I've experienced problems with steel samples in the SEM. It seems I can't get the specimens demagnetized properly. A conventional demagnetizer (More info in the attatched file) managed to weaken the magnetization significantly but doesn't quite do the job. Is there any other way or instruments that may do the trick? (no heating)
Thanks in advance
Hi Thomas,
thanks for your advice.
I guess thats essentially what those demagnetizers do as well, isn't it? We do have a (rather ancient) permagraph that could perhaps be used, but I doubt that it will perform a lot better that the demagnetizer, unless there's something I'm missing...
I agree with the previous answer, perhaps you can use SQUID or VSM to apply the procedure while heating up the sample in the chamber. Also you do not need a super high magnetic field. As long as your applied field can saturate the sample it suffice the need for this process.
First make an iron coil ( soft Iron) winded with copper wire. be sure that the winded wire is long enough to tolerate a high voltage electricity. the winded coil should be connected to an AC electricity (preferably the grid lines electricity power), and put your sample in one of its poles for demagnetizing. Be cautious there is no short circuit on the winded wire when you are working with the coil.
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