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Magnetic properties of Cu-doped GaN grown by molecular beam epitaxy

Ganz, Philipp R.; Fischer, Gerda; Sürgers, Christoph; Schaadt, Daniel M.

Cu-doped GaN films were epitaxially grown by molecular beam epitaxy on C-plane sapphire substrates with an AlN buffer layer. Growth under metal-rich and nitrogen-rich conditions was investigated for different Cu-to-Ga beam-equivalent-pressure ratios x BEP. The samples were characterized by scanning electron microscopy, energy dispersive x-ray spectroscopy, and x-ray diffraction. Films within a narrow range of x BEP around 1% exhibit ferromagnetic behavior with a Curie temperature higher than 400 K. For higher x BEP1%, islands of a Cu-Ga compound are predominantly formed at the surface as nonferromagnetic precipitates. Our detailed study shows that the saturation magnetization of ferromagnetic films with x BEP 1% decreases with increasing film thickness. This suggests that the ferromagnetism arises from defects, such as threading dislocations, created by the incorporation of Cu into the GaN.

DOI: 10.1103/PhysRevB.85.165204
Zitationen: 8
Web of Science
Zitationen: 8
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2012
Sprache Englisch
Identifikator ISSN: 1098-0121
KITopen-ID: 1000050401
Erschienen in Physical Review B - Condensed Matter and Materials Physics
Verlag American Physical Society (APS)
Band 85
Heft 16
Seiten Art.-Nr. 165204
Nachgewiesen in Scopus
Web of Science
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