SCMR effect simplifies the design of fundamental spintronic components
The transition from light bulbs to LEDs has drastically cut the amount of electricity we use for lighting. Most of the electricity consumed by incandescent bulbs was, after all, dissipated as heat. We may now be on the verge of a comparable breakthrough in electronic computer components. Up to now, these have been run on electricity, generating unwanted heat. If spin current were employed instead, computers and similar devices could be operated in a much more energy-efficient manner. Dr. Olena Gomonay from Johannes Gutenberg University Mainz (JGU) in Germany and her team together with Professor Eiji Saitoh from the Advanced Institute for Materials Research (AIMR) at Tohoku University in Japan and his work group have now discovered an effect that could make such a transition to spin current a reality. This effect significantly simplifies the design of fundamental spintronic components.
Touching a computer that has been running for some time, you will feel heat. This heat is an – undesirable – side effect of the electric current. Undesirable because the heat generated, naturally, also consumes energy. We are all familiar with this effect from light bulbs, which became so hot after being on for hours that they could burn your fingers. This is because light bulbs converted only a fraction of the energy required to do their job of creating light. The energy used by LEDs, on the other hand, is almost completely used for lighting, which is why they don’t become hot. This makes LEDs significantly more energy-efficient than traditional incandescent bulbs.
Instead of using an electric current composed of charged particles, a computer using a stream of particles with a spin other than zero could manipulate the material of its components in the same way to perform calculations. The primary difference is that no heat is generated, the processes are much more energy-efficient. Dr. Olena Gomonay from Mainz University and Professor Eiji Saitoh from Tohoku University have now laid the foundations for using these spin currents. More precisely, they have used the concept of spin currents and applied it to a specific material. Gomonay compares the spin currents involved with how our brains work: “Our brains process immeasurable amounts of information, but they don’t heat up in the process. Nature is, therefore, way ahead of us.” The team from Mainz is hoping to emulate this model.
Drastic change in current flow
How well spin currents flow depends on the material – just like in the case of electric current. While spin currents can always flow in ferromagnetic materials, in antiferromagnetic materials states with low resistance alternate with those with high resistance. “We have now found a way to control spin currents by means of a magnetic field and temperature, in other words, to control the resistance of an antiferromagnetic system based on spin,” explained Gomonay, summarizing her results.
At a temperature close to the phase transition temperature, Gomonay and her team applied a small magnetic field to the material. While the applied magnetic field alters the orientation of the spin currents to allow them to be easily transported through the material, the temperature has precisely two effects. On the one hand, a higher temperature causes more particles of the material to be in excited states, meaning there are more spin carriers that can be transported, which makes spin transport easier. On the other hand, the high temperature makes it possible to operate at a low magnetic field.
Thus the resistance and the current flow change drastically by several orders of magnitude. “This effect, which we call spin colossal magnetoresistance or SCMR for short, has the potential to simplify the design of fundamental spintronic components significantly,” explained the scientist from Mainz. This is particularly interesting for storage devices such as hard disks. This effect might be employed, for example, to create spin current switches as well as spin current based storage media.
The Latest on: Spintronics
via Google News
The Latest on: Spintronics
- Global Spintronics Market Size 2023, Share, Growth Rate, Future Outlook, New Trends, Major Company Profiles, Challenges and Opportunitieson January 14, 2021 at 4:33 pm
The “ Spintronics Market ” report offers important information on the business overview, market trends, product services, market size and share, growth rate, market dynamics, etc. These factors help ...
- Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCoon January 13, 2021 at 9:00 pm
Achieving ultrafast and energy-efficient optical control of magnetism beyond light's 'diffraction limit' could revolutionize information-processing technology. Towards this goal, researchers led by ...
- New Nanomagnetism Principle for Next-Generation Memory Deviceson January 13, 2021 at 7:19 am
The Korea Institute of Science and Technology (KIST) reports that a team of researchers under Dr Kyoung-Whan Kim from the Center for Spintronics has come up with a new principle for spin memory ...
- The changing paradigm of next-generation semiconductor memory developmenton January 11, 2021 at 9:42 pm
The Korea Institute of Science and Technology (KIST) has announced that the research team led by Dr. Kim Kyoung-Whan at the Center for Spintronics has proposed a new principle about spin memory ...
- Spintronics Achieves Breakthrough for Design of Low-Power Electronicson January 6, 2021 at 4:01 pm
Researchers at MIT have devised a new approach using spintronics to control magnetism in a microchip. Their method could pave the way for new designs in memory, computing, and sensing devices that ...
- Study demonstrates the quenching of an antiferromagnet into high resistivity stateson January 6, 2021 at 12:12 pm
A neglected mechanism in antiferromagnets may be key to spintronics More information: Quenching of an antiferromagnet into high resistivity states using electrical or ultrashort optical pulses ...
- Global Spintronics Technology Market 2021: In-Depth Analysis of Industry Share, Size, Growth Outlook and Opportunities to 2026on January 5, 2021 at 9:13 pm
Final Report will add the analysis of the impact of COVID-19 on this industry." Global "Spintronics Technology ...
- The University of Tokyo: Novel crystal confines electrons to one dimension for spintronic applicationson January 5, 2021 at 7:17 pm
Spintronics refers to a suite of physical systems which may one day replace many electronic systems. To realize this generational leap, material components that confine electrons in one dimension ...
- Old silicon learns new trickson January 5, 2021 at 4:00 pm
The defect-free pyramidal composition of the crystals impart magnetic properties that will enhance the functionality of 3D spintronics and other technologies. Ultrasmall integrated circuits have ...
via Bing News