We have investigated the magnetoresistance of a heterostructure containing a near surface two-dimensional electron gas subject to a periodic magnetic field that alternates in sign. The field is produced by an array of submicrometer ferromagnets fabricated on the surface of the heterostructure. We observe a giant low-field magnetoresistance due to electrons propagating in open orbits along lines of zero magnetic field. We are able to account for the observed form and magnitude of this magnetoresistance in a semiclassical model.
|Number of pages||4|
|Journal||Physical Review B : Condensed Matter and Materials Physics|
|Publication status||Published - 15 Jun 1997|
Nogaret, A., Carlton, S., Gallagher, B., main, P., Henini, M., Wirtz, R., Newbury, R., Howson, MA., & beaumont, S. (1997). Observation of giant magnetoresistance due to open orbits in hybrid semiconductor/ferromagnet devices. Physical Review B : Condensed Matter and Materials Physics, 55, 16037-16040. https://doi.org/10.1103/PhysRevB.55.R16037