Anisotropic magnetoresistance in a 2DEG in a quasi-random magnetic field
A. W. Rushforth, B. L. Gallagher, P. C. Main, A. C. Neumann, M., Henini, C. H. Marrows, B. J. Hickey
TL;DR
This study investigates anisotropic magnetoresistance in a 2DEG influenced by a quasi-random magnetic field created by randomly placed Co dots, revealing how magnetic field topology guides electron paths.
Contribution
It demonstrates the impact of a quasi-random magnetic field on 2DEG magnetotransport and confirms electron guidance along zero-field contours through Monte-Carlo simulations.
Findings
Strong local and non-local anisotropic magnetoresistance observed.
Magnetoresistance linked to magnetic field topology and electron guidance.
Monte-Carlo calculations support the experimental observations.
Abstract
We present magnetotransport results for a 2D electron gas (2DEG) subject to the quasi-random magnetic field produced by randomly positioned sub-micron Co dots deposited onto the surface of a GaAs/AlGaAs heterostructure. We observe strong local and non-local anisotropic magnetoresistance for external magnetic fields in the plane of the 2DEG. Monte-Carlo calculations confirm that this is due to the changing topology of the quasi-random magnetic field in which electrons are guided predominantly along contours of zero magnetic field.
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