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X-ray magnetic circular dichroism characterization of GaN/Ga1-xMnxN digital ferromagnetic heterostructure.
- Source :
- Applied Physics Letters; 8/13/2007, Vol. 91 Issue 7, p072507, 3p, 3 Graphs
- Publication Year :
- 2007
-
Abstract
- The authors have investigated the magnetic properties of a GaN/Ga<subscript>1-x</subscript>Mn<subscript>x</subscript>N (x=0.1) digital ferromagnetic heterostructure (DFH) showing ferromagnetic behavior using soft x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). The Mn L<subscript>2,3</subscript>-edge XAS spectra were similar to those of Ga<subscript>1-x</subscript>Mn<subscript>x</subscript>N random alloy thin films, indicating a substitutional doping of high concentration Mn into GaN. From the XMCD measurements, it was revealed that paramagnetic and ferromagnetic Mn atoms coexisted in the Ga<subscript>1-x</subscript>Mn<subscript>x</subscript>N digital layers. Subtle differences were also found from the XMCD spectra between the electronic states of the ferromagnetic and paramagnetic Mn<superscript>2+</superscript> ions. The ferromagnetic moment per Mn atom estimated from XMCD agreed well with that estimated from superconducting quantum interference device measurements, indicating that the ferromagnetic behavior of the GaN/Ga<subscript>1-x</subscript>Mn<subscript>x</subscript>N DFH sample arises only from substitutional Mn<superscript>2+</superscript> ions in the Ga<subscript>1-x</subscript>Mn<subscript>x</subscript>N digital layers and not from ferromagnetic precipitates. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 91
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 26370012
- Full Text :
- https://doi.org/10.1063/1.2769944