Thickness Dependence of Magnetic Switching Dynamics of Barium-Ferrite as A High-Density Perpendicular Magnetic Storage Media

P P Aji,Ferdy S Rondonuwu ,Nur Aji Wibowo

doi:10.15294/jpfi.v13i2.8499

P P Aji, Ferdy S Rondonuwu + Show 1 more

Open Access

https://doi.org/10.15294/jpfi.v13i2.8499

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Abstract

Micromagnetic study of material thickness dependence of Barium-ferrite nano-dot magnetization dynamics has been performed. The used materials characteristics in this research represent the properties of Barium-ferrite. Barium-ferrite was modeled as a nano-dot with a surface area of 50 50 nm2 and its thickness varies from 5 nm to 100 nm. This nano-dot was simulated using micromagnetic simulator software by solving Landau-Lifshitz-Gilbert equation. According to this study, obtained that the Barium-ferrite nano-dot has excellent thermal stability. Magnetization rate of this nano-dot decreases exponentially with the increase of thickness. The fastest magnetization rate observed in 5 nm of nano-dot thickness, meanwhile 45 nm for the slowest rate. Magnetization reversal mode of this Barium-ferrite nano-dot is dominated by domain wall nucleation and propagation. During the propagation of the domain wall, the exchange interaction becomes the main aspect compared to the other contributed energies.

Highlights

Availability of high densities Hard-disk drive is emerging to answer the demand (Kim et al, 2015)
The purpose of this study is to examine the effect of Bariumferrite thickness on the magnetization reversal characteristic of switching field, magnetization rate, and the dynamics of domain wall propagation
Heff is the effective induced magnetic field which acts as the resultant of a various factor that sourced from the external magnetic field and internal properties of materials which consist of anisotropy field (Hk), demagnetization field (Hd), and exchange field (Hex) as given in Eq(2) (Schrefl, Fidler, Suess, Scholz, & Tsiantos, 2006) (Herianto, Rondonuwu, & Wibowo, 2015): Heff = Hk + Hd + Hex + Hext

Summary

Introduction

Availability of high densities Hard-disk drive is emerging to answer the demand (Kim et al, 2015). In attaining the required densities, the storage unit should be downsized in nanometer (Kim et al, 2007) (Sadnawanto & Purnama, 2014) This reduction scale causes thermal instability (Wood, 2009)(Budi Purnama, Koga, Nozaki, & Matsuyama, 2009) (Liu et al, 2016) and its information would be lost because of low magnetic energy (Ma & Liu, 2008). In overcoming this issues, the uses of perpendicular magnetic anisotropy (PMA) material as a storage unit media is required (Waseda et al, 2008) (Alebrand et al, 2012) (Azizah, Trihandaru, & Wibowo, 2016).

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