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Your search keyword '"Farley, N.R.S."' showing total 8 results
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8 results on '"Farley, N.R.S."'

1. Mn L3,2 x-ray absorption from (Ga,Mn)As and (Ga,Mn)N

Author

Edmonds, K.W., Farley, N.R.S., Johal, T.K., Campion, R.P., Gallagher, B.L., Foxon, C.T., and van der Laan, G.

Subjects
Arsenic compounds -- Optical properties, Arsenic compounds -- Magnetic properties, Gallium compounds -- Optical properties, Gallium compounds -- Magnetic properties, Physics
Abstract

The Mn L3,2 x-ray absorption measurements from two dilute magnetic semiconductor systems,(Ga,Mn) As and (Ga,Mn)N are presented. The Mn L3,2 absorption from (Ga,Mn)N is characteristic of more localized Mn(super 2+) ions.

Published
2004

3. X-ray in-plane scattering investigation of GaN nanorods

Author

Horak, L., Holy, V., Staddon, C.R., Farley, N.R.S., Novikov, S.V., Campion, R.P., and Foxon, C.T.

Subjects
Diffraction -- Analysis, Gallium compounds -- Electric properties, Gallium compounds -- Structure, Nanotechnology -- Research, Physics
Abstract

The development of an x-ray method that used a grazing-incidence diffraction setup for the structural characterization of semiordered GaN nanorods is reported. The application of the method is demonstrated on a series of GaN nanorod samples to determine the mean size of the rods and their angular twist with respect to the crystalline substrate.

Published
2008

4. Molecular beam epitaxy grown (Ga,Mn)(As,P) with perpendicular to plane magnetic easy axis

Author

Rushforth, A.W., Wang, M., Farley, N.R.S., Campion, R.P., Edmonds, K.W., Staddon, C.R., Foxon, C.T., and Gallagher, B.L.

Subjects
Ferromagnetism -- Analysis, Gallium arsenide -- Magnetic properties, Gallium arsenide -- Electric properties, Gallium arsenide -- Structure, Manganese -- Magnetic properties, Manganese -- Electric properties, Molecular beams -- Usage, Physics
Abstract

The magnetic, electrical and structural properties of [Ga.sub.0.94][Mn.sub.0.06][As.sub.1-y][P.sub.y] layers grown by molecular beam epitaxy on GaAs substrates for y

Published
2008

5. Secondary magnetic phases in (Ga, Mn)As determined by x-ray magnetic circular dichroism

Author

Edmonds, K.W., Freeman, A.A., Farley, N.R.S., K.Y. Wang, Campion, R.P., Gallagher, B.L., Foxon, C.T., Laan, G. van der, and Arenholz, E.

Subjects
Critical point -- Analysis, Gallium compounds -- Structure, Gallium compounds -- Electric properties, Gallium compounds -- Magnetic properties, X-ray spectroscopy -- Analysis, Circular dichroism -- Analysis, Physics
Abstract

The study report on the magnetic and electronic properties of (Ga,Mn)As ferromagnetic semiconductor layers containing low concentrations of room temperature magnetic MnAs precipitates is presented.

Published
2007

6. Influence of the Mn interstitial on the magnetic and transport properties of (Ga, Mn)As

Author

K.Y. Wang, Edmonds, K.W., Campion, R.P., Gallagher, B.L., Farley, N.R.S., Foxon, C.T, Sawicki, M, Boguslawski, P., and Dietl, T.

Subjects
Gallium -- Magnetic properties, Gallium -- Thermal properties, Magnetization -- Analysis, Manganese -- Magnetic properties, Manganese -- Thermal properties, Physics
Abstract

The measurements of the hole density, ferromagnetic transition temperature Tc and magnetization in a series of as-grown and annealed (Ga,Mn) As samples are presented. On the assumption of an antiferromagnetic coupling between interstital and substitutional Mn, the estimated magnetic moment per Mn is found to be close to the expected 5muB.

Published
2004

7. Surface effects in Mn L3,2 x-ray absorption spectra from (Ga,Mn)As.

Author

Edmonds, K.W., Farley, N.R.S., Campion, R.P., Foxon, C.T., Gallagher, B.L., Johan, T.K., van der Laan, G., MacKenzie, M., Chapman, J.N., and Arenholz, E.

Subjects
*ABSORPTION spectra, *EXCITON theory, *MOLECULAR spectroscopy, *PHOTONS, *THIN films, *DICHROISM
Abstract

We have identified a Mn-rich layer on the surface on (Ga,Mn)As thin films which significantly influences soft x-ray absorption measurements. The Mn L3,3 x-ray absorption spectra of the untreated films show a strong multiplet structure, consistent with earlier observations and characteristic of MnO. After removal of the surface layer, the multiplet structure is less pronounced and the spectrum is shifted to ∼0.5 eV lower photon energy. Comparison with calculated spectra imply a localized Mn ground state for the untreated sample and a hybridized ground state after etching. In addition, a large x-ray magnetic circular dichroism is observed at the Mn L3,2 edge in the etched film. These results may explain several peculiarities of previously reported x-ray absorption studies from (Ga,Mn)As. [ABSTRACT FROM AUTHOR]

Published
2004
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