Magnetic whirls in future data storage devices
Magnetic (anti)skyrmions are microscopically small whirls that are found in special classes of magnetic materials. These nano-objects could be used to host digital data by their presence or absence in a sequence along a magnetic stripe. A team of scientists from the Max Planck institutes (MPI) of Microstructure Physics in Halle and for Chemical Physics of Solids in Dresden and the Martin Luther University Halle-Wittenberg (MLU) has now made the observation that skyrmions and antiskyrmions can coexist bringing about the possibility to expand their capabilities in storage devices. The results were published in the scientific journal “Nature Communications”.
With the ever-increasing volumes of digital data from the growing numbers of devices, the demand for data storage capacity has been enhanced dramatically over the past few years. Conventional storage technologies are struggling to keep up. At the same time, the ever-increasing energy consumption of these devices - hard disk drives (HDD) and random-access memories (RAM) - is at odds with a “green” energy landscape. Required are entirely new devices that have greater performance at a drastically reduced energy consumption.
A promising proposal is the magnetic racetrack memory-storage device. It consists of nanoscopic magnetic stripes (the racetracks) in which data is encoded in magnetic nano-objects, typically by their presence or absence at specified positions. One possible nano-object is a magnetic (anti)skyrmion: this is an extremely stable whirl of magnetization with a size that can be varied from micrometers to nanometers. These objects can be written and deleted, read and, most importantly, moved by currents, therefore allowing the racetrack to be operated without any moving parts. “By stacking several racetracks, one on top of each other, to create an innately three-dimensional memory-storage device, the storage capacity can be drastically increased compared to solid state drives and even hard disk drives. Moreover, such a racetrack memory device would operate at a fraction of the energy consumption of conventional storage devices. It would be much faster, and would be much more compact and reliable”, explains Prof Stuart Parkin, director of the MPI of Microstructure Physics in Halle and Alexander von Humboldt Professor at the MLU.
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