Optimization of CoPt/B nanocomposite films for ultrahigh-density recording media

2001 ◽  
Vol 90 (6) ◽  
pp. 3112-3114 ◽  
Author(s):  
V. Karanasos ◽  
I. Panagiotopoulos ◽  
D. Niarchos ◽  
H. Okumura ◽  
G. C. Hadjipanayis
Keyword(s):  
Nanocomposite Films ◽  
Recording Media ◽  
Ultrahigh Density

Co3Pt Nanocomposite Films for Perpendicular Magnetic Recording Media

2010 ◽  
Vol 123-125 ◽  
pp. 27-30 ◽  
Author(s):  
Chih Long Shen ◽  
Po Cheng Kuo ◽  
S.C. Chen ◽  
C.D. Chen ◽  
S.L. Hsu ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Process Parameters ◽  
Magnetic Recording ◽  
Magnetic Layer ◽  
Nanocomposite Films ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Perpendicular Magnetic Recording ◽  
Significant Potential

The Co3Pt magnetic layer with thickness of 7~28 nm was deposited onto the Pt underlayer. The as-deposited Co3Pt/Pt double-layered films with or without a 5 nm Pt capped layer were annealed at temperatures between 275 and 375 °C in vacuum of 1 mTorr. The influences of process parameters on perpendicular magnetic properties of Co3Pt thin films were investigated. The Co3Pt film with perpendicular coercivity (Hc⊥) value of 3620 Oe and the perpendicular squareness (S⊥) of 0.7 could be achieved from the Co3Pt(18 nm)/Pt(100 nm) double-layered films by annealing at 300°C. Further added Tb30Co70 film on the Co3Pt/Pt double-layered film could greatly enhance the perpendicular magnetic properties of the film. The Hc⊥ and S⊥ of the Tb30Co70/Co3Pt/Pt film were as high as 6560 Oe and 0.88, respectively, which has significant potential to be applied in perpendicular magnetic recording media.

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.

FePt nanocomposite films for optical-magnetic hybrid recording media

2005 ◽  
Author(s):  
F. J. Yang ◽  
Hao Wang ◽  
H. B. Wang ◽  
X. Cao ◽  
J. A. Wang ◽  
...  
Keyword(s):  
Nanocomposite Films ◽  
Recording Media ◽  
Hybrid Recording

scholarly journals Fast and Slow Magnetization Processes in Magnetic Recording Media

2005 ◽  
Vol 887 ◽  
Author(s):  
J. Zhou ◽  
R. Skomski ◽  
S. Michalski ◽  
R. D. Kirby ◽  
D. J. Sellmyer
Keyword(s):  
Magnetic Recording ◽  
Remanent Magnetization ◽  
Thermal Activation ◽  
Information Loss ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Local Anisotropy ◽  
Thermally Activated ◽  
Ultrahigh Density ◽  
Magnetization Processes

ABSTRACTInformation loss due to thermal activation is a major concern in ultrahigh-density magnetic recording media. The usually considered mechanism is thermally activated magnetization reversal over micromagnetic energy barriers. However, micromagnetic approaches ignore local anisotropy fluctuations, which translate into a time-dependent reduction of the remanent magnetization. The effect is negligibly small in macroscopic magnets but becomes important on a scale of a few nanometers.

Magnetic Exchange-Coupled Sm(Co, R )/Cr ( R = Al, Si, Ti, Nb, Cu) Series Films for Ultrahigh-Density Longitudinal Recording Media

2003 ◽  
Vol 20 (2) ◽  
pp. 281-283 ◽  
Author(s):  
Wang Xiang ◽  
Li Zuo-Yi ◽  
Li Zhen ◽  
Cai Chang-Bo ◽  
Huang Zhi-Xin ◽  
...  
Keyword(s):  
Recording Media ◽  
Magnetic Exchange ◽  
Longitudinal Recording ◽  
Ultrahigh Density

CoPt/Ag(Cu) nanocomposite films for ultra-high density perpendicular magnetic recording media

2006 ◽  
Vol 505 (1-2) ◽  
pp. 77-80 ◽  
Author(s):  
Hao Wang ◽  
S.X. Xue ◽  
F.J. Yang ◽  
H.B. Wang ◽  
X. Cao ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
High Density ◽  
Nanocomposite Films ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Perpendicular Magnetic Recording

Feasibility of FePt longitudinal recording media for ultrahigh density recording

2000 ◽  
Vol 87 (9) ◽  
pp. 6953-6955 ◽  
Author(s):  
Seung-Young Bae ◽  
Kyung-Ho Shin ◽  
Jae-Yoon Jeong ◽  
Jung-Gi Kim
Keyword(s):  
Recording Media ◽  
Longitudinal Recording ◽  
Ultrahigh Density
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