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Current induced spin wave excitations in spin transfer torque nano-contactsare known as a promising way to generate exchange-dominated spin waves at thenano-scale. It has been shown that when these systems are magnetized in thefilm plane, broken spatial symmetry of the field around the nano-contactinduced by the Oersted field opens the possibility for spin wave modeco-existence including a non-linear self-localized spin-wave bullet and apropagating mode. By means of micromagnetic simulations, here we show that insystems with strong perpendicular magnetic anisotropy (PMA) in the free layer,two propagating spin wave modes with different frequency and spatialdistribution can be excited simultaneously. Our results indicate that in-planemagnetized spin transfer nano-contacts in PMA materials do not host a solitonicself-localized spin-wave bullet, which is different from previous studies forsystems with in plane magnetic anisotropy. This feature renders theminteresting for nano-scale magnonic waveguides and crystals since magnontransport can be configured by tuning the applied current.

Current induced multi-mode propagating spin waves in a spin transfer torque nano-contact with strong perpendicular magnetic anisotropy