Embodiments of the present invention generally relate to a MAMR head. The MAMR head includes an STO. The STO has a first surface at a media facing surface, a second surface that is opposite the first surface and a third surface adjacent to the first and second surfaces. The first and third surfaces form a first acute angle and the second and third surfaces form a second acute angle, where the second acute angle is less than or equal to the first acute angle. Having this configuration, the electrical current going through the STO is substantially perpendicular to the STO, which causes the spin torque to be maximized.