Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A new magnetoresistance effect occurring in materials with strong spin-orbit coupling

27.01.2016

These materials, which include metals such as platinum or tantalum, are characterized for being capable of generating a spin current from an electrical current (and viceversa) by means of the so-called spin Hall effect. For this reason, these materials are of outmost importance in the field of spintronics -the branch of science that is devoted to explore the generation, transmission and detection of spin currents in materials and devices.

The ultimate goal of spintronics is to have a deeper understanding of the charge-to-spin conversion and transport phenomena at the nanoscale in order to be able to design new functional and efficient devices that are not only based on the injection, transport and storage of electrical charge, but also to its spin, which could revolutionize the conventional electronics and expand its limits.


Top: Schematic of the direct spin Hall effect (and its inverse) in a thin film of a material with strong spin-orbit coupling. Bottom: schematic of the Hanle magnetoresistance effect when an external magnetic field is applied.

Credit: PR

The researchers show that, by means of this novel magnetoresistive effect, it is now possible to study the spin transport properties in these materials without the need to fabricate complex devices and/or involve interfaces between different materials.

When an electric current is applied to a thin film of a material with strong spin-orbit coupling (typically of a few nanometers thick), a spin current is generated in the transverse direction -that is, along the thickness of the film- via the direct spin Hall effect, which in turn produces an electric current (via the inverse spin Hall effect) that adds to the initial applied current.

This effect -small since it is due to a second-order correction-, causes a reduction in the resistivity of the film, and is maximum when the film thickness is on the order of to the spin diffusion length -that is, the average distance that a spin can travel through the material without suffering a collision that may cause a change in its state.

If a magnetic field is applied not collinear to the direction where the spins points to, one can force them to precess -via the so-called Hanle effect-, thereby generating a modulation in the resistivity of the material. According to Saul Velez, first author of the work, "this new phenomenon could open ahead the possibility to study the spin transport in materials and systems not yet explored".

"This new effect also allows to study the spin transport properties of known materials, and to compare the results with the ones obtained with other techniques or devices", adds Fèlix Casanova, last author and supervisor of the work.

Media Contact

Irati Kortabitarte
i.kortabitarte@elhuyar.com
34-943-363-040

Irati Kortabitarte | EurekAlert!

More articles from Materials Sciences:

nachricht New value added to the ICSD (Inorganic Crystal Structure Database)
27.03.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH

nachricht Argon is not the 'dope' for metallic hydrogen
24.03.2017 | Carnegie Institution for Science

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Northern oceans pumped CO2 into the atmosphere

27.03.2017 | Earth Sciences

Fingerprint' technique spots frog populations at risk from pollution

27.03.2017 | Life Sciences

Big data approach to predict protein structure

27.03.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>