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Detailed understanding of spin dynamics in magnetic nanomaterials isnecessary for developing ultrafast, low-energy and high-density spintroniclogic and memory. Here, we develop micromagnetic models and analyticalsolutions to elucidate the effect of increasing damping and uniaxial anisotropyon magnetic field pulse-assisted switching time, energy and field requirementsof nanowires with perpendicular magnetic anisotropy and yttrium irongarnet-like spin transport properties. A nanowire is initially magnetized usingan external magnetic field pulse (write) and self-relaxation. Next, magneticmoments exhibit deterministic switching upon receiving 2.5 ns-long externalmagnetic pulses in both vertical polarities. Favorable damping({\alpha}~0.1-0.5) and anisotropy energies (10^4-10^5 J m^-3) allow for as lowas picosecond magnetization switching times. Magnetization reversal with fieldsbelow coercivity was observed using spin precession instabilities. Acompetition or a nanomagnetic trilemma arises among the switching rate, energycost and external field required. Developing magnetic nanowires with optimizeddamping and effective anisotropy could reduce the switching energy barrier downto 3163kBT at room temperature. Thus, pulse-assisted picosecond and low energyswitching in nanomagnets could enable ultrafast nanomagnetic logic and cellularautomata.

Pulse-assisted magnetization switching in magnetic nanowires at picosecond and nanosecond timescales with low energy