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Physical Review B - Condensed Matter and Materials Physics

Volumn 80, Issue 23, 2009, Pages

Electronic structures of Mn-induced phases on GaN(0001)

(4) Qi, Y a Sun, G F a Weinert, M a Li, L a

a UNIVERSITY OF WISCONSIN MILWAUKEE (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 77954736021 PISSN: 10980121 EISSN: 1550235X Source Type: Journal
DOI: 10.1103/PhysRevB.80.235323 Document Type: Article

Times cited : (16)

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- The Fe/W tip is modeled by an Fe pyramid on a three-layer c (4×4 ) W (110). The calculations indicate that the apex Fe atom gives a large enhancement of the magnetic moment (2.78 μB /atom ) compared to that of bulk Fe and to the Fe atoms directly in contact with W slab (2.1-2.3 μB /atom ). The enhancement of the magnetic moment of the topmost Fe atom is reminiscent of increased moments at surfaces and is due to a shift of the peaks in the DOS related to band narrowing. The minority spin channel has an especially sharp peak at 0.5 eV below EF. Tunneling of electrons between Mn-induced states and these localized states allows the imaging of the energy- and position-dependent density of states not accessible by a W tip. In addition, the spatially resolved DOS indicate these states have d character pointing out of the surface, which would further enhance the resolution.
- The Fe/W tip is modeled by an Fe pyramid on a three-layer c (4 × 4) W (110). The calculations indicate that the apex Fe atom gives a large enhancement of the magnetic moment (2.78 μ B / atom) compared to that of bulk Fe and to the Fe atoms directly in contact with W slab (2.1 - 2.3 μ B / atom). The enhancement of the magnetic moment of the topmost Fe atom is reminiscent of increased moments at surfaces and is due to a shift of the peaks in the DOS related to band narrowing. The minority spin channel has an especially sharp peak at 0.5 eV below E F. Tunneling of electrons between Mn-induced states and these localized states allows the imaging of the energy- and position-dependent density of states not accessible by a W tip. In addition, the spatially resolved DOS indicate these states have d character pointing out of the surface, which would further enhance the resolution.

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