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I'm not a physicist, this is what i understand : They've found that very quick heating of a magnetic dipole can cause it to flip. Currently this is flipping is done by a magnetic head (in hard disk drives). Since bursts of infra red light can be used for heat pulses, recording can be sped up considerably.

How could that ever work, for infrared to affect magnetism?

You ignored the article and what the GP said: Through heat. Not (directly) by the light.

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