round magnet Shielding magnetic field of round magnet

[Ashish]

Hello all,

Apologize for fancy title, but it is not that much complex. I am armature in leather crafts and learning from this great community.

Now on topic, recently I made design for one zip wallet. where it has one side, 3 slots for cards. And just in-front of cards, I have to placed 25x2 mm round magnet for some other purpose. For reference, I have attached design. Now as you can see in photo, Black round is magnet (which I can hide by placing yellow square leather on it). Now above that magnet has 3 slots for cards, and slots continues behind magnet (shown as sky blue card).

Now my concern is, magnet can easily destroy atm cards' black magnetic tape (demagnetized and erase info on cards). So I have to put something in-between magnet and cards to protect atm cards. There are ferromagnetic metals that can shield magnetic field for some extend. But they all are metal and cant be sew. I did some research on magnet and came to know that, either I put some ferromagnetic metal sheet inbetween or atleast 3-5mm thick material that would be enough to protect cards. 3-5 mm materials would be make wallet more thick and I am looking for another thin option. Anybody came across this type of situation? and what can be remedy for this. Or anybody know any thin material that can shield magnetic wave good enough and can easily put in linings.

 

Thanks in advance.

[kgg]

The amount of magnetic field is not only going to depend on the size of magnet but the type magnet you are planning on using. The best solution is to remove the magnet from the design and come up with a different method of attachment otherwise you may have some unhappy customers with scramble info on their cards.

kgg

[Rockoboy]

If the magnetic is for a closure, I would be trying to use Velcro.

If there is a different purpose for the magnet being there, any further ideas would depend on the purpose of the magnet.

[mikesc]

Many countries are now on "Chip and PIN"*, ( mag stripe is so insecure it is ridiculous ) so magnetic closures are OK for them..depends on where your target market is.

Also known as EMV cards.
https://en.wikipedia.org/wiki/EMV

Edited September 2, 2019 by mikesc

[Ashish]

16 hours ago, kgg said:

The amount of magnetic field is not only going to depend on the size of magnet but the type magnet you are planning on using. The best solution is to remove the magnet from the design and come up with a different method of attachment otherwise you may have some unhappy customers with scramble info on their cards.

kgg

Hey thanks for the response. Right now I am going to make one with few layers for protection and trial and error method on my own cards. I will use wallet first for few months and if it it okay with my cards then only I will provide it to my customers. Meanwhile also trying to find other in-layer thin material. At last if there is none working then I would like to remove magnet entirely.

[Ashish]

11 hours ago, Rockoboy said:

If the magnetic is for a closure, I would be trying to use Velcro.

If there is a different purpose for the magnet being there, any further ideas would depend on the purpose of the magnet.

Magnet is not for closure. It is for pocket purpose. manly metal things that can directly stick on it and remain still in wallet. Also I search and there are one-sided magnets in market for the refrigerators. But it is not strong enough tru leather layer. Would like to know if there are strong one sided magnets available. or any other option.

 

Thanks.

11 hours ago, mikesc said:

Many countries are now on "Chip and PIN"*, ( mag stripe is so insecure it is ridiculous ) so magnetic closures are OK for them..depends on where your target market is.

Also known as EMV cards.
https://en.wikipedia.org/wiki/EMV

Hey thanks for the link. But it is very new here in my country, most of the cards still have magnetic strip. But nowadays new cards come with chip.

[chrisash]

Intrigued as to what these metal things could be 

[Ashish]

2 hours ago, chrisash said:

Intrigued as to what these metal things could be 

Hey, Its for small objects like keys, pendrive with metal body or coins if it made from metal that attracts magnet. I haven't made one, I will post picture here when I make one. Its quite innovative design. Thanks.

[mikesc]

Ummm..You don't really want to use strong magnets near "pen drives"..You'll get away with "most of the time", just until you don't.

Edited September 3, 2019 by mikesc
typo

[Ashish]

48 minutes ago, mikesc said:

Ummm..You don't really want to use strong magnets near "pen drives"..You'll get away with "most of the time", just until you don't.

Hey there, Dont worry about pendrive, as it is very safe near magnets. pendrives and SSD are pretty safe with magnet see here. Again, I would experiment for few month with my atm cards aswell as with pendrive to see any effect before I make more wallets. Also prototype is almost ready and I succeed to shield most of magnetic field but wallet get thick, I will post few pictures here.