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I had deposited Fullerene on top of Cobalt thin film which result in increase of coercivity.

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closed as unclear what you're asking by Dan, Dilaton, Waffle's Crazy Peanut, Qmechanic Jul 24 '13 at 18:53

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Great observation !

we know the diamagnetic response has its origin in the organic matter of the biological substances and organelles, such as amyloplasts. Due to this I hope that Fullerene may be having diamagnetic behaviour too...........

This solves your problem i think.It's obvious that coercivity will increase.

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