Synthetic ferrimagnetic media

The thermal stability and read-write performance of longitudinal magnetic recording media with antiferromagnetically coupled layers were investigated. The thermal stability is strongly dependent on the interaction betweenlayers and the anisotropy energy of the stabilizing layer or layers. For media with two coupled layers, the energy barrier is increased by 30% to 80% of the anisotropy energy of the stabilizing layer, depending on the strength of the interaction. Although the total thickness is larger compared to a conventional medium with the same remanence magnetization and thickness product M r δ, the resolution is higher and depends on the difference in thickness between the layers. With these "synthetic ferrimagnetic" structures, thermally stable, low M r δ and high-resolution media are made possible with an areal density advantage of at least 1.75 times that of conventional longitudinal recording media.

[1]  Masaya Suzuki,et al.  Thermal Stability of Longitudinal Media for , 2000 .

[2]  B. Acharya,et al.  SNR improvements for advanced longitudinal recording media , 2001 .

[3]  E. Fullerton,et al.  Beyond 35 GBIT/IN/sup 2/: using a merged notched head on advanced thermally stable media , 2000 .

[4]  Effect Of CoCr Interlayer On Longitudinal Recording , 1997, 1997 IEEE International Magnetics Conference (INTERMAG'97).

[5]  Margaret Evans Best,et al.  Antiferromagnetically coupled magnetic media layers for thermally stable high-density recording , 2000 .

[6]  B. Acharya,et al.  Exchange coupling strength in synthetic ferrimagnetic media , 2001 .

[7]  B. Acharya,et al.  Contribution of the magnetic anisotropy of the stabilization layer to the thermal stability of synthetic ferrimagnetic media , 2002 .

[8]  Eric E. Fullerton,et al.  Dynamic coercivity measurements of antiferromagnetically coupled magnetic media layers , 2001 .

[9]  Y. Mizoshita,et al.  Longitudinal magnetic recording media wffh thermal stabilization , 2000 .

[10]  Kenji Ohta,et al.  New Magnetic Recording Method Using Laser Assisted Read/Write Technologies , 1999 .

[11]  Parkin,et al.  Systematic variation of the strength and oscillation period of indirect magnetic exchange coupling through the 3d, 4d, and 5d transition metals. , 1991, Physical review letters.

[12]  Y. Mizoshita,et al.  Longitudinal magnetic recording media with thermal stabilization layers , 2000 .

[13]  L. Néel.  Chapter XV Theoretical Remarks on Ferromagnetism at Low Temperatures , 1955 .

[14]  A. Moser,et al.  Thermal effect limits in ultrahigh-density magnetic recording , 1999 .