Graded Media Design for Area Density of Up to 2.5 Tb/in $^{2}$

Author

Hahn, David ; Bashir, Muhammad Asif ; Schrefl, Thomas ; Cazau, Alexandru ; Gubbins, Mark A. ; Suess, Dieter

Author_Institution

St. Polten Univ. of Appl. Sci., St. Polten, Austria

Volume

46

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

1866

Lastpage

1868

Abstract

Feasibility of perpendicular magnetic recording up to an area density of 2.5 Tb/in² is investigated. Magnetic grains of 4 nm diameter with 1 nm oxide layer are required to achieve such a high density. Thermal stability of the grains is achieved by increasing the overall thickness of the grain. Magnetocrystalline anisotropy is graded within a grain in such a way that nucleation and propagation of the reversed domain wall matches with the available head field. Different design specifications are investigated to achieve higher objective function, i.e., energy barrier per switching field.

Keywords

magnetic anisotropy; magnetic domain walls; nucleation; perpendicular magnetic recording; thermal stability; area density; energy barrier; graded media design; magnetic grains; magnetocrystalline anisotropy; nucleation; oxide layer; perpendicular magnetic recording; reversed domain wall; switching field; thermal stability; Anisotropic magnetoresistance; Magnetic anisotropy; Magnetic domain walls; Magnetic domains; Magnetic recording; Magnetic separation; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Soft magnetic materials; Thermal stability; Domain wall nucleation; domain wall propagation; graded media; perpendicular magnetic recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2039922

Filename

5467378