| The 18th International Symposium on Spin Physics |
October 6-11, 2008 University of Virginia Charlottesville, VA USA |
| First Name | Wenjing |
|---|---|
| Last Name | Yin |
| |
|
| Affiliation | University of Virginia |
| Co-Authors | Li He, Melissa Commisso Dolph, Jiwei Lu, Robert Hull and Stuart A. Wolf |
| Title | Diluted Magnetic Ge1-xMnx Thin Films and Quantum Dots Synthesized by Multiple Ion Implantation |
| Topic | Oral |
| Abstract of 200 words or less
Spin switching devices constructed using self-assembled magnetic Ge quantum dots are the ultimate goal of this effort. We introduced 1.1 at.% of Mn ions into Ge thin films and 3 at.% Mn into Ge Quantum Dots by ion implantation in order to explore the ferromagnetism in Mn implanted Ge. A maximum saturation moment of 0.7 μB/Mn at 5 K was reached when the sample was annealed at 300 ˚C and the moment decreased with higher annealing temperatures. The ferromagnetism in Mn:Ge thin films disappeared at ~ 15 K. However, superparamagnetism has been observed at 1 T up to 200 K for the 300 ˚C annealed film and persisted to room temperature for the 400 ˚C annealed film. Mn implanted Ge Quantum Dots were also found to be ferromagnetic. |
|