http://www.supermanhomepage.com/comics/comics.php?topic=comics-new_supes
Electromagnetic Force: Another facit of his Electron Manipulation powers, this power was first tried out by Superman in MOS #73, when he was attempting to protect Lex Luthor from Apokolips Parademons, and came up with the idea of magnetising the metal worn by his opponents, causing them to crash together in a useless pile.
One of many many powers Superman BLue has.