Relevant characteristics of undoped GaMnN grown by using molecular beam epitaxy

Title
Relevant characteristics of undoped GaMnN grown by using molecular beam epitaxy
Authors
김은규
Keywords
GaMnN; Ferromagnetic semiconductor; Molecular beam epitaxy; Electron Spin Resonance
Issue Date
2015-08
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v. 67, NO 3, Page. 541-546
Abstract
GaN:Mn epilayers were grown on Al2O3 substrate by using molecular beam epitaxy (MBE). Xray diffraction (XRD) data showed intrinsic GaMnN and precipitates including MnGa and MnN. PL transitions (e, Mn) and (D, Mn) related to Mn were remarkably activated. Clear ferromagnetic hysteresis loops were obtained in both samples, which means a good formation of ferromagnetic coupling. The M-T curves revealed a curie temperature (T (c) ) of 140 similar to 170 K which is intrinsic to GaMnN and a Tc of above 300 K which is due to the MnGa and the MnN precipitates. The samples clearly displayed a magnetic resonance at a field of around 200 - 400 mT. Electron spin resonance (ESR) data showed that the shift of (H (center) ) (i.e., H (center) = 337 - H (center) [mT]) were greater than 20 mT for samples, and the appearance of a Hcenter with a positive H (center) is indicative of the samples having obvious ferromagnetism. The incorporated Mn ions are in a 2+ ionic state (i.e., Mn2+) because Mn2+ with a spin state of S = 5/2 typically exhibits a magnetic resonance with g a parts per thousand 2 when Mn is doped into semiconductors.
URI
https://link.springer.com/article/10.3938/jkps.67.541http://hdl.handle.net/20.500.11754/26864
ISSN
0374-4884; 1976-8524
DOI
http://dx.doi.org/10.3938/jkps.67.541
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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