Characteristic of Nano-barium-ferrite as Recording Media Using HAMR Technology

Abstract

Micromagnetic study using Barium-ferrite has been performed with the magnetic parameters such as saturated magnetization 4800 Gauss, Gilbert damping 0.8, and exchange constant 6.3´10-7 erg/cm3. This research is performed to investigate the characteristics of optimum magnetic anisotropy of Barium-ferrite as HDD media using HAMR technology. Barium-ferrite is chosen to be evaluated because of its strong magnetic anisotropy which potentially used as high-density storage media. The researched magnetic anisotropy of the material has a range of (1.0-4.5)´106 erg/cm3 which performed using two schemes, which are RBW and MRDP schemes. RBW scheme is used to investigate the appropriate anisotropy material to be used as HDD media. The feasibility of anisotropy to use is observed from the thermal stability level, shown by the value of energy barrier which is higher than 70 kBT. On the other hand, MRDP scheme is used to estimate the required magnitude of the writing magnetic field to reverse the magnetization of the material when being stimulated with the thermal field. It is found that Barium-ferrite with magnetic anisotropy ranging from (1.00-3.75)´106 erg/cm3 has excellent thermal stability, suitable to be used as HDD media. Moreover, hundreds Oersted of magnetic field induction can be used to reverse the bit magnetization.