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.
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.
Irati Kortabitarte | EurekAlert!
Spider silk key to new bone-fixing composite
20.04.2018 | University of Connecticut
Diamond-like carbon is formed differently to what was believed -- machine learning enables development of new model
19.04.2018 | Aalto University
Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.
Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.
Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
23.04.2018 | Physics and Astronomy
23.04.2018 | Physics and Astronomy
23.04.2018 | Trade Fair News