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Video of a phenomenon: Standing waves that won't stand still
And yet they move: An international team of scientists involving physicists from the Center for Nanointegration (CENIDE) at the University of Duisburg-Essen (UDE) has observed a new phenomenon: They have generated standing waves – which travel. The results of their research have been published in the scientific journal "Physical Review B", including videos.
A wave consists of antinodes and nodes. If you imagine this on a rope, the antinodes are the areas which swing up and down, whereas nodes are the points in between. With a standing wave, nodes and antinodes always remain at the same position and do not move along the rope.
In travelling waves on the other hand, nodes and antinodes do not remain in place: If you start shaking a rope from one end, you will excite a wave that travels down the rope until it reaches the other end.
Benjamin Zingsem from the research group of UDE's Professor Michael Farle has now observed the apparent paradox for the first time: For this purpose, he worked with, what physicists call a chiral magnet:
A magnetic material in which the so called Dzyaloshinskii-Moriya interaction occurs. In such magnets, all dipoles – the tiny magnets that make up the solid – are slightly tilted towards each other with a certain direction, like screw windings.
If the system is resonantly excited, a standing wave with travelling properties is formed. This wave has stationary nodes and antinodes, but at the same time a continuous phase shift creates the impression of a travelling wave. "I had to look at it for a long time before I could put it into words. I only really understood it by watching a video of the phenomenon," says Zingsem.
The effect reveals previously unknown transport properties in such systems. Which may, for example, be harnessed in future technology, as, information can be stored, transmitted and processed via magnetic oscillations without generating heat, which is the main bottleneck in conventional electronics.
(Score: 5, Informative) by inertnet on Tuesday August 13 2019, @09:58PM (2 children)
Apparently this [uni-due.de] is the video.
More information here [idw-online.de].
(Score: 0) by Anonymous Coward on Tuesday August 13 2019, @11:28PM
It's an animation, not a real video... by that standard, I could use Blender to "prove" that dark matter exists.
(Score: 3, Informative) by Runaway1956 on Wednesday August 14 2019, @12:20AM
Yes, that was helpful. The video linked to won't play anywhere for me. I picked the least locked down browser, and told it to allow all scripts and everything - still wouldn't play for me. Your link works!
Now this is where I brag on Honda, and it's standing wave exhaust system? The GL500 and CX500 twins have twin exhaust, with a connector between them. Even if you remove the mufflers, the engine is quieter than you expect, because the sound pressure waves tend to cancel each other out in a standing wave. That is late 1970's technology.
Yeah, I know, car analogies are more acceptable than motorcycle analogies, but you gotta work with what you got!!