Anyway, Cap's shield is an older form of Vibranium-Adamantium composite which is a lost formula (So is Cap's Super Soldier Serum, some how Marvel Universe is fond of losing formulae). Later Adamantium formula is derived from his shield, some say Adamantium is discovered by accident through this process. So no, Wolvie's claw can't cut through his shield as proven is some crossovers where Wolvie vs Cap. Wolvie's claw is near unbreakable, so there is no 矛盾 to talk about.
Oh, vibranium absorbs vibration, that explains how the shield takes big impacts.
I think Adamantium is "immuned" to magnetic force. If I remember correctly Magneto failed stripping Adamantium from Wolvie's skeleton.