From the new patent:
"An advantage of the present invention is that it allows an increase in recording density due to the improved system signal to noise ratio and reduced intersymbol interference. This reduced intersymbol interference is a result of the reduced recorded transition length and the narrowing of the flux through the saturated region of the keeper layer.
According to another aspect of the invention, saturation of the keeper layer is effected in a manner that allows flux from only one recorded transition to couple to the head during a read operation. Therefore, substantially all the flux from the adjacent recorded transitions is shunted by the unsaturated portions of the keeper layer. This reduces the intersymbol interference from recorded transitions other than the one being read and increases the data capacity of keepered versus non-keepered media."
After a brief read of the new patent it looks to me that they've manages to tweek KM quite a bit!
"Therefore, substantially all the flux from the adjacent recorded transitions is shunted by the unsaturated portions of the keeper layer."
This seems to be a much more definitive statement than previous patents that merely claimed to reduce signal noise. They also have found that they can make the keeper layer thinner without loosing effectiveness. I'm trying not to get very interested here, but …. Well, we all know the ramifications of any significant KM licensing down the road. Can't help but dream.
BTW, sorry Gus, you are out there! I skipped over a couple of posts when I responded and missed yours. Is perpendicular recording the next stop on the density train? How about Colossal MR? I haven't kept up with things at all over the last year. Way to busy with my own business. Maybe I'll start digging again.
webster.aip.org
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The 43rd Annual Conference on Magnetism and Magnetic Materials (MMM) will be held at the Hotel InterContinental in Miami, Florida, from Monday, November 9, through Thursday, November 12, 1998. Members of the international scientific and engineering communities interested in recent developments in magnetism and associated technologies are invited to attend the Conference and contribute to its technical sessions.
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From last Monday's program:
Session BA
GMR: FUNDAMENTALS II
Stuart S.P. Parkin, Chair
IBM Almaden Research Center, 650 Harry Road, San Jose, CA 96120-6099
2:00
BA-01. TEST OF UNIFIED PICTURE OF SPIN DEPENDENT TRANSPORT IN PERPENDICULAR(CPP) GIANT MAGNETORESISTANCE AND BULK ALLOYS. W. Park, R. Loloee, W. P. Pratt, Jr., P. A. Schroeder, J. Bass (Michigan State Univ., Phys. and Astron., Ctr. for Fundamental Mater. Res., and NSF MRSEC Ctr. for Sensor Mater., East Lansing, MI, 48823-1116, US), and A. Fert (Unite Mixte de Recherche CNRS-Thomson, LCR, Domaine de Corrbevill, Orsay, 91 404, FR)
2:12
BA-02. PERPENDICULAR MAGNETORESISTANCE OF MICROSTRUCTURED Fe-Cr MULTILAYERS. Marie-Claire Cyrille, Sihong Kim, and Ivan K. Schuller (Univ. of California-San Diego, Phys. department, 9500 Gilman dr, La Jolla, CA, 92093-0319, US)
2:24
BA-03. ANGULAR VARIATION OF CURRENT-PERPENDICULAR-TO-PLANE (CPP) GIANT MAGNETORESISTANCE IN SPIN-VALVES. L. Giacomoni, B. Dieny (CEA/Grenoble, Recherche Fondamentale sur la Matiere Condensee, 38054, Grenoble, Cedex 09, FR), W. P. Pratt, Jr. (Michigan State Univ., Phys. and Astron., Ctr. for Fundamental Mater. Res., and NSF MRSEC Ctr. for Sensor Mater., East Lansing, MI, 48824-1116, US), A. Vedyayev, and N. Ryzhanova (Moscow Lomonosov Univ., Phys., Moscow, 119699, RU)
2:36
BA-04. PERPENDICULAR-TO-THE-PLANE GIANT MAGNETORESISTANCE OF ANTIFERROMAGNETICALLY COUPLED (NiFe/Cu) MULTILAYERS WITH INTERFACIAL DUSTING. Laurence Giacomoni, Bernard Dieny (CEA/Grenoble, DRFMC, SP2M/NM, Grenoble Cedex 9, France, 38054, FR), Phillipe Gandit, and Jacques Chaussy (CNRS, CRTBT, Ave. des Martyrs, Grenoble Cedex 9, France, 38042, FR)
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I guess perpendicular recording is still on track… Lots to brush up on.
Regards,
Sean |
