Monday, November 16, 1998
4:00 PM (refreshments 3:45)
Edgerton Hall, Room 34-101
EECS Colloquium
Abstract
The areal density of data on a hard disk has been increasing at 60% per annum for the last few years. However, at this rate of increase, thermal instability of the written data patterns will shortly become a serious problem. This is the "superparamagnetic limit," and occurs because the grains in the magnetic film are so small that they can reverse their magnetization spontaneously, leading to loss of recorded data.
In this seminar I will discuss how magnetic recording might evolve as this physical limit is approached. One scheme is to use "patterned media," in which each bit is defined lithographically and read using a magnetic head or magneto- optical probe tip. This requires magnetic features below 50 nm in size to be formed over large areas of substrate. Arrays of small magnetic features are also used in a magnetic RAM (MRAM), in which data are stored in magnetoresistive bits. I will describe the magnetic properties of arrays of particles fabricated using nanolithography, and show how they might be used in different types of storage devices.
|
Modified: Nov 5, 1998|
Current events|
Your comments
and inquiries are welcome.