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.
headed by Matt Dugas, perfected batch microfabrication of Si probes, which are magnetically sensitized by sputter coating with a ferromagnetic film
p] are distributed and of the gap between the ferromagnetic film
and the bottom of the electromagnet magnetic core.
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.
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.