Although superexchange is expected to be most prominent in insulators both exchange mechanisms always contribute to the magnetic interactions and direct exchange may be significant in some cases.
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Effect of Hubbard U-corrections on the electronic and magnetic properties of 2D materials: a high-throughput study.
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The sentences
From panels (a) and (c) it is clear that the anti-ferromagnetic exchange interactions decrease upon inclusion of the Hubbard U while the ferromagnetic interactions do not seem to exhibit an obvious trend.
Like the exchange coupling, the MA shows a decreasing trend with U.