magnet question

[JayUK]

Hi,

 

Just wondering if there is anything that you can paint or stick onto the 'attracting' part of a magnet to stop it being so magnetic?

 

thanks

[swansont]

A big ol' piece of iron will act as a flux return, and reduce the field outside of it.

[JayUK]

thanks for your reply. Would tungsten putty work by any chance? A complete guess

[YT2095]

no, it isn`t ferromagnetic.

it needs to be either Iron, Nickel or Cobalt based (as the free metal not a compound), a mixture will work though.

[Mag]

no, it isn`t ferromagnetic.

it needs to be either Iron, Nickel or Cobalt based (as the free metal not a compound), a mixture will work though.

 

what about copper?

[YT2095]

no, no copper, there are only 3 metals that are naturally ferromagnetic, and those are the ones I listed.

 

unless you`re thinking of applying the inverse square law in which case a piece of Plastic will suffice.

[Mag]

no, no copper, there are only 3 metals that are naturally ferromagnetic, and those are the ones I listed.

 

unless you`re thinking of applying the inverse square law in which case a piece of Plastic will suffice.

 

then maybe Im not understanding.

doesnt he want something that reducing the magnetic attraction?

 

isnt ferromagnetism just another word for magnetism?

[YT2095]

not quite no, a ferromagnetic material will enable Flux Return (as Swansont pointed out), the Other method as I said is to invoke the inverse square rule.

 

and short of damaging the magnet itself (impact or heating) on a perm basis, these are the only 2 Viable option open.

[Mag]

not quite no, a ferromagnetic material will enable Flux Return (as Swansont pointed out), the Other method as I said is to invoke the inverse square rule.

 

and short of damaging the magnet itself (impact or heating) on a perm basis, these are the only 2 Viable option open.

 

ahh ok.

 

thanks

[YT2095]

.

[swansont]

Well, it's a dipole so it's inverse-cube, but the concept is the same.

[alan2here]

Your not going to get a magnet with 1 pole if you attach a piece of metal to the other. I think by your first post this is what you where getting at. Also the whole magnet attracts, both ends attract metals most and the north attracts the south of another magnet and vice versa. Same poles repel.

[John Cuthber]

"there are only 3 metals that are naturally ferromagnetic"

these 3 are Fe, Ni, Co, Gd and (I'm told) Pu.

[insane_alien]

oh come on now, you know YT is bad at maths.

 

also, Dy is ferromagnetic at low temperatures.

[swansont]

"there are only 3 metals that are naturally ferromagnetic"

these 3 are Fe, Ni, Co, Gd and (I'm told) Pu.

 

I don't know about Pu — I don't find anything confirming that — but Gd's Curie point is 293 K, so as long as YT likes his room warm enough, the math works.

[John Cuthber]

I don't plan to test Pu but my lump of gadolinium is clearly magnetic- you can pick it up with a magnet. It's quite a nice warm day here, definitely over 293K. It would be ridiculously expensive compared to steel, but you could use it to screen a magnetic field.

[swansont]

I don't plan to test Pu but my lump of gadolinium is clearly magnetic- you can pick it up with a magnet. It's quite a nice warm day here, definitely over 293K. It would be ridiculously expensive compared to steel, but you could use it to screen a magnetic field.

 

Gadolinium is paramagnetic above the Curie temperature.

[John Cuthber]

"Gadolinium is paramagnetic above the Curie temperature."

Very paramagnetic, and I still think you could use it for screening a field which was the essence of the original question.

[alan2here]

How paramagnetic when above the curi temperature?

 

More

Mu-Metal

Somewhere In-between

Iron (I know this is ferromagnetic but I mean in terms of force when a magnet is atracted to it and it has not been magnitised)

Less

[John Cuthber]

I haven't measured it, but it seems less strongly atracted to a magnet than a typical bit of steel when it's at room temperature. On the other hand I can pick it up with a magnet.

[Innit]

no, it isn`t ferromagnetic.

it needs to be either Iron, Nickel or Cobalt based (as the free metal not a compound), a mixture will work though.

 

This doesn't really help answer the question, but -

JayUK, notice the word ferromagnetic. Ferro, means iron in Italian (and I suppose also Latin), which is where Fe came from, as the element's symbol.