Why Manganese-Gallium Is Not The Next Neodymium-Iron-Boron "... This new Mn-Ga compound is certainly very interesting scientifically; but unless someone finds a primary Ga deposit, and can perfect inexpensive nanoscale material production, it’s not going to “revolutionize the production of magnets found in computers, mobile phones, electric cars and wind-powered generators” anytime soon. "
http://www.techmetalsresearch.com/2011/12/why-manganese-gallium-is-not-the-next-neodymium-iron-boron/ Still Mn-Ga could have some specific usage based on the fact it would never, or hardly, loose it's magnetic field.
