Activation volume and correlation to media noise in high-density longitudinal recording media

1999 ◽  
Vol 35 (5) ◽  
pp. 2652-2654 ◽  
Author(s):  
B.R. Acharya ◽  
T. Suzuki ◽  
R. Takano
1993 ◽  
Vol 73 (10) ◽  
pp. 5566-5568 ◽  
Author(s):  
T. P. Nolan ◽  
R. Sinclair ◽  
R. Ranjan ◽  
T. Yamashita

2003 ◽  
Vol 39 (5) ◽  
pp. 2261-2263
Author(s):  
Mingjun Yu ◽  
B.R. Acharya ◽  
G. Choe

1998 ◽  
Vol 517 ◽  
Author(s):  
Sudhir S. Malhotra ◽  
Brij B. Lal ◽  
Michael A. Russak

AbstractIn this work the effect of grain size and magnetic switching volume on media noise due to intergranular coupling for CoCrTaPt/Cr thin film media deposited at substrate temperature of 160 and 260°C are investigated. The film deposited at substrate temperature of 260°C showed weaker intergranular interaction and lower media noise compared to the film deposited at 160°C. The magnetic switching volume (V*) is an important consideration for thermal stability and media noise in high density recording media. The magnetic switching volume V* for the film deposited at 160 and 260°C was calculated to be 3.7 x 10-18 and 3.2 x 10-18 cm3 respectively. The magnetic switching volume is correlated to the average Co-alloy grain size, media noise and the interactions between the grains.


Author(s):  
G.A. Bertero ◽  
R. Sinclair

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.


2021 ◽  
Author(s):  
Hiroko Tokoro ◽  
Asuka Namai ◽  
Shin-ichi Ohkoshi

Recent developments in magnetic films composed of epsilon-iron oxide are introduced. The film performance is studied and improved toward the next-generation of high-density magnetic recording media.


1994 ◽  
Vol 18 (S_1_PMRC_94_1) ◽  
pp. S1_467-470
Author(s):  
Michinobu SUEKANE ◽  
Masao MIYAMURA

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