Tiny, tiny magnets

[cteno4]

On ebay you can get small neodymium magnets down to discs 2mm dia x 1mm thick.

 

but if you want really tiny magnets (down to 0.25mm cubes) go to super magnet man! Not cheap and of course not a lot of pull that tiny, but they have em!

 

https://supermagnetman.com/collections/micro-magnets

 

cheers

 

jeff

[Cat]

Interesting.  Not sure what I would do with ones that tiny....
 
For the more normal neodynes of 2mm or larger diameter, I tend to buy the by the 100 count bags from Deal Extreme.  
If there's a modelling problem, I've got a magnet for that!

[chadbag]

Would the super small ones work to trigger sensors and stuff?  I would think being rare earth that even small should put out enough magnetic field to trigger but I don't know enough about this.  Really small ones could be blended in on the bottom of vehicles to trigger sensors (if strong enough) without being really noticable.

[cteno4]

Probably too far to trip Hall effect sensors. I thin folks have good luck with 3 or 4mm x 1mm discs. Unless you don’t like having a small disc there whe you flip over a car. Small like 2-4mm cubes could be used and just look like a pice of undercarriage equipment.

 

jeff