  Ferrimagnets, which contain the advantages of both ferromagnets (detectable
moments) and antiferromagnets (ultrafast spin dynamics), have recently
attracted great attention. Here we report the optimization of epitaxial growth
of a tetragonal perpendicularly magnetized ferrimagnet Mn2Ga on MgO. Electrical
transport, magnetic properties and the anomalous Hall effect (AHE) were
systematically studied. Furthermore, we successfully integrated high-quality
epitaxial ferrimagnetic Mn2Ga thin films onto ferroelectric PMN-PT single
crystals with a MgO buffer layer. It was found that the AHE of such a
ferrimagnet can be effectively modulated by a small electric field over a large
temperature range in a nonvolatile manner. This work thus demonstrates the
great potential of ferrimagnets for developing high-density and low-power
spintronic devices.
