Composite media for perpendicular magnetic recording
@article{Victora2005CompositeMF, title={Composite media for perpendicular magnetic recording}, author={Randall H. Victora and Xiao Shen}, journal={IEEE Transactions on Magnetics}, year={2005}, volume={41}, pages={537-542} }
A composite perpendicular recording media consisting of magnetically hard and soft regions within each grain is proposed. Application of applied field initially causes the magnetization of the soft region to rotate and, thus, change the angle of the effective field applied to the hard region. This important change in the effective field is enabled by an exchange layer that moderates the interaction between the two regions. Energy arguments show that the resulting performance (as measured by the…
Figures and Tables from this paper
468 Citations
Composite media (dynamic tilted media) for magnetic recording
- Materials Science
- 2005
We designed and fabricated a composite magnetic recording medium with exchange decoupled magnetic grains that consist of two vertically exchange-coupled magnetic regions (one is magnetically soft and…
Exchange coupled composite media for perpendicular magnetic recording
- PhysicsIEEE Transactions on Magnetics
- 2005
Exchange coupled composite (ECC) media has been shown to possess several major advantages relative to conventional perpendicular media, including a reduction in the switching field of approximately a…
Optimization of exchange spring perpendicular recording media
- PhysicsIEEE Transactions on Magnetics
- 2005
Exchange spring media are proposed for magnetic-recording systems consisting of a hard/soft bilayer. By varying the fraction of thickness for the hard and soft layer and by varying their saturation…
Exchange spring media for perpendicular recording
- Materials Science
- 2005
A novel type of exchange spring media is proposed for magnetic recording systems consisting of a hard/soft bilayer. Finite element micromagnetic simulations show that the reversal modes induced by…
Optimization of perpendicular recording on exchange coupled composite media
- Engineering
- 2008
Using micromagnetic modeling, the recording performance of exchange coupled composite (ECC) media with perpendicular heads was systematically studied. The simulations indicated that the switching…
Exchange Coupled Composite Media
- EngineeringProceedings of the IEEE
- 2008
This paper reviews the recent work on composite media including two spin and complete micromagnetic models for ECC media, exchange spring media, synthetic antiferromagnet E CC media, and experimental results in support of these theories.
Relationship between composite and imperfect materials in perpendicular recording media (invited)
- Physics
- 2008
It is common to model recording media as interacting coherently rotating magnetic moments, but real materials frequently exhibit perpendicular switching fields less than the anisotropy field and a…
Domain wall assisted magnetic recording (invited)
- Materials Science
- 2007
The domain wall assisted switching in the hard/soft composite nanostructures is studied using numerical and analytic micromagnetics. The switching occurs via domain wall nucleation, compression in…
Patterned media with composite in-plane and perpendicular anisotropy recording layers
- Materials Science
- 2009
Exchange coupled composite media for perpendicular recording
- PhysicsINTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.
- 2005
For conventional perpendicular recording media of saturation magnetization M/sub S/ and grain volume V, the ratio of the stabilizing energy barrier /spl Delta/E to the switching field H/sub S/ is…
References
SHOWING 1-9 OF 9 REFERENCES
Areal density limits for perpendicular magnetic recording
- Physics
- 2002
Summary form only given. It is becoming clear that conventional longitudinal magnetic recording is approaching the superparamagnetic limit and that further density increases must be achieved using an…
Dynamic coercivity measurements of antiferromagnetically coupled magnetic media layers
- Geology
- 2001
We have performed dynamic coercivity measurements on a series of antiferromagnetically coupled (AFC) magnetic recording media utilizing a static write/read tester. The samples consist of two magnetic…
Magnetic recording configuration for densities beyond 1 Tb/in/sup 2/ and data rates beyond 1 Gb/s
- Geology
- 2002
A new magnetic recording system is evaluated that includes the single-pole head, a new medium design, and the soft underlayer of perpendicular recording. The proposed medium consists of perpendicular…
Improved thermal stability of synthetic ferrimagnetic media with enhanced exchange coupling strength
- Materials Science
- 2002
The effect of the antiferromagnetic interlayer exchange coupling strength J between the initial or stabilization magnetic layer L1 and the top magnetic layer L2 on the thermal stability of synthetic…
Approaches to tilted magnetic recording for extremely high areal density
- Geology
- 2003
In this paper, we systematically present our fundamental understanding of the advantages of tilted magnetic recording. We investigate the various configurations of tilted magnetic recording including…
Unshielded perpendicular recording head for 1 Tb/in/sup 2/
- PhysicsIEEE Transactions on Magnetics
- 2004
A full three-dimensional (3-D) self-consistent micromagnetic code has been employed to design an unshielded perpendicular writer for an areal density of 1 Tb/in/sup 2/. The head consists of a…
Antiferromagnetically coupled perpendicular recording media
- PhysicsDigest of INTERMAG 2003. International Magnetics Conference (Cat. No.03CH37401)
- 2003
In this paper, we will analyse the stabilization mechanism of antiferromagnetically coupled perpendicular (AFCP) media by calculating the effective energy barrier for the magnetization reversal of…
Analysis of transition shape and adjacent track aging for 1 Tb/in/sup 2/ write head designs
- EngineeringIEEE Transactions on Magnetics
- 2004
This paper analyzes the write field profiles for perpendicular head designs that have been proposed for reaching 1 Tb/in/sup 2/. Designs considered include side shielded poles and high anisotropy…
One terabit per square inch perpendicular recording conceptual design
- Physics
- 2002
Analysis based on the use of a high-gradient shielded pole write head indicates that a one terabit per square inch perpendicular recording system can be realized. System features include the…