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We demonstrate field and current controlled magnetodynamics in nanocontactspin-torque nano-oscillators (STNOs) based on orthogonal magnetic tunneljunctions (MTJs). We systematically analyze the microwave properties (frequency$f$, linewidth $\Delta f$, power $P$, and frequency tunability $df/dI$) withtheir physical origins---perpendicular magnetic anisotropy (PMA), damping-likeand field-like spin transfer torque (STT), and voltage-controlled magneticanisotropy (VCMA). These devices present several advantageous characteristics:high emission frequencies ($f> 20$ GHz), high frequency tunability($df/dI=0.25$~GHz/mA), and zero-field operation ($f\sim 4$ GHz). Furthermore, adetailed investigation of $f(H, I)$ reveals that $df/dI$ is mostly governed bythe large VCMA (287~fJ/(V$\cdot$m)), while STT plays a negligible role.

Magnetodynamics in orthogonal nanocontact spin-torque nano-oscillators based on magnetic tunnel junctions