Temperature dependence of thermal stability in longitudinal media

Author

Batra, Sharat ; McMillan, Tom ; Torabi, Adam F.

Author_Institution

Quantum Corp., Shrewsbury, MA, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2736

Lastpage

2738

Abstract

The temperature dependence of the thermal stability factor (K_uV/k_BT) and the remanent coercivity are measured as a function of temperature from 20°C to 120°C. A significant decrease with temperature in both the thermal stability factor and remanent coercivity were observed due to temperature dependence of anisotropy energy (K_u). The high frequency signal loss over ten-years is calculated at an in-drive temperature of 80°C for media with a thermal stability factor of 100 at room temperature. When the measured temperature dependence of the thermal stability factor is taken into account, an additional 30% decrease in the high frequency signal after ten years will be observed over that calculated using only the thermal energy k_BT. This study emphasizes the importance of under-layer and the magnetic layer in affecting temperature dependence of thermal stability factor

Keywords

coercive force; magnetic anisotropy; magnetic recording; remanence; thermal stability; 20 to 120 C; anisotropy energy; high frequency signal loss; longitudinal medium; magnetic recording; remanent coercivity; temperature dependence; thermal stability; Anisotropic magnetoresistance; Coercive force; Energy measurement; Frequency measurement; Magnetic anisotropy; Perpendicular magnetic anisotropy; Temperature dependence; Temperature measurement; Thermal factors; Thermal stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800969

Filename

800969