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
- Large Josephson current in Weyl nodal loop semimetals due to odd-frequency superconductivityon June 25, 2020 at 2:05 am
Weyl nodal loop semimetals (WNLs) host a closed nodal line loop Fermi surface in the bulk, protected zero-energy flat band, or drumhead, surface states, and strong spin-polarization. The large density ...
- The Theory of Superconductivity in the High-T"c" Cuprate Superconductorson June 21, 2020 at 6:35 pm
This book has been “in preparation” for over six years as I write this introduction. It started out as a joint venture of the entire Princeton group, based on a course of lectures in the spring term ...
- Simultaneous nodal superconductivity and broken time-reversal symmetry in CaPtAson June 17, 2020 at 6:36 am
In the vast majority of superconducting materials, Cooper pairs have what is known as even parity, which essentially means that their wave function does not change when electrons swap spatial ...
- Topological states from topological crystalson June 6, 2020 at 5:00 pm
Typical examples are topological insulators, topological superconductors, and the Haldane spin chain [hereinafter, if not explicitly stated otherwise, the terms “topological insulator” and “strong ...
- Nature of the spin resonance mode in CeCoIn 5on May 29, 2020 at 2:22 am
Here we show that for the heavy fermion superconductor CeCoIn 5, its SRM defies expectations for a spin-excitonic bound state, and is not a manifestation of sign-changing superconductivity.
- Self-induced spin glass state in elemental and crystalline neodymiumon May 28, 2020 at 10:49 am
3 School of Science and Technology, Örebro University, Örebro, Sweden. See allHide authors and affiliations Spin glasses that form in disordered materials such as magnetic alloys have locally varying ...
- Like Moses parting the sea: spontaneous segregation of a superconducting quantum fluid revealedon May 27, 2020 at 5:13 am
On the other hand, it seems much closer to superfluid helium-3, presenting a unique such case among unconventional superconductors ... the spins must choose between two equivalent states: spin-up and ...
- Accelerated Supercurrents Give Scientists Access To “Forbidden” Lighton May 20, 2020 at 11:26 am
To make their discovery, the scientists directed trillions of light pulses every second towards pairs of electrons (called Cooper pairs) that were flowing through a superconductor at an extremely ...
- Scientists use pressure to make liquid magnetism breakthroughon May 18, 2020 at 11:13 pm
something that would be required for full-scale implementation of superconductors in energy-conserving power grids. One idea put forth in 1987 by the late theorist Phil Anderson of Princeton ...
- A Twist on Particle Collisionson May 13, 2020 at 8:05 am
Theorists show that collisions between particles with orbital angular momentum could offer a new way to study intrinsic spin properties. Light with orbital angular momentum has a wave front that ...
via Bing News