It's probably quite unpractical, if possible at all.
The Original Post (OP) seems to mean something like moving the air "out of the way" from above the disk. In order to keep a significant pressure difference between the upper and lower parts of the disk, we'd have to maintain an extremely large sideways flow to compensate the atmosphere rushing to the lower pressure region. We'd be better off directing this flow downwards to create lift, in a version of the magnetohydrodynamic propulsion that has been called MHD aerodyne.
With current technology, MHD propulsion hasn't taken off even for salt water boats, an arguably much easier setting (the required propellant speed is inversely proportional to the propellant density for the same thrust, and salt water is not only much denser than air, it's also already conductive).
On the other hand, MHD propulsion in tandem with traditional turbojet engines is being considered for hypersonic and space access flight: The MHD-controlled turbojet engine: an alternate powerplant for acsess to space (Blankson & Schneider 2014 - DOE/NETL MHD Workshop);
The Effect of Magnetohydrodynamic (MHD) Energy Bypass on Specific Thrust for a Supersonic Turbojet Engine (Benyo 2010 - NASA/TM—2010-216734, AIAA–2010–232). It's also being touted as a solution to problems beyond propulsion, such as shock wave control: MHD hypersonic flow control for aerospace applications (Petit & Geffray 2009), though some of the main author positions, in particular on UFOs are controversial.