. . . couldn't have said it better myself: Thanks WinterKnight - Great Post
"A computer hard-disk reader that uses a GMR sensor is equivalent to a jet flying at a speed of 30,000 kmph, at a height of just one metre above the ground, and yet being able to see and catalogue every single blade of grass it passes over."
GMR involves structures consisting of very thin layers of different magnetic materials.
For this reason it can also be considered "one of the first real applications of the promising field of nanotechnology", the Royal Swedish Academy of Sciences said in a statement. Copyright 2007 bbcnews.uk