Magnetic waves in future data storage devices

Magnetic waves in future data storage devices

Schematic representation of magnetization in an advanced rocket memory database. Skyrmions (blue) and antiskyrmions (red) are "1" and "0" bits, respectively. Credit: Dr. Börge Göbel / MLU

Magnetic (anti) scrimmages are microscopically small whirls found in special classes of magnetic materials. These nano objects can be used to host digital data, in the presence or absence of it, along the magnetic strip. The Max Planck Group of Sciences (MPI) for Structural Physics at Halle and Dresden in Solid Chemical Physics and the Martin Luther University Hale-Wittenberg (MLU) team of scientists have now determined that scrimmages and antichrists can coexist in storage devices. The results are published in the scientific journal The nature of communications.

With the ever-increasing volume of digital data from the growing number of devices, the demand for data storage capacity has increased dramatically in the last few years. Conventional storage technologies try to keep up. At the same time, the ever-increasing power consumption of these devices – hard disk drive (HDD) and random access memory (RAM) is at odds with the "green" energy landscape. Completely new appliances that are more capable of delivering dramatically reduced power consumption are needed.

A promising proposition is a magnetic rocket storage device. It consists of nanoscopic magnetic stripes (missiles), in which data is encrypted in magnetic nano-objects, usually in the presence or absence of positions. One possible nano object is magnetic (anti) scrimion: it is a highly stable magnetization wave with a size that can vary from micrometer to nanometer. Writing and deleting these objects, reading them and, most importantly, moving them with guns, so it allows the missile to control any moving parts. "By leveraging several missiles on top of each other, creating an integrated three-dimensional memory storage device, the storage capacity can be dramatically increased compared to hard drives and hard drives. Moreover, such a missile memory device. He worked on the power consumption part of conventional storage devices. It would be much faster and would be much more compact and reliable, "explains Prof. Stuart Parkin, MPI Director of Microstructure Physics in Halle, and Alexander von Humboldt Professor of MLU.

"Skyrmions and antiskyrmions are 'opposite' magnetic whirls. However, until recently, it was believed that these two different objects could only exist in materials of different classes." Professor Ingrid Mertig of the MLU Institute of Physics explains. The Max Planck Institutes in Halle and Dresden and the MLU research team have found that antibodies and scrimmages can coexist in the same material under certain conditions. Dr. Bourge Gibel, a member of the Mertigs scientific team, provided a theoretical explanation for the unexpected experimental observations made by Jagnett Jenna in the Parkin group. One of the measured crystalline materials, Hussler compounds, was prepared by Dr. Vivek Kumar in Dresden, MPI in the group of Professor Claudia Feller.

Skyrmions and antiskyrmions are stabilized in different materials by magnetic interaction that is directly related to the structure of the host material. In some materials only skyrmions can be formed, while in other materials antichirms energetically favor this interaction. However, what has not been overlooked before is that the individual magnets ("magnetic dipoles") in each material also interact significantly with each other through their dipole-dipole interactions. This interaction always prefers scrimmages. For this reason, even "antichrome materials" can reveal scrimmages (but not vice versa). This becomes desirable as the temperature drops. At critical transition temperatures, two distinct objects are inherent.

In addition to its fundamental relevance, this finding allows for the creation of an advanced version of racetrack memory data storage, where, for example, bit sequences can be encrypted with skyrmions ("1" bit) and antiskyrmions ("0" bit). This concept would be more reliable than conventional missiles.

Bit data goes to anti-scripts

More info:
Jagannath Jena et al, Elliptical Bloch skyrmion chiral twins in antiskyrmion system, The nature of communications (2020). DOI: 10.1038 / s41467-020-14925-6

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Magnetic Waves in Upcoming Data Storage Devices (2020, March 3)
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