Novel Devices ♦ news digest
flip the poles by an electric signal without involving another magnet, a new generation of memories can be envisaged combining the merits of both charge and spin- based devices.
In order the shake a magnet electrically without involving an electro-magnet or another permanent magnet one has to step out of the realm of classical physics and enter the relativistic quantum mechanics. Einstein’s relativity allows electrons subject to electric current to order their spins so they become magnetic.
The researchers took a permanent magnet GaMnAs and by applying an electric current inside the permanent magnet they created a new internal magnetic cloud, which was able to manipulate the surrounding permanent magnet. The work has been published in the journal Nature Nanotechnology.
This work has been described in the paper, “An antidumping spin-orbit torque originating from the Berry curvature”, Nature Nanotechnology, by Kurebayashi, H., Sinova, J. et al.
DOI:10.1038/nnano.2014.15
III-Vs and silicon unite to quicken heart treatment
Scientists have created a transformative device using GaN, GaAs and silicon which is aimed at delivering treatment or predict an impending heart attack before a patient shows any physical symptoms
Using an inexpensive 3-D printer, biomedical engineers have developed a custom-fitted, implantable device with embedded sensors that could transform treatment and prediction of cardiac disorders.
Igor Efimov at the School of Engineering & Applied Science at Washington University in St. Louis and an international team of biomedical engineers and materials scientists have created a 3-D elastic membrane. This is made of a soft, flexible, silicon material that is precisely shaped to match the heart’s epicardium, or the outer layer of the wall of the heart.
Electrically shaken GaMnAs magnet (Credit of Jairo Sinova)
The observed phenomenon is closely related to the relativistic intrinsic spin Hall effect which Jörg Wunderlich, Jairo Sinova, and Tomas Jungwirth discovered in 2004 following a prediction of Sinova and co-workers in 2003. Since then it has become a text-book demonstration of how electric currents can magnetise any material.
“Ten years ago we predicted and discovered how electric currents can generate pure spin-currents through the intrinsic structure of materials. Now we have shown how this effect can be reversed to manipulate magnets by the current-induced polarisation. These new phenomena are a major topic of research today since they can lead to new generation of memory devices. Besides our on- going collaborations, this research direction couples very well with on-going experimental research here in Mainz. Being part of this world-leading research and working with superb colleagues is an immense privilege and I am very excited about the future,” says Sinova.
Pictured in the image above are Igor Efimov, the Lucy & Stanley Lopata Distinguished Professor of Biomedical Engineering working with Sarah Gutbrod, PhD candidate in biomedical engineering, in Efimov’s lab in Whitaker Hall.
Efimov and a team of researchers are developing a custom-fitted, implantable device that can deliver treatment or predict an impending heart attack before a patient shows any physical symptoms.
Current technology is two-dimensional and cannot cover the full surface of the epicardium or maintain reliable contact for continual use without sutures or adhesives.
The team can then print tiny sensors onto the membrane that can precisely measure temperature, mechanical strain and pH, among other markers, or deliver a pulse of electricity in cases of arrhythmia. Those sensors could assist physicians with determining the health of the heart, deliver treatment or predict an impending heart attack before a patient exhibits any physical signs.
The findings were published online in Nature Communications last week.
“Each heart is a different shape, and current devices are one-size-fits-all and don’t at all conform to the geometry
March 2014
www.compoundsemiconductor.net 155
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