Neodymium Definition and 49 Threads

I have few cylindrical neodymium magnets of same diameter and different heights and different magnetic inductions in the geometric center of the magnetic pole surface. Knowing those values of magnetic induction, how can I measure what the induction is at a certain distance from that center? For...

Neodymium is a paramagnetic material, so how do we have a permanent neodymium magnet?

Hello everone, I have recently come across the need of a strong constant magnetic field while being limited in space. The field needs to be unidirectional and up until now was generated by two magnets (12x12x12mm N48). Then I came across Halbach arrays and their potentially stronger magnetic...

So I was wondering how I calculate the magnetic force between two magnets. When we learned about magnets, we only covered magnetic fields and electricity (laplace's law) and how electricity can create a B-Field. But how will two B-fields (or magnets) affect each other? Is there a simple formula...

In attempting to make magnetized neodymium powder, I grinded neodymium magnets into a powderusing a belt sander. However, I found that the magnetic properties of the neodymium had decreased substantially. It would appear that any attempt to grind the magnets into a powder using this method seems...

Me and my friend want to make a strong as possible (made from permanent magnets) homemade metal separator for seeds. We are not good in the physics of such level, so we need consultation. We want to try neodymium magnets for our separator. We learned that magnetic flux density could be reached...

Also does it make a better core for an electromagnet than iron does?

Hi all distinguished members of this forum ! As my first post here I would like to open with a situation I have been struggling with I have attached a simple diagram of my problem I have 2 cylindrial N52 neodymium magnets axially aligned with each other with opposite poles facing each other...

I have a practical question. I want to make a rubber (silicone) hose/plug that is pinched closed by two magnets ( very strong magnets such as ones from a hard drive the Neodymium kind). I want to place then into a coil and when I want the liquid to flow, I want to turn on the coil and have the...

Neodymium-Iron-Boron magnets have a relative magnetic permeability of 1.05. According to the formula: B = μ0 * (H + M) Both the magnetizing field H and the magnetization M contribute to the magnetic field B. The magnetization M has sources and sinks, so therefore it follows from Maxwell's...

Hi everyone! My knowledge of physics is very very basic, so I just found this great forum and I think it would be great to have a feedback from people who know. I am in development of a project that involves a laptop sleeve and some magnets. I've already done my research and found that they...

I am trying to calculate the forces between a simple sphere neodymium magnet on other iron surfaces and magnets. I did a lot of research but still not sure what equation to use or how to apply them. I found the following equations here (https://en.wikipedia.org/wiki/Force_between_magnets) F =...

Can a Neodymium magnet get back it's magnetic properties after being demangnetized? Say that there is a Neodymium magnet(Nd-Fe-B) that has been demagnetized(turned paramagnetic) at a temperature higher than its curie temperature. If I extract the demagnetized Neodymium(Nd) from the...

Hi Experts, I'm doing an experiment of Electromagnetic Induction (producing current by changing magnetic field i.e. by circulating magnetic wheel of N52 Neodymium Magnets around copper coil), but what i found when the speed of wheel is HIGH, the Output Current is LOW (in range of .02...

Is it possible to partly demagnetize neodymium magnets in the flame of a candle? Those magnets are made up of Neodymium, Iron and Borium. They have a Nickel-Copper-Nickel coating. The Curie temperature for Neodymium magnets is 310-400°C. Neodymium (magnetic powder) burns but does the coating...

Hello, this is my first post, i only have what we call an O Level Physics here in the UK, but i have a strong layperson's interest in the subject, so I'm looking forward to picking the brains of the more educated people here. My friend's professor showed him something very interesting, all to...

Hello all, as the title states I'm trying to build an arduino powered chess board. The chess pieces will have magnets on the bottom and each square of the board will be equipped with a reed switch for detecting the presence of the magnetic field produced by the magnet. I recently tried this out...

Hello this is my first time to post. I have an electromagnet powered by a car battery charger set at 12 volts the problem is I can't get the electromagnet to repel the neodymium magnet. I have tried switching around the positive and negative leads of the power supply and switching the side of...

Neodymium magnets have an energy capacity of 512 kJ/m3 or 0,512 MJ / cubic liters. That's equivalent to 0.0085 kWh or 8.5 Wh each 1 dm^3. You could recharge an mp3 player for 34 hours, and then you'd have to throw away your magnet. That's still 468 times less than the capacity of a Lead-acid...

Well, permanent magnets are made of ferromagnetic material. These magnets lose permanent magnetization above the Curie temperature(on heating) and behave as paramagnetic materials. The reason is thermal energy. The magnetic moments lose their initial configuration and no longer remain aligned...

Hello, Just wanted to say I did this today. I could envision it in theory a while. Went ahead and filed it under creative commons. Wondered If any of you "are" aware if this is a pattent somewhere? And maybe shed some light on it. We start with arranging neodymium ball magnets in a diamond...

Can old neodymium magnets be crushed to a powder and re-sintered into new shapes?

Hello all, This is just a question i have... I need to know the frequency (in order to meter it) from an electromagnetic source, and i know that a neodymium magnet will disrupts it. so, i want to know what range the neodymium will disrupt, in order to know what device will need to meter...

Hi, I would like to know if Neodymium Magnets can be used as an electromagnetic magnet. The idea is to get a Neodymium Magnet and add DC voltage to do the Gauss Law. The college project is make a very powerful electromagnet, so I thought adding the most powerfull magnet and the some DC...

An N45 Grade Neodymium Rare Earth magnet has a remnance (Br) of 1320 mT and Coercive force (Hcj) of 923 kA/m. I am a little confused with the units of Coercive Force, how does A/m relate to Gauss/Tesla? Also, if an N45 magnet was placed inside a 2T MRI, would that be strong enough to...

Pretty straight forward. Whats the amount of energy needed to create a neodymium magnet? What's the cost ratio? These magnets are expensive, but is the amount of energy needed to create them very high (2Kw)? Or is it still pretty reasonable? Does anyone have a link with accurate estimations?

Hello all, I am interface designer that occasionally steps out and does some product/concept design. The last one I am working on is something that would require me to make a matrix of little electro magnets, and i am just starting to inform my self about all that. I loved electrical...

Hallo everyone! As you all know one of the strongest rare-earth magnet is Neodymium. I was wondering... under very cooled temperatures their magnetism will last for a longer time as usual and their magnetic field will be stronger than before too! How long do you think it could last? I mean...

Watch this video first, please. ( http://www.youtube.com/watch?v=2ghBUcQG1lQ&feature=related ). I had been imagining magnetism in general as fluid motion and not like it is portrayed now days for the last few years. Disregarding the hundreds of notes and all that, what I did notice was this...

Okay, so I need to make a DC motor for my physics assie and I am aiming to use an electromagnet to magnetise iron sheets shaped into the shape of a radial magnet. Would this even work? O.o Or would neodymium be better for its size? How large would the electromagnet have to be in order to beat...

Which one is stronger given they are the same size and weight? Say 4 oz. Just say you only have 12v to work with on the electromagnet.

Generally, most of the research I have done says that neodymium magnets do not loose their energy, even when dropped or around other magnets, and will last 400 years. But what about if the neodymium magnets are constantly in motion and interacting with each other? Our system has a Sphere...

If a magnetised neodymium ball has a definite north and south point, could you slice the ball in two, and weld 2 "north" halves together, to create an entirely north ball? If this is impossible, how about designing a ball made in, say, a 3D printer, then embed it with small magnetised neodymium...

Hey guys, Im trying to design a electric gear shiftier for a motor bike. Basically I require about 200N of force to change gear with a 10mm throw (in both directions). I would like to use a tube neodymium magnet. (23mm diameter 25mm high with a 5mm hole throw the centre with a N48 grade) What I...

Hey guys, Im trying to design a electric gear shiftier for a motor bike. Basically I require about 200N of force to change gear with a 10mm throw (in both directions). I would like to use a tube neodymium magnet. (23mm diameter 25mm high with a 5mm hole throw the centre with a N48 grade) What...

If you take 2 .5" x .5" cylinder neodymium magnets, and attach them sideways with N of first closest to the S of the 2nd and vice versa, they are attracted. However, when one is held stationary, and the other is rotated around, its seems that there is a perpendicular magnetic field that...

Hello all! I'm new to this site and new to electromagnets. I've done some research but now i need help from anyone who is willing. I'm playing around with electromagnets and neodymium magnets. Now i want the electromagnet to repel the neodymium. So first thing I can't use a ferrous material...

This is my first post and I am not sure if I am posting it in the right place. But I believe some electrical engineer could answer it better than any other engineer. Please anyone correct me if I am in the wrong place. I am using Neodymium magnets on a machine I am developing. They are...

Do neodymium magnets polarized like this and with this same shape exist? http://upload.wikimedia.org/wikipedia/commons/d/d8/Bar_magnet.jpg

Greetings, I am trying to figure out how I would design something that produces power using magnetic induction, but I think I've confused myself on some of the ideas and terms behind it. I found data on neodymium magnets from http://www.cy-magnetics.com/Mag_Pros_NdFeB.htm and it seems that...

Is there a material that blocks or reflects magnetic fields such as a field from a neodymium magnet?

I was watching this video on youtube called will it blend where they supposedly blended neodymium magnets into powder. I saw sparks coming from the process of it being powdered but I have read elsewhere that trying to file neodymium magnets is dangerous as it would be explosive. I am not sure...

I know this doesn't pertain so much to engineering but I figured you guys would know best. If you set the magnet next to a cell phone or TV, what kind of damage would be expected?

They pull a lot of pounds in ratio to their size, I was wondering if it would make any difference in the energy output if you replaced the normal magnet with a neodyniam.

This is an electrical question but bear with me for some background. I have a project creating an epoxy based granite material. The sphere packing density is quite high with aggregate sizes from 2 to 600 microns. So that means I'm left with a very thick mix. Plus the added complication of...

There are lots of patents on Neo magnets and they are difficult to sort out. Some of the patents restrict the use of the magnets that contain cobalt and/or have a tetragonal crystalline structure. Does someone know: What types of magnets contain cobalt? What types of magnets have a...

I've seen these things for sale on the web. http://www.amasci.com/neodemo.htmlhttp://www.kjmagnetics.com/safety.asp I consistently see the same claims: - they can easily pinch skin, like with a pair of pliers - they can shatter, showering you with high speed shards Are they really...

Does anyone know how does this molecule looks like? (I study Aerospace, don't ask me why do i want to know :cry: ) How does those atomos connect with each other: It's chemical formulae is: Nd_2Fe_1_4B

http://www.wondermagnets.com/cgi-bin/edatcat/WMSstore.pl?user_action=detail&catalogno=3138 I'm thinking of getting some, I just purchased some neodymium magnets. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2545710646