University of Groningen physicists have managed to alter the flow of spin waves through a magnet, using only an electrical current. This is a huge step towards the spin transistor that is needed to construct spintronic devices. These promise to be much more energy efficient than conventional electronics.
The results were published on 2 March in Physical Review Letters.
Spin is a quantum mechanical property of electrons. Simply put, it makes electrons behave like small magnetic compass needles which can point up or down. This can be used to transfer or store information, creating spintronic devices that promise several advantages over normal microelectronics.
In a conventional computer, separate devices are needed for data storage (often using a magnetic process) and data processing (electronic transistors). Spintronics could integrate both in one device, so it would no longer be necessary to move information between storage and processing units. Furthermore, spins can be stored in a non-volatile way, which means that their storage requires no energy, in contrast to normal RAM memory. All this means that spintronics could potentially make faster and more energy-efficient computers.
‘We described this spin transport through a magnet some time ago. Now, we’ve taken the next step: we wanted to influence the transport.’ This was done using a third platinum strip between injector and detector. By applying a positive or negative current, it is possible to either inject additional magnons in the conduction channel or drain magnons from it. ‘That makes our set up analogous to a field effect transistor. In such a transistor, an electric field of a gate electrode reduces or increases the number of free electrons in the channel, thus shutting down or boosting the current.’
The study shows that a YIG spin transistor can be made, and that in the long run this material could even produce a spin superconductor. The beauty of the system is that spin injection and control of spin currents is achieved with a simple DC current, making these spintronic devices compatible with normal electronics. ‘Our next step is to see if we can realize this promise’, concludes Van Wees.
The Latest on: Spin superconductor
via Google News
The Latest on: Spin superconductor
- g-wave superconductor comes into viewon November 11, 2020 at 4:00 pm
In such s-wave superconductors, which include materials like lead, tin and mercury, the Cooper pairs comprise one electron with spin up and one electron with spin down. As these electrons move head-on ...
- Connecting two classes of unconventional superconductorson November 10, 2020 at 4:00 pm
Different classes of unconventional superconductors share that superconductivity ... boundary region between the typical iron-pnictide spin-density-wave magnetism and a Ce-based Kondo-regime.
- A new candidate material for quantum spin liquidson November 9, 2020 at 8:00 am
In 1973, physicist and later Nobel laureate Philip W. Anderson proposed a bizarre state of matter: the quantum spin liquid (QSL). Unlike the everyday liquids we ...
- Low Dimensional Materials & Deviceson October 30, 2020 at 4:49 am
Left: The calculated Fermi surface of the pnictide superconductor LaFePO (without spin–orbit corrections) from Carrington et al 2009. Right: Crystal structure of the 1D conductor Li 0.9 Mo 6 O 17 from ...
- A Quantum Tango between Magnons and Phononson October 25, 2020 at 5:00 pm
A nanopatterned magnetic structure features an unprecedently strong coupling between lattice vibrations and quantized spin waves, which could lead to novel ways of manipulating quantum information.
- Overview of Working Groupon November 26, 2019 at 11:59 pm
He has served as Research Director of JST/CREST Projects; Nuclear Spin Network Quantum Computers (’99-05 ... Yasunobu Nakamura studied physical properties of high-temperature superconductors and ...
- RIKEN Nishina Center for Accelerator-Based Science RIKEN Facility Office at RALon October 14, 2019 at 8:43 am
"Magnetic Order in Pyrochlore Iridate Nd2Ir2O7 Probed by Muon Spin Relaxation" Phys. Rev. B 88, 060441(R)-1-5(2013) 3.I. Kawasaki, I. Watanabe, H. Amitsuka, H. Tanida, and Y. Ohnuki.: "Superconducting ...
via Bing News