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November 15, 2007

Mtg: Patterned Nanomagnetic Bits and Devices for Higher Areal Density

by @ 9:06 pm. Filed under ALL, Communications, Computers/Software, Electronics Design, Engineering Mgmt, NanoEngineering, Optics/Displays, Semiconductors

TUESDAY February 12
SCV Magnetics Chapter
Speaker: Bruce D. Terris, Hitachi Global Storage Technologies, and 2008 IEEE Magnetics Society Distinguished Lecturer
Time: Cookies & Conversation at 7:30 PM, Presentation at 8:00 PM
Cost: none
Place: WDC (formerly Komag), 1710 Automation Parkway, San Jose
RSVP: not required

As conventional magnetic recording technology extends to ever higher areal density, it is possible the often predicted, and constantly increasing, density limit will be reached. ? This limit will likely be in the range of 750 – 1000 Gb/in2. The use of nano-fabrication to create patterned magnetic elements, or patterned media, is one of the proposed approaches with the promise of delaying the onset of superparamagnetism and thus enabling higher areal density. ? I will discuss many of the challenges that must be overcome for patterned media to be successful, including fundamental physics and material science issues, new fabrication technologies, nm-scale manufacturing tolerances, and low cost budgets.

One of these challenges is to controllably reverse one magnetic element, or bit, without affecting the neighboring elements. ? A narrow anisotropy distribution will be required, yet data suggest that as the element size shrinks, the distribution widens.? This distribution arises from a number of sources, including shape and size distributions, edge effects, variations in the full film anisotropy and magnetostatic fields from neighboring elements. ? As will be discussed, understanding and controlling the switching properties of magnetic nanostructures is critical not only for patterned media, but for device applications such as MRAM cells and spintronic devices and, for current induced as well as field induced reversal.

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