Abstract
We investigate effects of a small DC spin-polarized current on the pulse field-induced precessional magnetization reversal in a thin elliptic magnetic element by micromagnetic simulations. We find that the spin-polarized current not only broadens the time window of the pulse duration, in which a successful precessional reversal is achievable, but also significantly suppresses the magnetization ringing after the reversal. The pulse time window as well as the decay rate of the ringing increase with increasing the current density. When a spin-polarized current with 5 MA/cm2 is applied, the time window increases from 80 ps to 112 ps, and the relaxation time of the ringing decreases from 1.1 ns to 0.32 ns. Our results provide useful information to achieve magnetic nanodevices based on precessional switching.
Highlights
Ultrafast magnetization reversal is a key issue for the development of several forthcoming nanoscale magnetic devices, such as magnetic data storage,[1,2,3] nonvolatile memories,[4] and logic devices.[5]
The temporal evolution under the action of a long pulse field is given as an inset of Fig. 1(b), which gives a magnetization precessional period of 230 ps
It is evident that the precessional reversal is sensitive to the pulse duration
Summary
Ultrafast magnetization reversal is a key issue for the development of several forthcoming nanoscale magnetic devices, such as magnetic data storage,[1,2,3] nonvolatile memories,[4] and logic devices.[5]. Gerrits et al.[7] demonstrated that a reliable precessional reversal in micrometre-sized elliptical permalloy element is possible at switching time of about 200 ps. The reliable ultrafast precessional reveral has been achieved by a picosecond spin-polarized current pulse in the spin valves and magnetic tunnel junctions.[15,16,17,18,19,20,21]. Precessional reversal, a residual magnetization oscillation or ringing around the new equilibrium state persists for several nanoseconds.[12,13,14,24] This increases the time needed to execute consecutive switching events. Effective suppression of the magnetization ringing is necessary and still remains to be a problem for the application of precessional reversal in ultrafast magnetic devices. A strategy is presented for broadening the pulse time window and suppressing the magnetization ringing
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