Graphene and 2-D materials could move electronics beyond 'Moore's law'

Graphene and 2-D materials could move electronics beyond 'Moore’s law'
Illustration of emergent spintronic phenomena in a 2D van der Waals heterostructure. Graphene acts as an ideal spin-transport channel given its long spin-relaxation length. In the center of the channel two magnetic contacts are used to electrically inject or detect the spin current. The need for magnetic contacts is circumvented by using heterostructures of graphene and transition-metal dichalcogenides, which enable direct optical spin injection (top left) and direct charge-to-spin conversion (bottom right). Credit: Reviews of Modern Physics (2020). DOI: 10.1103/RevModPhys.92.021003

A team of researchers based in Manchester, the Netherlands, Singapore, Spain, Switzerland and the U.S. has published a new review on a field of computer device development known as spintronics, which could see graphene used as building block for next-generation electronics.

Recent theoretical and experimental advances and phenomena in studies of electronic spin transport in and related two-dimensional (2-D) materials have emerged as a fascinating area of research and development.

Spintronics is the combination of electronics and magnetism, at the nanoscale and could lead to next generation high-speed electronics. Spintronic devices are a viable alternative for nanoelectronics beyond Moore's law, offering higher energy efficiency and lower dissipation as compared to conventional electronics, which relies on charge currents. In principle we could have phones and tablets operating with spin-based transistors and memories.

As published today in APS Journal Review of Modern Physics, the review focuses on the new perspectives provided by heterostructures and their emergent phenomena, including proximity-enabled spin-orbit effects, coupling spin to light, electrical tunability and 2-D magnetism.

The average person already encounters spintronics in laptops and PCs, which are already using spintronics in the form of the magnetic sensors in the reading heads of hard disk drives. These sensors are also used in the automotive industry.

Spintronics is a new approach to developing electronics where both memory devices (RAM) and logic devices (transistors) are implemented with the use of 'spin', which is the basic property of electrons that cause them to behave like tiny magnets, as well as the electronic charge.

Dr. Ivan Vera Marun, Lecturer in Condensed Matter Physics at The University of Manchester said: "The continuous progress in graphene spintronics, and more broadly in 2-D heterostructures, has resulted in the efficient creation, transport, and detection of spin information using effects previously inaccessible to graphene alone.

"As efforts on both the fundamental and technological aspects continue, we believe that ballistic spin transport will be realized in 2-D heterostructures, even at room temperature. Such transport would enable practical use of the quantum mechanical properties of electron wave functions, bringing spins in 2-D materials to the service of future quantum computation approaches."

Controlled spin transport in graphene and other two-dimensional materials has become increasingly promising for applications in devices. Of particular interest are custom-tailored heterostructures, known as van der Waals heterostructures, that consist of stacks of in a precisely controlled order. This review gives an overview of this developing field of graphene spintronics and outlines the experimental and theoretical state of the art.

Billions of spintronics devices such as sensors and memories are already being produced. Every hard disk drive has a magnetic sensor that uses a flow of spins, and magnetic random access memory (MRAM) chips are becoming increasingly popular.

Over the last decade, exciting results have been made in the field of graphene spintronics, evolving to a next generation of studies extending to new two-dimensional (2-D) compounds.

Since its isolation in 2004, graphene has opened the door for other 2-D materials. Researchers can then use these materials to create stacks of 2-D materials called heterostructures. These can be combined with graphene to create new 'designer materials' to produce applications originally limited to science fiction.

Professor Francisco Guinea who co-authored the paper said: "The field of spintronics, the properties and manipulation of spins in materials has brought to light a number of novel aspects in the behavior of solids. The study of fundamental aspects of the motion of spin carrying electrons is one of the most active fields in the physics of condensed matter."

The identification and characterisation of new quantum materials with non-trivial topological electronic and magnetic properties is being intensively studied worldwide, after the formulation, in 2004 of the concept of topological insulators. Spintronics lies at the core of this search. Because of their purity, strength, and simplicity, two dimensional materials are the best platform where to find these unique topological features which relate quantum physics, electronics, and magnetism."

Overall, the field of spintronics in graphene and related 2-D materials is currently moving towards the demonstration of practical graphene such as coupled nano-oscillators for applications in fields of space communication, high‐speed radio links, vehicle radar and interchip communication applications.

More information: A. Avsar et al. Colloquium : Spintronics in graphene and other two-dimensional materials, Reviews of Modern Physics (2020). DOI: 10.1103/RevModPhys.92.021003

Journal information: Reviews of Modern Physics

Citation: Graphene and 2-D materials could move electronics beyond 'Moore's law' (2020, June 3) retrieved 10 December 2023 from
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