17.08.2021 – 14:11
University of Constance
- PI NR. 83_2021, dated ~ tiferromagneten.pdf
PDF – 160 kB
On the way to faster and more efficient data storage
A research team with the participation of Constance University has identified magnetic phenomena in antiferromagnets, which could lead to the development of faster and more efficient data storage devices.
How do magnetic waves work and propagate in antifreeze magnets, and are they traded as candidates for future data storage? What role do the so-called “domain walls” play? These are questions Current release An international research team led by Dr. Constance, a physicist. David Bosini was recently published in Business Magazine Physical examination letters Has appeared. In the article, the researchers describe the magnetic phenomena in antiferromagnets, which can be induced by very short laser pulses in the femo second range and with its help materials can provide new functions for use as energy efficient and high speed data storage devices in the future.
Demand for storage capacity is growing faster than related infrastructure
The rapid increase in big data technologies and the use of cloud-based services is leading to a steady growth in global demand for both data storage and data processing faster. However, existing technologies cannot absorb this for long. “Estimates suggest that unless new, skilled technicians for data storage and processing are created, the growing demand can only be met for a limited period of about 10 years,” says Dr. David Bocini, physicist at Constance University and the first author of the current study.
To avoid a data crisis, providing a large amount of storage capacity may not be enough. Standard technologies need to become faster and more energy efficient than standard mass storage devices. One type of material that is being traded as a promising candidate and resource for the development of next generation information technology is called antiferro magnets.
System of antifungal magnets
We all know the permanent magnets called iron or other ferromagnetic materials from our daily life. In them, the modified arrangement of the magnetic moments of the neighboring atoms – which can be visualized like tiny compass needles – creates a magnetic polarity or “magnetization” that acts close to the magnet. The so-called antiferromagnets, on the other hand, change the orientation of the magnetic moments between neighboring atoms so that they cancel each other out. Antiferro magnets have no net magnetization – they appear to be “non-magnetic” on the outside.
Inside, antifungal magnetic bodies are subdivided into a large number of smaller parts called domains, which differ in their respective orientations of oppositely arranged magnetic moments. At their interfaces, these domains are separated by interchangeable areas, referred to as “domain walls”. “Although these changes are found everywhere in antiferromagnets, little is known before about the influence of domain walls on the magnetic properties of antiferromagnets, especially when viewed over very short periods of time,” says Bosini.
Magnetic events in the femtosecond range
In their current featured article, the researchers describe what happens when antiferro magnets – in this case nickel oxide crystals – are excited by ultrasound laser pulses in the femtosecond range. The femtosecond scale covers very short periods of time, during which light can only cover very short distances
An international research team was able to show that domain walls play an active role in the dynamic properties of antifungal magnets. In particular, experiments showed that magnetic waves of different frequencies can be induced, amplified, and even linked across domain boundaries. However, this is only possible in the presence of domain walls. “Postney explains the importance of his study,” he said, adding that our observations show how antiferromagnets can be used to illustrate objects with new functions over a period of time. “
Important steps for highly efficient data storage
Combining different magnetic waves through domain walls shows the possibility of actively controlling the transient and spatial propagation of magnetic waves and the energy transfer between individual waves of matter – in the femtosecond range. Both are prerequisites for using high-speed processing and data storage materials.
Compared to conventional storage technologies, such antiferromagnetic based technologies are faster, more energy efficient, and can store and process data at higher densities. In the absence of net magnetization, the data will be better protected from external interference and manipulation. Future technologies based on antifungal magnets will meet all the requirements placed on next generation data storage devices. It will give you the energy to meet the growing demand for storage space and data processing capabilities, ”says Bosini.
- Original Pulpification: D. Posini, M. Pangaldi, L .; Sama, M. Pasini, F. Mertens, M. Cincinnati, d. Sato, o. Comone, s. Ponetti (2021) is an antiferro magnet with ultrafast amplification and a linear magnetolytic coupling of the Connaught Magnon models. Physical examination letters. DOI: https://doi.org/10.1103/PhysRevLett.127.077202
- Investigation of the role of domain walls for the dynamic properties of antiferromagnets in the femtosecond range
- If the domain has walls, magnetic waves of different frequencies can be induced in the object (nickel oxide) with the help of laser pulses, amplifying them across the domain boundaries.
- The active control of the transient and spatial propagation of magnetic waves and the transfer of energy between individual waves in antiferromagnets ensures constant data storage and the use of materials for technologies.
- Ferderung: Deutsche Forschungs Mainsoft (DFG), European Cooperation in Science and Technology (COST), Nutt and Alice Wallenberg Foundation, Swedish Research Council (VR), European Research Council (ERC) and National Science Foundation (NSF).
Note to authors:
An image can be downloaded below:
Topic: With the help of laser pulses in the femtosecond range, magnetic waves (so-called synchronous spiral waves) can be excited in an antiferro magnetic field (above). The magnetic waves of neighboring domains are interconnected at the ultrafast time scale through the domain walls (below).
Photo credit: David Bosini
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