The Barkhausen Effect Lets You Hear Magnetic Domains

[@Tom5TomEntertainment]

The Barkhausen effect had a lot less to do with dogs than I thought

[@rudolphclaus9565]

....😂

[@lightspeed-mecharena5929]

Bærk

[@oggy107]

lmao

[@todaywefly4370]

Class clown. 😏

[@neumanngregor]

Good one

[@AJtheAnomaly]

I can’t believe I’m hearing atomic structures move that’s fuckin awesome

[@BlueX_E_N_O9]

lol xD

[@Alvin-1138]

It also shows how our perception of 'solid' matter is an illusion.

[@Alvin-1138]

@*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? 🙂

[@otinane89]

@@Alvin-1138 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.

[@AndreasDelleske]

@@Alvin-1138 I would rather say the word "illusion" needs a lot of context :)

[@bluefoxf5963]

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...

[@antonk.653]

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).

[@TheMlg556]

@@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

[@PlayNowWorkLater]

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!

[@t.n.t1229]

@@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.

[@Regularsshorts]

You are best science teacher I could ever get.

[@HANNYAFACE]

And neil Tyson

[@Regularsshorts]

Yeah and veritasium?

[@Regularsshorts]

Arvin ash?

[@Regularsshorts]

😁

[@jayneshpatel7925]

I watch all of them 😀

[@themonkeyman2547]

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

[@thestraynetwork]

Awesome

[@zipityzap7675]

So that’s how they made the Minecraft sand sound.

[@ivander1511]

@I care Don't care, didn't ask

[@bhuvaneshwaranm5798]

@@user-kc1oy4hq9u don't just report the comment report the channel too. He's spamming all over.

[@droidksn6372]

Ok reported this video and channel for spamming.

[@zipityzap7675]

@@droidksn6372 @I care is a bot .

[@coolbionicle]

I love how it sounds like shifting sand around. It really demonstrates the particulated nature of magnetic domains.

[@androidphone1901]

Exactly!

[@Vitotcher]

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

[@xDR1TeK]

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.

[@netx421]

You're leaving out the transistor sir.

[@xDR1TeK]

@@netx421 indeed. First solid state device was a stone with pin wire touching it.

[@netx421]

@@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.

[@beactivebehappy9894]

@@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

[@xDR1TeK]

@@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. 😜

[@DefianceGJ]

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😂

[@1GLO919]

what video was that?

[@drderpphd]

@@1GLO919 I think this one ... kzbin.info/www/bejne/faGommCgiNKWpaM

[@1GLO919]

@@drderpphd thanks man

[@IIswagdelicious]

I guarantee when it was time for science projects to be presented in his class, everyone looked forward to him presenting

[@slesinski57]

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.

[@thomashan4963]

I love how you are teaching the basic of electromagnetism in the most simplest way. ❤️

[@skougi]

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 KZbin needed. bravo, encore!

[@rgbii2]

Enjoyed the video. The magnet in the cup was a great way to visualize the small magnets in metal!

[@StresstechGroup]

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.

[@willcollins9470]

I've been in electronics a long time and i keep seeing stuff here I've never seen before. thank you.

[@dandeeteeyem2170]

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 KZbin had been around when I was in school 🙂

[@fmdj]

That was a particularly good one, love how you managed to demonstrate invisible microscopic things with just household items

[@RADCreativeArt]

This would be extremely interesting to the paranormal investigators. I always questioned the white noise boxes.

[@AmaroqStarwind]

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.

[@RADCreativeArt]

@@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 KZbin 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.

[@pexfmezccle]

@@AmaroqStarwind it's all the same photons though

[@pexfmezccle]

@@RADCreativeArt overactive imagination

[@AmaroqStarwind]

@@pexfmezccle 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.

[@Rutetid]

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

[@WouterVerbruggen]

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.

[@hashbrown777]

Yeah, I would've much preferred his control being another winding around a wood stick or something, not just disconnecting the circuit entirely

[@TheRealDefacto]

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.

[@WouterVerbruggen]

@@TheRealDefacto Read the second sentence of my comment and you'll see that I explain exactly why you don't hear that.

[@TheRealDefacto]

Wasn’t replying to you dude, I just replied to hashbrown’s comment.

[@WouterVerbruggen]

@@TheRealDefacto my bad, there was no "@xxx" so that implies it was a response to the main thread.

[@Ash-ft5su]

At this point I think you’re responsible for about half of my education.

[@thoreberlin]

This is one of the best ferromagnetism classes out there! Wish i had had this, when when i started at the university.

[@antonk.653]

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.

[@wulfseig1864]

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.

[@alifetomake]

Interesting! Now, could you tell me why some of my tools become magnetic with time? Is this related to this effect?

[@ronaldkristijanto3796]

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.

[@rllysaltsmybananas]

But it won’t last, iron is not a permanent magnet; steel is.

[@ronaldkristijanto3796]

I said "tool" instead of iron earlier and I edited it because it can mean something else LOL ...

[@prakharmishra3000]

@@ronaldkristijanto3796 XD

[@ther701]

Maybe due to Earth's magnetic field. It might be inducing little permanent magnet property.

[@Kennedy-id8fg]

this is so incredible you explain cool complicated things so diligently!!

[@petergoestohollywood382]

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!

[@alyn7d7]

Action lab is my #1 favorite channel to watch on KZbin.

[@AiAiTheMonkey]

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!

[@gianbaumann7131]

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

[@yello171]

Holy shit! I thought I couldn't understand Ferromagnetism better than I already do. But this demonstration, it's just something else.

[@JakeHarris0]

Maybe your best short. Great explanation!!!

[@RandyKing314]

Cool demo! Also, thanks for the part with the magnet in the cup

[@emmanueloverrated]

That was truly a very interesting video James. Thank you very much.

[@yerranitesh3721]

Literally, I wrote magnetism and materials for sensors Exam today morning. Now I see this video and you said everything I studied. ✌️✌️

[@TheGeenat]

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.

[@SomebodysNephew]

Man. I somehow missed this one. Good video. Appreciate the updates .

[@nerdexproject]

I love how you come up with all these fascinating experiments!

[@michaelmoran2059]

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!

[@yadhu4379]

You are great sir. Truelly waiting for your next video.. Love from India

[@srishailspujar6278]

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....

[@Roust7]

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

[@ganko2240]

Amazing, I had always wondered about domains and this just nails it!

[@AstarOfDavid]

Wouldn't the sound heard simply be the electricity being generated? Like when the polarity of the one side of the magnet comes close to the iron bar - the elections of the iron are pulled in one direction to align. As the electrons in the iron shift/flip polarity towards the magnet - each flip causes a short spike in electricity - this is the "clicks" of static heard. This is the 1st flow/pulse of electricity. Once the magnet is flipped it causes the reversal of the electrons in the opposite direction & static is heard once more. This is the 2nd flow/pulse of electricity.

[@AstarOfDavid]

You might like to watch this short documentary on the History of radio: kzbin.info/www/bejne/aKPSeGegfs-pe80

[@ProjectPhysX]

Wow this is so cool! I didn't know about the Barkhausen effect before. I always learn something on this channel :)

[@forstudypurpose8380]

Here what you are finding 8:01

[@OnTheRiver66]

I always learn something from your videos. I thought I knew all non destructive tests for metals but did not know about this one.

[@GamesTutorials_]

I love each of your experiments, I always learn with each of them. Thanks.

[@BlueX_E_N_O9]

Could you magnify the suns light on the electroscope to see if it has enough energy to strip of electrons

[@acockatiel3577]

@I care no

[@lightspeed-mecharena5929]

I want to see it

[@BlueX_E_N_O9]

@Dreadlord yup, me to

[@Bindu369]

Wow amazing 😯💫I think action lab is best sci-fi channel ever see 😯👑

[@KilledKenny01]

Congratz. You invented a single coil for a E-guitar. Let’s rock

[@yaksheenkumar6270]

You are the best teacher I have ever learn from

[@JerryDoanut]

You need for views you are under rated

[@oladosvinzuella6998]

this is the most interesting episode of the action lab I have ever watched wooooooooooooow thank you so much

[@comradepeter87]

How do you know it's not from the induced current of neodymium magnet? EDIT: Should've waited till 8:38

[@AbsoluteAbsurd]

Lol

[@TheRealDefacto]

Lol same here

[@GhostinTube]

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

[@luked3172]

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.

[@vinitapandey7267]

Cool man!!! Understood the concept of electromagnetic induction in a different and creative way..👍👍😄

[@aaronrappleyea8202]

Dang, the way he visualized this, opened another path in my mind

[@202Electrics]

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.

[@maniacmemes5746]

Thanks for the information

[@BlazinLow305]

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.

[@whatitis5646]

@@BlazinLow305 you can get a special capacitor bank to “clean” the power and use xlr cables to protect high gain audio from interference

[@dwdadevil]

That demonstration also explains why condenser microphones are better than traditional microphones, of course the noise is extremely quiet but still noticeable

[@yuribr84]

You have a coil in a changing magnetic flux. What your amplifier is perceiving is the generated electric field from the coil, aka voltage.

[@Nyocurio]

Why then does he have to flip the magnet for the effect to continue?

[@beactivebehappy9894]

7:20 the asmr we never needed but god are we happy with that!!!

[@westonding8953]

Wrapping that up was a genius illustration of magnetic domains!

[@matthewperlman3356]

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.

[@nanaki-seto]

Isn't this also related to how am radio works? Radio waves induce a changing magnetic field in the am antenna which the electronics then convert to sound

[@YSPACElabs]

No, the antenna picks up radio waves (light at very low frequencies) and because of the photoelectric effect, this causes electrons to move around. That signal is then amplified and demodulated (or demodulated and amplified by electronics. I am pretty sure that this is correct.

[@olmostgudinaf8100]

Yes, it is Only the magnetic field flips orientation hundreds of times a second. Domains in a regular iron bar would not be able to react so quickly, so a special material is used. But tbe principle is the zame.

[@whatitis5646]

Depends, a radio can really off the induced magnetic field using a ferrite core antenna or a the electromagnetic waves with an iron antenna

[@jesscorbin5981]

No, yes, depends😂🙂

[@FAB1150]

If I understand antennas well they react to electric fields and not magnetic fields

[@ShomeAvi]

Respect comes naturally for you sir.

[@arijitdey8316]

That coil induced current must be acting as an antenna to pick white noise, however the defects are directly related to the amplitude of the noise amplitude

[@pbp6741]

Excellent demonstrations.

[@jaymorris3468]

The excitement and white knuckle drama kept me tense and my teeth grinded together, you won't be disappointed, TRUST ME! 😁

[@AmitSingh-sf5qp]

I always touch if notification comes for your new video upload . I never miss it's EPIC no..

[@douglasstrother6584]

The Barkhausen Effect is mentioned in Vol. II, Ch. 37 titled, "Magnetic Materials" of "The Feynman Lectures".

[@weylin6]

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

[@6alecapristrudel]

If you have an electric guitar you can try this out with no effort :) The pickups are both the magnet and the coil, just wiggle around a piece of iron around them. May need to crank the volume up a bit though.

[@NCC1701-E]

Forged in Fire judge: let me check your metal with this setup before I smash it on this deer antler

[@forever-kq6mf]

Man u are awesome!keep spreading education ❤️😀👍

[@helloitsnicko]

As a musician I should probably know the answer to this but isn't that the basic stuff behind how guitar pickups work? Really cool!

[@Reliquancy]

Barkhausen sounds like what they might call a dog pound in Germany.

[@eeriklilles9323]

Great demonstration

[@JerryMlinarevic]

Excellent demo.

[@Regularsshorts]

In my next video I will try to change the direction of entropy so stay tuned for more........

[@55Ramius]

I did this back in 1970 with a telephone pickup coil and a little reel-to-reel tape recorder as a amp. Worked really well. Of course, I did not know what it was really back then.

[@onkarjadhav8066]

Finally! someone who calls neodymium as neodymium and not neodium

[@marwansallouta2101]

Amazing experiment, Thank you.

[@eelcohoogendoorn8044]

I love simple physics experiments like this, especially ones that I had never heard of before.

[@JayElectroTech]

Best and simplest Example. 👏👏👏👌

[@omsingharjit]

2:54 as i was thinking you did this analogy using lots of tiny mag balls

[@real-webbe]

Fascinating - great video!

[@sagnikmaity1444]

When you move the magnet towards the coil, it detects a change in magnetic flux of the permanent magnet as the magnetic fieldlines are inducing current to the coil and it gets amplified by the guitar amplifier.

[@TysonJensen]

Love the auto captioning “bark housing effect.”

[@justablank1184]

You are always cool! I have learnt so much already!

[@xj9779]

i got questions ... 1.okay does this effect the coil only withot the iron bar ? 2. A possible experiment to show the different defects ...grab a metall file break it in half (ideally with an angle grinder to create a breaking point). Leave one half as it is and give the other half a heat tratment by heating it up to nonmagnetic (above 769°C) and let it cool down slowly (a bucket of perlite or wood ash works pretty fine) then wrap the coil arround both and check is there a measurbable diffrence. There should be one. Hardened steel has carbon atoms trapped in the crystal lattice, so a difference should be measurable because inner tensions. Maybee use some stainless steel bar or other metalls like aluminum, copper,cobalt, nickel to show us a comparsion between them

[@bill392]

I wonder if, instead of wrapping the wire coil around the metal bar, you could use a typical multimeter current clamp, which is a two-piece ferrite core that goes around the metal or conductor and has its own internal the wire wrapped around a section of the ferrite and an internal amplifier to output a voltage that can be viewed on a scope or amplified to make the sound.

[@spiderdude2099]

I’m pretty sure, this also has to do with how superconductors work. Get the right substance to a low enough temperature and the domains will line up. I could be wrong, I’m just theorizing but I feel like there’s a connection there.

[@Giggiox-hr9kq]

Even if I think that the fact that the noise is produced only if you switch the magnet proves (or at least it's a prove) that the noise is made by the switching domains, I think you should have tried to move the magnet near the coil of wire without the stick of iron in order to prove that the noise was not produced by the current generated by the change of magnetic field. By the way, it is a great video and I apologise if there are some mistakes in my message, I'm not an English speaker.

[@Ing_Failure]

-what are you doing? -listening magnets... -w h a t ?

[@omsingharjit]

It's pretty interesting when you are testing it

[@lifesoldier]

someone needs to make an album with this