wall velocities. This represents highly promising potential for the use of these nanostructures in ultra-fast rotating sensors", added Professor Mathias Kläui. The research being undertaken by Professor Kläui's team is being funded by an ERC Starting Grant and the Graduate School of Excellence Materials Science in Mainz (MAINZ). In addition, co-operation with Sensitec has resulted in access to a joint EU project involving seven other leading partners expected to start in October 2013 on "Controlling domain wall dynamics for functional devices".
Source: Johannes Gutenberg Universitaet Mainz

Back to Table of contents

Primeur weekly 2013-09-30

Focus

2013: Another year on the road to Exascale - An Interview with Thomas Sterling and Satoshi Matsuoka - Part I ...

The Cloud

VEP 2.1 is now available ...

Cloud-for-Europe gears up for the future ...

Cloud computing must tackle the security challenge ...

European Space Agency delivers its SuperSites Exploitation Platform on Interoute Virtual Data Centre ...

Oracle announces roadmap for Nimbula Director and OpenStack API integration with Oracle Exalogic Elastic Cloud ...

IBM announces US $17 million investment in new Cloud data centre ...

HP Enterprise Services launches new Cloud-based Analytics as a Service based on HP’s Big Data analytics platform ...

EuroFlash

Bull and Sinequa announce unmatched performance on bullion servers, enabling new real time Big Data experience ...

ADVA Optical Networking shows first SDN-automated end-to-end provisioning for dispersed data centres ...

European Landscape Study of Research Data Management ...

HPC Midlands and Bull lead the way in making supercomputing accessible to industry ...

Domain walls as new information storage medium ...

Counting on neodymium ...

USFlash

CoolIT Systems selected by CoinTerra to partner for liquid cooling solutions ...

Agilent Technologies accelerates smartphone and defense simulations by a factor of 64 ...

University of Utah's Christopher Johnson, leader in scientific visualization and computing, will receive 2013 IEEE Computer Society Sidney Fernbach Award ...

LSU researchers receive $4 million NSF grant for new supercomputing cluster ...

Convey Computer launches hybrid-core Memcached appliance - speeds performance, reduces cost of ownership ...

Terascala advances its vision of optimizing high-performance computing work flows for faster time to results ...

Teradata named in two Dow Jones Sustainability Indices for 4th consecutive year ...

Clot busting simulations test potential stroke treatment ...

Supercomputers help solve a 50-year homework assignment ...