Thermal Spin-Current Generation in the Multifunctional Ferrimagnet Ga0.6Fe1.4O3

In recent years, multifunctional materials have attracted increasing interest for magnetic memories and energy-harvesting applications. Magnetic insulating materials are of special interest for this purpose, since they allow the design of more efficient devices due to the lower Joule heat losses. In this context, Ga0.6Fe1.4O3 (GFO) is a good candidate for spintronics applications, since it can exhibit multiferroicity and presents a spin Hall magnetoresistance similar to the one observed in a yttrium-iron-garnet (YIG)/Pt bilayer. Here, we explore GFO utilizing thermospin measurements in an on-chip approach. By carefully considering the geometry of our thermospin devices we are able to quantify the spin Seebeck effect and the spin-current generation in a GFO/Pt bilayer, obtaining a value comparable to that of YIG/Pt. This further confirms the promises of an efficient spin-current generation with the possibility of an electric field manipulation of the magnetic properties of the system in an insulating ferrimagnetic material.