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Gigantic ultrafast spin currents by Staff Writers Vienna, Austria (SPX) May 26, 2016
In our computer chips, information is transported in form of electrical charge. Electrons or other charge carriers have to be moved from one place to another. For years scientists have been working on elements that take advantage of the electrons angular momentum (their spin) rather than their electrical charge. This new approach, called "spintronics" has major advantages compared to common electronics. It can operate with much less energy. However, it is difficult to create such a spin current, which is required in spintronics. In the journal Physical Review Letters, physicists from TU Wien (Vienna) have now proposed a new method to produce gigantic spin currents in a very small period of time. The secret is using ultra short laser pulses.
Magnets and Semiconductors "There have been attempts to send an electric current through a combination of magnets and semiconductors", says Professor Karsten Held (TU Wien). "The idea is to create a flux of electrons with uniform spin, which can then be used for spintronic circuits. But the efficiency of this method is very limited." Karsten Held and Marco Battiato found another way. In computer simulations, they analysed the behaviour of electrons in a thin layer of nickel when it is attached to silicon and hit with ultra short laser pulses. "Such a laser pulse has an overwhelming effect on the electrons in nickel", says Marco Battiato. They are swept away and accelerated towards the silicon. An electric field builds up at the interface between nickel and silicon, which stops the current. Electrons still keep on migrating between the nickel layer and silicon, but the motion in both directions cancel each other, there is no net charge transfer.
Spin Up and Spin Down When the electrons are scattered, they change their direction and lose energy. Therefore, the majority of the electrons which do make it all the way to the nickel-silicon interface are spin-up electrons. Electrons which move in the opposite direction have equal probabilities of being in the spin-up or spin-down state. This spin-selective effect leads to a dominance of spin-up electrons in the silicon. This means that a spin current has been injected into the silicon without creating a charge current. "Our calculations show that this spin-polarization is extremely strong - much stronger than we could create with other methods", says Marco Battiato. "And this spin flux can be created in femtoseconds." Time is of the essence: today's computer processors operate with gigahertz frequencies. Billions of operations per second are possible. Even higher frequencies in the terahertz range can only be reached with extremely fast elements. So far, the method has only been tested in computer simulations. But Battiato and Held are already working with experimentalists who want to measure this laser-triggered spin flux. "Spintronics has the potential to become a key technology of the next few decades", says Held. "With our spin injection method there is now finally a way to create ultrafast, extremely strong spin currents."
Related Links Vienna University of Technology Understanding Time and Space
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