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Scientists discovers new properties of magnetism that could change our computers

Date:
May 11, 2022
Source:
University of Copenhagen - Faculty of Science
Summary:
A fundamental property of magnetism has been disclosed through new research. The discovery may be key to development of a new generation of powerful computers.
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Our electronics can no longer shrink and are on the verge of overheating. But in a new discovery from the University of Copenhagen, researchers have uncovered a fundamental property of magnetism, which may become relevant for the development of a new generation of more powerful and less hot computers.

The ongoing miniaturization of components for computers which have electrons as their vehicles for information transfer has become challenged. Instead, it could be possible to use magnetism and thereby keep up the development of both cheaper and more powerful computers. This is one of the perspectives as scientists from the Niels Bohr Institute (NBI), University of Copenhagen, today publish a new discovery in the journal Nature Communications.

"The function of a computer involves sending electric current through a microchip. While the amount is tiny, the current will not only transport information but also contribute to heating up the chip. When you have a huge number of components tightly packed, the heat becomes a problem. This is one of the reasons why we have reached the limit for how much you can shrink the components. A computer based on magnetism would avoid the problem of overheating," says Professor Kim Lefmann, Condensed Matter Physics, NBI.

"Our discovery is not a direct recipe for making a computer based on magnetism. Rather we have disclosed a fundamental magnetic property which you need to control, if you want to design a such computer."

Quantum mechanics halt acceleration

To grasp the discovery, one needs to know that magnetic materials are not necessarily uniformly oriented. In other words, areas with magnetic north and south poles may exist side by side. These areas are termed domains, and the border between a north and south pole domain is the domain wall. While the domain wall is not a physical object it nevertheless has several particle-like properties. Thereby, it is an example of what physicists refer to as quasi-particles, meaning virtual phenomena which resemble particles.

"It is well established that one can move the position of the domain wall by applying a magnetic field. Initially, the wall will react similarly to a physical object which is subjected to gravity and accelerates until it impacts the surface below. However, other laws apply to the quantum world," Kim Lefmann explains.

"At the quantum level, particles are not only objects they are also waves. This applies to a quasi-particle such as a domain wall as well. The wave properties imply that the acceleration is slowed down as the wall interacts with atoms in the surroundings. Soon, the acceleration will stop totally, and the position of the wall will start to oscillate."

Swizz hypothesis provided inspiration

A similar phenomenon is seen for electrons. Here, it is known as Bloch oscillations named after the American-Swizz physicist and Nobel laureate Felix Bloch who discovered it in 1929. In 1996 Swiss theoretical physicists suggested that a parallel to Bloch oscillations could possibly exist in magnetism. Now -- a little more than a quarter of a century later -- Kim Lefmann and his colleagues managed to confirm this hypothesis. The research team has studied the movement of domain walls in the magnetic material CoCl2 ∙ 2D2O.

"We have known for a long time, that it would be possible to verify the hypothesis, but we also understood that it would require access to neutron sources. Uniquely, neutrons react to magnetic fields despite not being electrically charged. This makes them ideal for magnetic studies," Kim Lefmann tells.

Boost for research in magnetics

Neutron sources are large-scale scientific instruments. Worldwide, only some twenty facilities exist and competition for beam time is fierce. Therefore, only now has the team managed to get enough data to satisfy the Nature Communications editors.

"We have had beam time at NIST in USA, and ILL in France respectively. Fortunately, the conditions for magnetic research will improve greatly as the ESS (European Spallation Source, ed.) becomes operational in Lund, Sweden. Not just will our chances for beam time become better, since Denmark is a co-owner of the facility. The quality of the results will become roughly 100 times better, because the ESS will be an extremely powerful neutron source," says Kim Lefmann.

To clarify, he emphasizes that even though quantum mechanics is involved, a computer based on magnetism would not be a type of quantum computer:

"In the future, quantum computers are expected to be able to tackle extremely complicated tasks. But even then, we will still need conventional computers for the more ordinary computing. This is where computers based on magnetism might become relevant alternatives as better than current computers."


Story Source:

Materials provided by University of Copenhagen - Faculty of Science. Note: Content may be edited for style and length.


Journal Reference:

  1. Ursula B. Hansen, Olav F. Syljuåsen, Jens Jensen, Turi K. Schäffer, Christopher R. Andersen, Martin Boehm, Jose A. Rodriguez-Rivera, Niels B. Christensen, Kim Lefmann. Magnetic Bloch oscillations and domain wall dynamics in a near-Ising ferromagnetic chain. Nature Communications, 2022; 13 (1) DOI: 10.1038/s41467-022-29854-9

Cite This Page:

University of Copenhagen - Faculty of Science. "Scientists discovers new properties of magnetism that could change our computers." ScienceDaily. ScienceDaily, 11 May 2022. <www.sciencedaily.com/releases/2022/05/220511102810.htm>.
University of Copenhagen - Faculty of Science. (2022, May 11). Scientists discovers new properties of magnetism that could change our computers. ScienceDaily. Retrieved June 22, 2024 from www.sciencedaily.com/releases/2022/05/220511102810.htm
University of Copenhagen - Faculty of Science. "Scientists discovers new properties of magnetism that could change our computers." ScienceDaily. www.sciencedaily.com/releases/2022/05/220511102810.htm (accessed June 22, 2024).

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