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Observation of giant magnetoresistance due to open orbits in hybrid semiconductor/ferromagnet devices

A. Nogaret, S. Carlton, B. L. Gallagher, P. C. Main, M. Henini, R. Wirtz, R. Newbury, M. A. Howson, and S. P. Beaumont
Phys. Rev. B 55, R16037(R) – Published 15 June 1997
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Abstract

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.

  • Received 10 February 1997

DOI:https://doi.org/10.1103/PhysRevB.55.R16037

©1997 American Physical Society

Authors & Affiliations

A. Nogaret, S. Carlton, B. L. Gallagher, P. C. Main, and M. Henini

  • Department of Physics, University of Nottingham, Nottingham NG7 2RD, United Kingdom

R. Wirtz and R. Newbury

  • School of Physics, University of New South Wales, Sydney, NSW 2052, Australia

M. A. Howson

  • Department of Physics, University of Leeds, Leeds LS9 2JT, United Kingdom

S. P. Beaumont

  • Department of Electrical Engineering, Glasgow University, Glasgow G12 8QQ, United Kingdom

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Issue

Vol. 55, Iss. 24 — 15 June 1997

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