Physicists generate new nanoscale spin waves

Physicists generate new nanoscale spin waves
Illustration of the experiment. Credit: Dreyer et al, Nature Communications (CC-BY-SA 4.0)

Strong alternating magnetic fields can be used to generate a new type of spin wave that was previously just theoretically predicted. This was achieved for the first time by a team of physicists from Martin Luther University Halle-Wittenberg (MLU). They report on their work in Nature Communications and provide the first microscopic images of these spin waves.

The basic idea of spintronics is to use a special property of electrons—spin—for various electronic applications such as data and . The spin is the intrinsic angular momentum of electrons that produces a magnetic moment. Coupling these magnetic moments creates the magnetism that could ultimately be used in . When these coupled are locally excited by a pulse, this dynamic can spread like waves throughout the material. These are referred to as spin waves or magnons.

A special type of those waves is at the heart of the work of the physicists from Halle. Normally, the non-linear excitation of magnons produces integers of the output frequency—1,000 megahertz becomes 2,000 or 3,000, for example.

"So far, it was only theoretically predicted that non-linear processes can generate spin waves at higher half-integer multiples of the excitation frequency," explains Professor Georg Woltersdorf from the Institute of Physics at MLU. The team has now been able to show experimentally which conditions are needed in order to generate these waves and to control their phase. Phase is the state of the oscillation of a wave at a certain point and time. "We are the first to to confirm these excitations in experiments and have even been able to map them," says Woltersdorf.

According to the physicist, the waves can be generated in two stable states which means this discovery could potentially be used in data processing applications, since computers, for example, also use a binary system.


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Spintronics: How an atom-thin insulator helps transport spins

More information: Rouven Dreyer et al, Imaging and phase-locking of non-linear spin waves, Nature Communications (2022). DOI: 10.1038/s41467-022-32224-0
Journal information: Nature Communications

Provided by Martin-Luther-Universität Halle-Wittenberg
Citation: Physicists generate new nanoscale spin waves (2022, September 15) retrieved 26 September 2022 from https://phys.org/news/2022-09-physicists-nanoscale.html
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