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

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

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...

You are best science teacher I could ever get.

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

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

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

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😂

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

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.

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

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

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

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 KZfaq 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

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

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

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

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

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

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.

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

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

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

Maybe your best short. Great explanation!!!

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

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

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.

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

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 KZfaq had been around when I was in school 🙂

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.

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

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

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

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

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.

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

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!

Fascinating - great video!

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

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!

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!

Amazing experiment, Thank you.

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

You are the best teacher I have ever learn from

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

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

Wrapping that up was a genius illustration of magnetic domains!

Excellent demonstrations.

I did not know that. Thanks mate!

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

Best and simplest Example. 👏👏👏👌

Man u are awesome!keep spreading education ❤️😀👍

Excellent demo.

So well explained!

I'm subbed to this channel but don't always watch every vid. This video however had me fascinated. 👍💙

That was an excellent explanation

Great demonstration

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?

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

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 amazing to contemplate.

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

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

Respect comes naturally for you sir.

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

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.

I am very excited to know about what black energy means. I hope u will make a video on that. Thank you 😊

Breaks my brain 🧠 lol Sort of makes it look as though even some of the hardest objects are still fluids / fluid like. Always moving

Super cool, Thank you :)

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

Pretty cool explanation

This is how an electric guitar pickup works!

Amazing experiment

That’s really cool how you can use the technique to test for metal defects.

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

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

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.

Wow! That's really cool!

It's pretty interesting when you are testing it

This explains so much

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

Very scientific :D Imma try it that's why I followed you :D

Extremely amazing 😳

Churning up the ether. Love it.

Amazing 🔥

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

You are awesome man

someone needs to make an album with this

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.

Love that Barkhausen!

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

This is crazy. Very cool.

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

Thats actually amazing.. and to think that all of this stuff exists.. including us.. its just overall unbelievable.. i love the universe.

You are a genius!

Dude! Your are very right