Magnetoresistance (MR) measurements were performed on Ga 1-xMnxAs (x = 0.03) additionally doped with Be. At low temperatures and in low magnetic fields, a positive MR signal was observed for measurements in the transverse (B ⊥ 1) geometry. However, at high temperatures, the MR becomes negative for all fields and all field orientations. The value of the negative MR has a maximum near the Curie temperature, and its magnitude depends strongly on the concentration of free holes. The observed MR behavior can be described by the magnetoimpurity scattering model in both the paramagnetic and the ferromagnetic temperature regions. Quantitative analysis of the Ga1-xMnxAs MR data yields the value of the p-d exchange energy as |N0β| ≈ 1.6eV.
|Number of pages||4|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Publication status||Published - 2003 Oct|
- P-d exchange energy
ASJC Scopus subject areas
- Physics and Astronomy(all)