Ferromagnetic and Structural Properties of Mn-Implanted p-GaN
Abstract
High doses (10(exp 15) - 5 x 10(exp 16)/sq cm) of Mn(+) ions were implanted into p-GaN at ^ 350 deg C and annealed at 700 - 1000 deg C. At the high end of this dose range, platelet structures of Ga(x)Mn(1-x)N were formed. The presence of these regions correlated with ferromagnetic behavior in the samples up to ^ 250 K. At low doses, the implantation led to a buried band of defects at the end of the ion range. There is tremendous interest in structures involving the manipulation of the spin of the electron in addition to its charge for switching and memory devices with new functionality. Applications for these spintronic devices are envisioned in communications technology, data processing and storage and in photonics. It has been demonstrated in a number of semiconductors (including GaMnAs, InMnAs and ZnMnSe) that quantum spin states are quite robust and can be transported over very large distances (> 100 micrometer in some cases). The ferromagnetism in dilute magnetic III-V semiconductors is carrier-induced and is still far from completely understood. The Curie temperature (T(sub c)) in these materials is believed to be governed by the interaction between localized ferromagnetic clusters (bound magnetic polarons). Recent calculations suggest that wide bandgap semiconductors may have T(sub c) values well above those for GaMnAs (110 K) and InMnAs (< 35 K). In particular GaMnN with ^ 5 at.% Mn, and high hole concentrations is predicted to have a T(sub c) exceeding 300 K. At present, little is known about doping GaN with Mn, although some initial results have been published on n-type Ga(x)Mn(1-x)N single crystallites with paramagnetic behavior. In this paper, we report on the magnetic properties of p-GaN implanted with high doses (3-5 at.%) of Mn.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2001
- Accession Number
- ADP012280
Entities
People
- A. F. Hebard
- C. R. Abernathy
- M. E. Overberg
- N. Theodoropoulou
- S. J. Pearton
Organizations
- University of Florida