Another that both gets good reviews and is affordable is the Logitech
Ultrathin Magnetic Clip - On Keyboard Cover.
Room - temperature chiral magnetic skyrmions in
ultrathin magnetic nanostructures.
Not exact matches
Observation of room - temperature
magnetic skyrmions and their current - driven dynamics in
ultrathin metallic ferromagnets.
A true 2D magnet would retain its magnetism at the single - atom layer, but this
ultrathin crystal was only
magnetic at multiple layers.