Controlling magnetic spin with electric fields

June 19, 2018, Ecole Polytechnique Federale de Lausanne
Hugo Dil and Juraj Krempasky at the Paul Scherrer Institut. Credit: H. Dil/EPFL

EPFL physicists have found a way to reverse electron spins using electric fields for the first time, paving the way for programmable spintronics technologies.

Spintronics is a of physics that studies the spin of electrons, an intrinsic type of magnetism that many elementary particles have. The field of spintronics has given rise to technological concepts of " devices," which would run on , rather than their charge, used by traditional electronics.

In order to build programmable spintronic devices we first need to be able to manipulate spins in certain materials. So far, this has been done with magnetic fields, which are not easy to integrate into everyday applications.

In a new set of experiments, an international team of physicists led by Hugo Dil at EPFL have now demonstrated the ability to control what they call "the spin landscape" using electric fields. They accomplished this in a new class of materials based on germanium telluride (GeTe), which is the simplest ferroelectric material operating at room temperature.

The scientists used a technique called spin- and (SARPES), which can measure the spin of electrons, and has been perfected by Dil's lab. By combining SARPES with the possibility to apply an electric field, the physicists demonstrate electrostatic spin manipulation in ferroelectric α-GeTe and multiferroic (GeMn)Te.

In addition, the scientists were able to follow the spins' switching pathway in detail. In (GeMn)Te, the perpendicular spin component switches due to electric-field-induced magnetization reversal. This provides firm evidence of magneto-electric coupling, which opens up the possibility of programmable semiconductor based spintronics.

"Our previous work showed that magnetic fields can control spins in these ," says Dil. "And now we've shown that spin manipulation is also possible using electric fields. Our experimental findings open up a promising path to only use electric fields in a spintronics device, strongly reducing the energy consumption."

Explore further: Diamonds show promise for spintronic devices

More information: J. Krempaský et al. Operando Imaging of All-Electric Spin Texture Manipulation in Ferroelectric and Multiferroic Rashba Semiconductors, Physical Review X (2018). DOI: 10.1103/PhysRevX.8.021067

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holoman
not rated yet Jun 19, 2018
UV photon induced electric field poling

https://drive.goo...c06vLT90

milnik
1 / 5 (1) Jun 20, 2018
Science has not yet understood the natural laws of motion or particles of matter or celestial bodies. So they do not know what spin is and how it occurs when forming matter from the substance Aether that fills the infinite universe. Kinetic energy of radial velocity causes spin and particles and bodies. How ? If someone wants to find out, he must ask a powerful scientific institution to arrange an agreement with him to publish it, but not to pay for that announcement, but to be rewarded with an appropriate prize.

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