Southampton physicists join search for hidden magnetic states

Aug 24, 2012

Physicists from the University of Southampton were among the first researchers to use the new high magnetic-field beamline at Diamond Light Source, the UK's national synchrotron facility, to search for 'hidden magnetic states'.

If found, they will provide important confirmation of a theoretical model, which could have important applications in .

Diamond's new I10 Beamline for Advanced Dichroism Experiments (BLADE) beamline, which has 300,000 times the strength of the earth's magnetic field, is providing them with the tools for the search. The beamline was developed through a partnership of several UK universities, including Southampton.

A team led by Professor Peter de Groot, from Southampton's Quantum, Light and Matter Group, consisting of physicists from the University of Southampton, the Clarendon Laboratory at Oxford and the Magnetic Spectroscopy Group at Diamond, is looking for 'hidden magnetic states' in a type of magnet that has been identified as an ideal candidate for data storage. The composition of this magnetic film material is such that it provides sufficient energy barriers to prevent thermally-activated data loss, with the potential to relieve the present limit on the of hard disk drives.

Professor Graham Bowden from the University of Southampton explains: "We are using the 14 Tesla Oxford Instruments superconducting magnet on the BLADE beamline to study exchange-spring magnets. Our exchange-spring magnetic multilayers consist of alternating hard and soft-magnetic layers, in which the magnetisation arranges in spring-like magnetic nanostructures. Such magnets offer additional flexibility in optimising magnetic properties, with possibilities for superior data storage capabilities.

"So far we have identified at least three different classes of exchange-spring magnetic states. Being able to manipulate these states will mean that more than one piece of information can be stored at a given site. There are also 'hidden '. Accessing these new exchange-spring states and their switching processes would be an exciting breakthrough in the field of novel magnetic store media. It will provide important confirmation of the theoretical model developed for exchange spring magnets at Southampton."

The Southampton team has been allocated further beam time to continue this research in early 2013.

Senior Beamline Scientist on BLADE, Dr Peter Bencok adds: "The first results on the new high-field superconducting magnet represent an important milestone, not only for the beamline, but for the whole of Diamond. Its magnetic field of 14 Tesla is about six times stronger than the saturation magnetization of high purity iron. This beamline also enables studies at the lowest temperature at Diamond of 300 milliKelvin – a chilling minus 272.85 degrees Celsius. The team has worked hard to achieve this milestone and we are really pleased to see that BLADE is playing a key role in important new physics."

Explore further: Serial time-encoded amplified microscopy for ultrafast imaging based on multi-wavelength laser

add to favorites email to friend print save as pdf

Related Stories

SSRL Beamline 13 Achieves First Light

Feb 29, 2008

On February 14, the first light shone into the Stanford Synchrotron Radiation Laboratory's newest beamline. Beamline 13, which has been under construction for the past two years, will allow new types of soft ...

Recommended for you

A transistor-like amplifier for single photons

3 hours ago

Data transmission over long distances usually utilizes optical techniques via glass fibres – this ensures high speed transmission combined with low power dissipation of the signal. For quite some years ...

Timely arrival of Pharao space clock

Jul 28, 2014

ESA has welcomed the arrival of Pharao, an important part of ESA's atomic clock experiment that will be attached to the International Space Station in 2016.

First in-situ images of void collapse in explosives

Jul 25, 2014

While creating the first-ever images of explosives using an x-ray free electron laser in California, Los Alamos researchers and collaborators demonstrated a crucial diagnostic for studying how voids affect ...

User comments : 0