Magnetoresistance oscillations due to internal Landau band structure of a two-dimensional electron system in a periodic magnetic field

Abstract

We report alternative types of magnetoresistance oscillations in high mobility two-dimensional electron systems subjected to large amplitude one-dimensional periodic magnetic modulations, of period 500 nm to 1 m. We observe Shubnikov-de Haas oscillations that are strongly modified in amplitude and phase, Hall resistance oscillations, and aperiodic magnetoresistance oscillations. These effects are shown to arise from the internal structure of overlapping Landau bands and are well accounted for by perturbation calculations.

Giant magnetoresistance effect in nanostructures consisting of magnetic–electric barriers

“…Nogaret et al [4] demonstrated a GMR effect in this kind of nanosystems at low temperature, and a GMR ratio of up to 10 3 % at 4 K has been observed recently [5]. It was also reported that GMR oscillations, due to the internal Landau band structure of a 2DEG system, can be observed in a periodic magnetic field [6]. In addition, it is widely agreed that the spin-dependent scattering of electrons leads to different values of the conductances in the two configurations.…”

The magnetoresistance effect in a nanostructure with the periodic magnetic barriers

“…The magnetic field is created by the deposition, on top of the heterostructure, of two parallel metallic ferromagnetic strips. This has been investigated in detail by several authors [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Two-dimensional electrons in periodic magnetic fields: Finite-differences method study

“…Ibrahim and Peeters 4 and Krakovsky 5 investigated the electronic band structures by modeling the magnetic field using a simple exactly solvable model. The quantum transport properties of two-dimensional electrons under a periodic magnetic field have also been widely researched [9][10][11][12][13] and the theoretical works related to magnetoresistance and oscillations 14,15 have been predicted by assuming a sinusoidal magnetic field modulation of the 2DEG.…”