Ballistic (precessional) contribution to the conventional magnetic switching

Abstract

We consider a magnetic moment with an easy axis anisotropy energy, switched by an external field applied along this axis. Additional small, time-independent bias field is applied perpendicular to the axis. It is found that the magnet's switching time is a non-monotonic function of the rate at which the field is swept from "up" to "down". Switching time exhibits a minimum at a particular optimal sweep time. This unusual behavior is explained by the admixture of a ballistic (precessional) rotation of the moment caused by the perpendicular bias field in the presence of a variable switching field. We derive analytic expressions for the optimal switching time, and for the entire dependence of the switching time on the field sweep time. The existence of the optimal field sweep time has important implications for the optimization of magnetic memory devices.

References in corpus (4)

• Switching of magnetization by non-linear resonance studied in single nanoparticles
• Magnetization reversal in the anisotropy-dominated regime using time-dependent magnetic fields
• Critical current under an optimal time-dependent polarization direction for Stoner particles in spin-transfer torque induced fast magnetization reversal
• Minimal field requirement in precessional magnetization switching

Cited by in corpus (3)

• Phase diagram and optimal switching induced by spin Hall effect in a perpendicular magnetic layer
• Fast magnetization reversal of nanoclusters in resonator
• Analytic treatment of the precessional (ballistic) contribution to the conventional magnetic switching