Temperature dependence of the magnetization reversal of thin-film longitudinal magnetic recording media
Abbreviated Journal Title
IEEE Trans. Magn.
activation volume; longitudinal recording media; magnetic switching; switching volume; thermal stability; SWITCHING FIELD; Engineering, Electrical & Electronic; Physics, Applied
As longitudinal magnetic recording media approach the superparamagnetic limit, temperature-dependent effects are becoming ever more important. This work reports an unexpected temperature dependence for the Sharrock stability parameter S typically given as KuV/k(B)T, where K-u is the unixial anisotropy, V the switching volume, k(B) is Boltzmann's constant, and T the temperature. Temperature-dependent vibrating sample magnetometer measurements were made of the saturation and remanent magnetization M-s and M-r, remanent coercivity H-cr, and K-u. The Sharrock equation was used to calculate S, and the time-independent switching field H-o of representative longitudinal recording media. Instead of the product Sk(B)T decreasing proportionally to K-u or H-o with increasing temperature as initially expected, we find Sk(B)T decreases at approximately half this rate.
Ieee Transactions on Magnetics
Article; Proceedings Paper
"Temperature dependence of the magnetization reversal of thin-film longitudinal magnetic recording media" (2004). Faculty Bibliography 2000s. 4273.