In  a device, in which the sensor is realized as miniature electromagnet which is scanned by finger on the touch sensitive screen with a layer of ferromagnetic film
, is analyzed.
A magnetized ferromagnetic film is placed between the detectors which reflects the "up" spin component and allows the "down" spin component to pass.
Measurements of the detector count rate ratios with an Al substrate but without ferromagnetic film showed that the albedo effect is determinative.
Minneapolis-based Advanced Research Corp., headed by Matt Dugas, perfected batch microfabrication of Si probes, which are magnetically sensitized by sputter coating with a ferromagnetic film
The magnetic circuit is composed of electromagnet magnetic core with the mean length of magnetic line equal to [l.sub.m], of the part of miniature in which the magnetic lines with the mean length of magnetic lines equal to [l.sub.p] are distributed and of the gap between the ferromagnetic film
and the bottom of the electromagnet magnetic core.
The Brownian motion of the cantilever sensor fundamentally limits its ultimate sensitivity; at room temperature this corresponds to a 0.02 nm thick ferromagnetic film with the current cantilever geometry.
Work at NIST to develop ultra-sensitive magnetometers based on micromechanical sensors has led to a new instrument for in situ measurements of ferromagnetic films. In particular, measurements of thin-film properties critical to the development of read head sensors and magnetic recording media are being investigated.
It should be mentioned that the ferromagnetic films
were highly resistive; therefore, investigation of carrier concentration and type via Hall effect measurements was not possible.
Samwer, "Giant negative magnetoresistance in perovskite-like [La.sub.2/3][Ba.sub.1/3] Mn[O.sub.x] ferromagnetic films
" Physical Review Letters, vol.
For example, Patent 6280813, Magnetic Recording Media with Antiferromagnetically Coupled (AFC) Ferromagnetic Films
as the Recording Layer, is IBM's "pixie dust" patent.
The study of the magnetic coupling between two ferromagnetic films
separated by a non-ferromagnetic metallic spacer has been an extremely active and fruitful area of research over the last decade.