The Barkhausen Effect Lets You Hear Magnetic Domains
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- เผยแพร่เมื่อ 19 มิ.ย. 2024
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I show you the Bakrkhausen effect in which you can hear magnetic domains shifting inside metal.
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The Barkhausen effect had a lot less to do with dogs than I thought
....😂
I guess the algorhytm listened bark and started showin pedigree ads here
Not even kiddin i relly got a pedigree ad
Bærk
lmao
Class clown. 😏
I can’t believe I’m hearing atomic structures move that’s fuckin awesome
lol
xD
It also shows how our perception of 'solid' matter is an illusion.
@*S U C T I O N* Ok.
The video of the particles implied some physical "movement". I mistook the changes in the material for movement.
However there are other observations and methods that validate my comment about 'solid' objects, correct? 🙂
@@Alvan81 The fact that the magnetic domain switches polarity doesn't prove that the material is not solid, or that our understanding of what is solid, is false. It just proves that solid materials and generally matter, can have properties that we don't know or easily understand, a good example is quantum spin, that is the way matter interacts with electromagnetism.
Don't forget that most materials do not have magnetic domains.
@@Alvan81 I would rather say the word "illusion" needs a lot of context :)
You are best science teacher I could ever get.
And neil Tyson
Yeah and veritasium?
Arvin ash?
😁
I watch all of them 😀
8:28 - the most important part of video, this show that sound comes from switching domains NOT from magnet flying around the coil ( thus it also generate changeable magnetic flux which generate small current). It means that flux change rate is the greatest when domains are switching inside iron bar...
I would dispute (or prove) that actually. I would make a test with just the coils without the Iron bar inside, and subtract that noise from the experiment. The result would be mostly the same, but it would also shut up all the smartasses talking about magnetic induction (me included).
@@antonk.653 yeaah I agree, there must be a significant amount of induced current with that number of loops and a bigass strong magnet moving around
Another to totally agree. At first I wasn’t convinced, it seemed like you were just creating electrical current as the magnet waved across the coiled wire, but as soon as you showed the part about approaching the end with one pole, then repeating it with no noise, and then flipping it and the noise returned. Super cool experiment!
@@antonk.653 i don't think we can easily subtract that noise, because the coil with and without iron bar have different inductive reactance, it means the noise from the inductive current of the coil with iron bar still different from the noise without iron bar we can't just subtract it.
So that’s how they made the Minecraft sand sound.
@I care Don't care, didn't ask
@@user-kc1oy4hq9u don't just report the comment report the channel too. He's spamming all over.
Ok reported this video and channel for spamming.
@@droidksn6372 @I care is a bot .
There's industrial test machines based on this phenomenon. The can determine grain size and density of steel, and thereby infer the grade and hardness. We used them in an auto plant to check gears for proper heat treat and composition without running a destructive hardness test
Awesome
Theory and implementation are always funny. Science goes head over heels to prove things mathematically, implementation is just copper wire wound up on an iron core and voila.
You're leaving out the transistor sir.
@@netx421 indeed. First solid state device was a stone with pin wire touching it.
@@xDR1TeK yes, germanium (edit: Galena). The coil is an inductor, when the magnetic field changes in the rod at the core another magnetic field is generated and opposes it in the coil, this in turn creates a potential used to trigger the transistor in the amplifier, generating a static click.
@@xDR1TeK like that we can generalize every metal to trivial things. Like you been say the atom bombs were made from green white stones found in rocks.
For most of the current advancements, the things were actually known fundamentally before they were discovered to be known. You can actually find many elements missing from the first periodic table which were predicted to be there.
Voila they were later discovered to exist!! Having said that I agree to you you but still it took a lot of observation and study to go past simple concepts like metals and rocks
@@beactivebehappy9894 at least theory had to come after observation, and then the theory would assist to fill in the blanks. Still, the implementation is far simpler than theory, at least if you allow a margin for error. This is something I experience a lot while designing Circuits. there are times, theory prevails like when you design antennas. if you try to wing it all day long without pencil and paper, the antenna still won't work. Voila is defeated. 😜
Anything with magnets always intrigued me! My favorite is showing magnetic field lines with that dish and light setup you had! I showed my little sister that and now she’s looking at magnetic fields of everything😂
what video was that?
@@1GLO919 I think this one ...
th-cam.com/video/GpEi-jSmcoA/w-d-xo.html
@@drderpphd thanks man
I guarantee when it was time for science projects to be presented in his class, everyone looked forward to him presenting
I love how it sounds like shifting sand around. It really demonstrates the particulated nature of magnetic domains.
Exactly!
At this point I think you’re responsible for about half of my education.
In 9 minutes I actually learned about this topic more and understood it better than back in the university, where we would spend 2 hours listening to a boring lecture and end up not understanding anything about the magnetic domains
This is one of the reasons I love The Action Lab so much, I wish schools had such visual and demonstrative lectures like videos on this channel
This would be extremely interesting to the paranormal investigators. I always questioned the white noise boxes.
That implies that the ghosts are electromagnetic.
You ever notice how ghosts appear on film-based photography, but not as easily on analog video, and not at all on digital cameras? I think part of that comes down to electromagnetic interference and the physical properties of light.
@@AmaroqStarwind I’ve been investigating for about 15 years and it’s always a surprise to see what is caught on camera and audio. My first TH-cam video clips was one of them. I have it posted up on my channel. My daughter passed away suddenly in May and she came to me to tell me to keep going. She even knocks into the camera I was filming with.
@@AmaroqStarwind it's all the same photons though
@@RADCreativeArt overactive imagination
@@tronalddump2267 Electronics and film record light differently. The electronic sensors in a video camera or a digital image sensor only respond to certain wavelengths of light, and just turn a pixel on or off based on how intense that light is.
Film reacts differently to light because it's an actual physical medium. Technology Connections has a video about it if you're curious.
Always enjoy this channel’s content. Thank you for posting, and all of the work (behind the scenes) we can’t watch. Also, these vids that aren’t rehashing all the usual “science” topics are one hell of a breath of fresh air I didn’t know TH-cam needed. bravo, encore!
I love how you are teaching the basic of electromagnetism in the most simplest way. ❤️
Dude it feels really good when you can relate the things what you studied at school with this and it all sums up , live your videos
This is fantastic. I am definitely going to show this demo to my AP physics c students. So cool. Thanks for making me a better teacher.
That was a particularly good one, love how you managed to demonstrate invisible microscopic things with just household items
Enjoyed the video. The magnet in the cup was a great way to visualize the small magnets in metal!
I've been in electronics a long time and i keep seeing stuff here I've never seen before. thank you.
this is so incredible you explain cool complicated things so diligently!!
I love how you come up with all these fascinating experiments!
That was truly a very interesting video James. Thank you very much.
Man. I somehow missed this one. Good video. Appreciate the updates .
Maybe your best short. Great explanation!!!
The overall flux change when moving the magnet closer to the solenoid will also induce a signal. This however is of much lower frequency and therefore either not audible, or a bass-like hum you won't notice. In applications of this technique, it is easily filtered out.
Yeah, I would've much preferred his control being another winding around a wood stick or something, not just disconnecting the circuit entirely
He actually does the control by bringing same pole of the magnet again and again and there is no noticeable noise. So induction ain’t it.
@@TheRealDefacto Read the second sentence of my comment and you'll see that I explain exactly why you don't hear that.
Wasn’t replying to you dude, I just replied to hashbrown’s comment.
@@TheRealDefacto my bad, there was no "@xxx" so that implies it was a response to the main thread.
hey man i love your videos so mutch cuz its like knowledge i will probably never use but its also sooo entertaining. you 100% got me on every of your videos
Cool demo! Also, thanks for the part with the magnet in the cup
Interesting! Now, could you tell me why some of my tools become magnetic with time? Is this related to this effect?
If you "rub" a piece of non magnetic iron with a magnet (with one pole one direction) it will "straighten" those small magnetic domains and the iron will become magnetic.
But it won’t last, iron is not a permanent magnet; steel is.
I said "tool" instead of iron earlier and I edited it because it can mean something else LOL ...
@@ronaldkristijanto3796 XD
Maybe due to Earth's magnetic field. It might be inducing little permanent magnet property.
Cool demonstration! We actually manufacture quality test equipment for ferromagnetic parts based on this phenomenon. Instead of bar magnets we use AC magnetic field to sinusoidally excite the domains. The Barkhausen noise is then read-out with a pick-up. Based on the signal amplitude one can measure the hardness of the sample without destroying it.
I love each of your experiments, I always learn with each of them. Thanks.
Seriously dude, your videos explain so many fundamental concepts in science better than anyone else out there. They need to show your videos in schools as a teaching aid! I wish TH-cam had been around when I was in school 🙂
Amazing, I had always wondered about domains and this just nails it!
The demonstration with the plastic cup blew my mind. That is neat for nerdy funfacts during parties, but also extremely helpful for actual physics classes.
Fascinating - great video!
This is one of the best ferromagnetism classes out there! Wish i had had this, when when i started at the university.
How do you know it's not from the induced current of neodymium magnet?
EDIT: Should've waited till 8:38
Lol
Lol same here
You are always cool! I have learnt so much already!
I had the best Science teacher in school and you remind me of him. Science class was my favorite. With your channel it still is my favorite.
Amazing experiment, Thank you.
Wow this is so cool! I didn't know about the Barkhausen effect before. I always learn something on this channel :)
Excellent demonstrations.
Your videos never cease to amaze me! Ridiculously brilliant content! How you make it easy to understand is beyond me but you do it brilliantly!! Top Content sir! Keep it up!
Cool man!!!
Understood the concept of electromagnetic induction in a different and creative way..👍👍😄
Action lab is my #1 favorite channel to watch on TH-cam.
Excellent demo.
The research group I'm in actually works on a model that describes this behavior. The behavior is known as "well-organized criticality" and we describe it with a model called "avalanche slip statistics theory." This model actually applies to a ton of things such as earthquakes, ferromagnetic switching (Barkhausen noise), and even examples of stellar variability (what I work on). It's really cool stuff!
Holy shit! I thought I couldn't understand Ferromagnetism better than I already do. But this demonstration, it's just something else.
I always learn something from your videos. I thought I knew all non destructive tests for metals but did not know about this one.
I did not know that. Thanks mate!
this is the most interesting episode of the action lab I have ever watched wooooooooooooow thank you so much
You are great sir. Truelly waiting for your next video.. Love from India
I’m still mind boggled from when I first learned about how in solid metal depending on temperature the crystal structure changes entirely ... and apparently even magnetic domains. Awesome experiment, gonna recreate it with my amp now haha. Thank you for being awesome!
Great demonstration
Man u are awesome!keep spreading education ❤️😀👍
My favorite part was when you showed that you need to change the polarity of the magnet 🧲 to continue creating the white noise once the piece of iron was magnetically oriented. That was awesome.
This is how an electric guitar pickup works!
That was an excellent explanation
Super cool, Thank you :)
You are the best teacher I have ever learn from
Best and simplest Example. 👏👏👏👌
Wow amazing 😯💫I think action lab is best sci-fi channel ever see 😯👑
So well explained!
I always touch if notification comes for your new video upload . I never miss it's EPIC no..
Hi! Great video. I really enjoyed watching it and also gained valuable knowledge related to BN.
Can you do one on magnetoacoustic emission as well?
Wrapping that up was a genius illustration of magnetic domains!
I'm subbed to this channel but don't always watch every vid. This video however had me fascinated. 👍💙
Dang, the way he visualized this, opened another path in my mind
I love simple physics experiments like this, especially ones that I had never heard of before.
Literally, I wrote magnetism and materials for sensors Exam today morning. Now I see this video and you said everything I studied. ✌️✌️
Wow! That's really cool!
-what are you doing?
-listening magnets...
-w h a t ?
Its a scary coincidence that I just wrote my uni exam about domains in ferromagnetic materials today and you post a video on the same topic
I am very excited to know about what black energy means.
I hope u will make a video on that.
Thank you 😊
It's
pretty interesting when you are testing it
Amazing experiment
I found this effect many years ago, but I did not know the correct cause; at the time I had thought that it's was just the amp reacting badly to the generated DC voltage which was likely above it's designed input range. Thanks for explaining the real reason for this.
Pretty cool explanation
This is amazing to contemplate.
Part of your demonstration waving magnet near your coil also induced alternative current in the coil and the noise you hear on your amp. You have separate the movement of your magnet causing current in the coil
This explains so much
That’s really cool how you can use the technique to test for metal defects.
Respect comes naturally for you sir.
someone needs to make an album with this
with the wire around that rod you can "hear" electronics do their job as well if you keep the rod close to your phone, computer or anything with microchips.
EMF is kinda interesting.
Thanks for the information
It's not interesting when I'm trying to play high gain tones through my guitar amp, lol. Power can also apparently be "dirty" as well which is why my guitars are so noisy in this new house.
@@BlazinLow305 you can get a special capacitor bank to “clean” the power and use xlr cables to protect high gain audio from interference
This is crazy. Very cool.
Breaks my brain 🧠 lol
Sort of makes it look as though even some of the hardest objects are still fluids / fluid like. Always moving
I want to be a scientist
Comment who who want to be scientist like him.??
The excitement and white knuckle drama kept me tense and my teeth grinded together, you won't be disappointed, TRUST ME! 😁
Very scientific :D Imma try it that's why I followed you :D
I tried to explain this to my little 10 year old brother im not sure if he ever understood about the domains of little magnet inside a bar, but I'm sure he is gonna understand about this today.......the idea of using a cup with a small magnet is so brilliant....
Barkhausen sounds like what they might call a dog pound in Germany.
You should also try pointing an IR remote controller with a button pressed at the coil and you will hear it pulsate. It works at least with an actual guitar pick-up, and what you've made here looks like a larger version of that.
You have a coil in a changing magnetic flux. What your amplifier is perceiving is the generated electric field from the coil, aka voltage.
Why then does he have to flip the magnet for the effect to continue?
7:20 the asmr we never needed but god are we happy with that!!!
Love that Barkhausen!
Love the auto captioning “bark housing effect.”
Very good video. I like it.
As a luthier that winds my own pickups I finally understand what I’m doing
I noticed this years ago when dabbling with magnets and an amplifier circuit, but I couldn't figure out why, I just thought it was a poor connection getting ever-so-slightly scraped along by the magnet pulling on it.
Also found out that a reverse-biased transistor makes a constant white noise through an amplifier, might be interesting to do a video on that, I think it's avalanche breakdown or something? It was really useful for sound design since you could modulate it to make percussive sound effects or jet engines or something, but now days we have free software for that