Dynamic orientation ratio in longitudinal recording media

Piramanayagam, S.N.; Yin, J.H.; Zhao, H.B.; Kasim, J.; Chen, Y.J.; Zhang, J.; Hee, C.H.
August 2003
Applied Physics Letters;8/11/2003, Vol. 83 Issue 6, p1175
Academic Journal
The origin of orientation ratio (OR) in longitudinal recording media has been controversial in the literature. In the past, the observation of a higher OR for thinner magnetic films has been attributed to stress or thermal effects. Our measurements, carried out over a larger range of time scales, confirm that the thermal effects play a major role in the observation of a higher OR for thinner magnetic films. We point out that the OR is dynamic and follows a ln(t) behavior at larger time scales (5–1000 s). Our studies indicate that a larger OR and a more dynamic behavior of OR will be observed when K[sub u]V/k[sub B]T values are smaller. We also propose that the slope of dynamic OR can be used to compare the recording performance of media indirectly. © 2003 American Institute of Physics.


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