Micromagnetic Simulation of Thermal Activation Volume in Perpendicular Recording Media With Dispersions of Grain Size

2006 ◽  
Vol 42 (10) ◽  
pp. 2393-2395 ◽  
Author(s):  
M. Igarashi ◽  
F. Akagi ◽  
Y. Sugita
Keyword(s):  
Grain Size ◽  
Thermal Activation ◽  
Activation Volume ◽  
Micromagnetic Simulation ◽  
Recording Media ◽  
Perpendicular Recording

Determination of Critical Volumes in Recording Media

1998 ◽  
Vol 517 ◽  
Author(s):  
K. O'Grady ◽  
P. Dova ◽  
H. Laidler
Keyword(s):  
Waiting Time ◽  
Thermal Activation ◽  
Activation Volume ◽  
Recording Media ◽  
Thermal Loss ◽  
Ultrahigh Density

AbstractIn this overview paper the concept of thermal activation of magnetisation reversal is reviewed in terms of the Wohlfarth-Gaunt formalism. This formalism gave rise to the concept of an activation volume of reversal. Other techniques have been developed for the determination of activation or critical volumes of reversal and these are reviewed. It is found that these methods give the same approximate value for the activation volume but the only method based on micromagnetism is the waiting time experiment which is consistent with Gaunt. Factors which affect the activation volume such as incoherent reversal and intergranular coupling are discussed together with measures that may be required in order to generate ultrahigh density recording media that are relatively free from thermal loss of signal.

Computer Simulation of granular perpendicular recording media with dispersions of grain size and grain separation

2005 ◽  
Vol 41 (10) ◽  
pp. 3070-3072
Author(s):  
M. Igarashi ◽  
F. Akagi ◽  
M. Hara ◽  
A. Nakamura ◽  
Y. Hosoe ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Grain Size ◽  
Recording Media ◽  
Perpendicular Recording

Grain size reduction in CoCrPt:SiO2 perpendicular recording media with oxide-based intermediate layers

2006 ◽  
Vol 89 (16) ◽  
pp. 162504 ◽  
Author(s):  
S. N. Piramanayagam ◽  
C. K. Pock ◽  
L. Lu ◽  
C. Y. Ong ◽  
J. Z. Shi ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Reduction ◽  
Recording Media ◽  
Perpendicular Recording ◽  
Intermediate Layers
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