Shape anisotropy effect on magnetization reversal induced by linear down chirp pulse

TL;DR

This study explores how shape anisotropy influences magnetization reversal in magnetic nanoparticles under a specific microwave pulse, revealing optimal conditions for faster, more efficient magnetic switching.

Contribution

It demonstrates the impact of shape anisotropy on reversal parameters and introduces combined microwave and current methods for improved magnetic data storage.

Findings

Reversal parameters decrease with increased shape anisotropy.

Optimal damping exists for fastest magnetization reversal.

Combining microwave pulses with spin-polarized current reduces energy requirements.

Abstract

We investigate the influence of shape anisotropy on the magnetization reversal of a single-domain magnetic nanoparticle driven by a circularly polarized linear down-chirp microwave field pulse (DCMP). Based on the Landau-Lifshitz-Gilbert equation, numerical results show that the three controlling parameters of DCMP, namely, microwave amplitude, initial frequency and chirp rate, decrease with the increase of shape anisotropy. For certain shape anisotropy, the reversal time significantly reduces. These findings are related to the competition of shape anisotropy and uniaxial magnetocrystalline anisotropy and thus to the height of energy barrier which separates the two stable states. The result of damping dependence of magnetization reversal indicates that for a certain sample shape, there exists an optimal damping situation at which magnetization is fastest. Moreover, it is also shown that the required microwave field amplitude can be lowered by applying the spin-polarized current simultaneously. The usage of an optimum combination of both microwave field pulse and current is suggested to achieve cost efficiency and faster switching. So these findings may provide the knowledge to fabricate the shape of a single domain nanoparticle for the fast and power-efficient magnetic data storage device.