Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Efficient conversion from spin currents to charge currents in a superconductor

24.06.2015

Paving the way to future superconducting spintronics devices

A University of Tokyo research group has successfully measured the spin Hall effect in a superconductor for the first time. The spin Hall effect is responsible for the conversion of magnetic flow to current flow and has not been thoroughly examined in superconductors.


Schematic illustration of the device for measuring the SHE in a superconductor Spin injection current (I) between the ferromagnet (Py) and nonmagnet (copper: Cu) generates pure spin currents (JS) in the copper. Pure spin currents flow through the copper into a superconductor (niobium nitride: NbN), and are converted into charge currents (JQ) via the SHE inside the niobium nitride.

Copyright : © 2015 Taro Wakamura

Spintronics, or electronics exploiting electron spin, is a research field that has been attracting growing interest in recent decades. It enables us to transmit and manipulate information with lower energy consumption owing to suppression of the Joule heating effect by using pure spin currents, a flow of electrons’ spin angular momentum without any charge flow.

Pure spin currents can be generated and detected via the spin Hall effect (SHE). The amplitude of the SHE depends on the material. A larger SHE indicates more efficient conversion between charge current and spin current, thus many studies have been carried out to discover materials which exhibit a larger SHE.

Whereas normal metals such as platinum or tungsten are regarded as promising candidates for obtaining large SHE, little attention has been paid to SHE in superconductors.

Professor Otani’s research group in the Institute for Solid State Physics has reported the first observation of SHE in a superconductor. The group prepared a device using niobium nitride, and measured the SHE in the superconducting and normal states.

Exploiting the unconventional electronic character of superconductors, the SHE in the superconducting state becomes more than 2,000 times larger than that in the normal state.

This outcome moves forward on realization of spin logic circuits and future development of superconducting spintronics devices.


Associated links
UTokyo Research article

Euan McKay | ResearchSEA
Further information:
http://www.researchsea.com

More articles from Power and Electrical Engineering:

nachricht A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes
20.07.2018 | Science China Press

nachricht Future electronic components to be printed like newspapers
20.07.2018 | Purdue University

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Future electronic components to be printed like newspapers

A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.

The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes

20.07.2018 | Power and Electrical Engineering

Reversing cause and effect is no trouble for quantum computers

20.07.2018 | Information Technology

Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern

20.07.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>