Control wizard wants more control

[Harp]

I can't just make a new spell that binds undead, because that would pretty clearly fall under Necromancy, which I chose as one of my banned schools.

So I was thinking about a line of Abjuration spells that targets and binds the magic that animates undead, effectively keeping them controlled without actually targeting them.

My wizard wouldn't get all his bonuses to Enchantment spells (Spell Focus etc), but at least he will have found a way to partially cover his greatest weakness, and be able to do his job when encountered by undead.

Or is there some existing way for an enchanter wizard to control undead that I couldn't find when I was researching the problem?

You banned Necro on an enchanter? Ugh... I don't envy your position, but what campaign hasn't had undead in it? Necromancery has the best options for dealing with undead, so I'm not surprised you're asking for advice.

Your probably better off focusing on spells that deal damage rather than goof them up, as the immunities on even zombies are pretty numerous. Just about any evocation is your friend.

If you're still more interested in blocking them up, conjuration is your friend. 0 Intelligence means mindless undead go after the closest living thing they percieve, so blocking LoS (Obscuring Mist, Fog Cloud, Darkness, etc.) pretty effectively turns them off, but this is more a matter of opinion and not necessarily the style of your DM. Moreover, if a master creature with intelligence is around their adaptation improves somewhat. You can still gum them up with Grease and Web regardless of how your DM interprets their ability score. Illusions should also work, but again, its contingent on your DM's interpretation.

Don't ignore the transmutation school entirely as well. While your options for dealing with undead may be limited, there's plenty of things here you can use to your benefit. Exp. Retreat, Water-walking, Spiderclimb, and Fly, all give you the ability to put ground between you and your assailants, which means in the worst case scenario you can just use your crossbow a bit. Also keep in mind that despite the fact Animate Rope can only be used against a single opponent and it has a fairly limited range (tossing the rope at a range increment of 10), hardly anyone's immune to getting tied up and spell resistance doesn't apply.

Probably the best point that's been brought up so far is that Glitterdust can be used to blind undead. This is a seriously underrated spell, one that is not only offensive but acts as a contingency against an invisible or stealthy opponent. If you've got the coin and can deal with the fact it will only last for three rounds, I'd suggest just getting a wand of it.