Search Results - "Gislason, H. P."

Vacancy defect-induced d0 ferromagnetism in undoped ZnO nanostructures: Controversial origin and challenges by Qi, B., Ólafsson, S., Gíslason, H.P.

“…ZnO-based dilute magnetic semiconductors have attracted great interest for their promising application potential in spintronics. Observation of…”
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Atomic-scale study of the amorphous-to-crystalline phase transition mechanism in GeTe thin films by Mantovan, R., Fallica, R., Mokhles Gerami, A., Mølholt, T. E., Wiemer, C., Longo, M., Gunnlaugsson, H. P., Johnston, K., Masenda, H., Naidoo, D., Ncube, M., Bharuth-Ram, K., Fanciulli, M., Gislason, H. P., Langouche, G., Ólafsson, S., Weyer, G.

“…The underlying mechanism driving the structural amorphous-to-crystalline transition in Group VI chalcogenides is still a matter of debate even in the simplest…”
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Paramagnetism in Mn/Fe implanted ZnO by Gunnlaugsson, H. P., Mølholt, T. E., Mantovan, R., Masenda, H., Naidoo, D., Dlamini, W. B., Sielemann, R., Bharuth-Ram, K., Weyer, G., Johnston, K., Langouche, G., Ólafsson, S., Gíslason, H. P., Kobayashi, Y., Yoshida, Y., Fanciulli, M.

“…Prompted by the generally poor understanding of the nature of magnetic phenomena in 3 d -metal doped ZnO, we have undertaken on-line F 57 e Mössbauer…”
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Vacancy defects as compensating centers in Mg-doped GaN by Hautakangas, S, Oila, J, Alatalo, M, Saarinen, K, Liszkay, L, Seghier, D, Gislason, H P

“…We apply positron annihilation spectroscopy to identify V(N)-Mg(Ga) complexes as native defects in Mg-doped GaN. These defects dissociate in postgrowth…”
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Effects of cobalt doping on the electrical properties of MBE-grown ZnO by Seghier, D., Gislason, H. P.

“…We investigated n-conducting Co-doped ZnO epilayers grown by MBE with a cobalt content of nominal 4, 12, and 18 at.% by means of deep level transient…”
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Formation and nitridation of InGa composite droplets on Si(111): In-situ study by high resolution X-ray photoelectron spectroscopy by QI, B, SHAYESTEHAMINZADEH, S, OLAFSSON, S, GÖTHELID, M, GISLASON, H. P

“…We demonstrate applying synchrotron radiation based high resolution X-ray photoelectron spectroscopy as a versatile in-situ tool to study the step-wise…”
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Room temperature deposition of self-assembled Al nanoclusters on stepped sapphire (0001) surface and subsequent nitridation by Qi, B., Agnarsson, B., Ólafsson, S., Gíslason, H.P., Göthelid, M.

“…Self-assembled growth and nitridation of ultrathin Al nanoclusters on a stepped sapphire (0001) surface were studied by high-resolution X-ray photoemission…”
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Lattice locations and properties of Fe in Co/Fe co-implanted ZnO by Gunnlaugsson, H. P., Johnston, K., Mølholt, T. E., Weyer, G., Mantovan, R., Masenda, H., Naidoo, D., Ólafsson, S., Bharuth-Ram, K., Gíslason, H. P., Langouche, G., Madsen, M. B., the ISOLDE Collaboration

“…The lattice locations and electronic configurations of Fe in 57 Co/ 57 Fe implanted ZnO (to (5-6)×10 14 Fe/cm −2 ) have been studied by 57 Fe Mössbauer…”
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Shallow and deep donors in n-type ZnO characterized by admittance spectroscopy by Seghier, D., Gislason, H. P.

“…Shallow and deep energy levels in n-type ZnO materials grown by a pulsed laser injection method are investigated. We report thermal ionization energies for…”
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The effect of hard nitridation on Al2O3 using a radio frequency operated plasma cell by AGNARSSON, B, QI, B, GÖTHELID, M, OLAFSSON, S, GISLASON, H. P

“…We report on an atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) investigation of hard nitridation of sapphire ( alpha -Al2O3)…”
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Frequency-dependent conductivity in lithium-diffused and annealed GaAs by Gudmundsson, J.T., Svavarsson, H.G., Gudjonsson, S., Gislason, H.P.

“…We report on measurements of the frequency-dependent conductivity in lithium-diffused (Li-diffused) and annealed GaAs in the frequency range 10–106Hz and the…”
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Local increase of the Curie temperature in Mn/Fe implanted Y3Fe5O12 (YIG) by Krastev, P.B., Gunnlaugsson, H.P., Nomura, K., Bharuth-Ram, K., Qi, B., Masenda, H., Mølholt, T.E., Naidoo, D., Ólafsson, S., Martín-Luengo, A. Tarazaga, Unzueta, I., Johnston, K., Schell, J., Gislason, H.P.

“…The change in the Curie temperature of single crystalline garnet Y3Fe5O12 (YIG) sample due to lattice damage induced by ion implantation has been investigated…”
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Ferromagnetism and point defects in ZnCoO by Seghier, D, Gislason, H P

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Epitaxial (100)-oriented Mo/V superlattice grown on MgO(100) by dcMS and HiPIMS by Shayestehaminzadeh, S., Magnusson, R.L., Gislason, H.P., Olafsson, S.

“…Epitaxial (100)-oriented Mo/V superlattices have been grown by High Power Impulse Magnetron Sputtering (HiPIMS) and dc Magnetron Sputtering (dcMS) on…”
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Gallium and nitrogen vacancies in GaN: Impurity decoration effects by Hautakangas, S., Ranki, V., Makkonen, I., Puska, M.J., Saarinen, K., Liszkay, L., Seghier, D., Gislason, H.P., Freitas, Jr, J.A., Henry, R.L., Xu, X., Look, D.C.

“…We have performed a systematic study of magnesium and oxygen doping as well as the effect of annealing in metal organic chemical vapor deposition (MOCVD) and…”
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Influence of biaxial strain on thermodynamical properties of hydrogen in (001) oriented Mo/V superlattices by Reynaldsson, G., Olafsson, S., Gislason, H.P.

“…The influence of the strain state on the thermodynamics of hydrogen in quasi-two-dimensional V layers embedded in three Mo/V superlattices is reported in the…”
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Photoemission and low energy electron microscopy study on the formation and nitridation of indium droplets on Si (111)7×7 surfaces by Qi, B., Ólafsson, S., Göthelid, M., Gislason, H.P., Agnarsson, B.

“…The formation and nitridation of indium (In) droplets on Si (111)7×7, with regard to In droplet epitaxy growth of InN nanostructures, were studied using a…”
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Noise spectroscopy of metastable deep level centers in Mg-doped GaN by Seghier, D., Gislason, H.P.

“…We present results from noise spectroscopy performed on p-type GaN:Mg samples. In addition to the 1/f noise, significant generation–recombination noise is…”
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Hydrogen interactions in ultrathin two-dimensional vanadium layers by Reynaldsson, G., Olafsson, S., Gislason, H.P., Song, G., Zabel, H.

“…Resistance and expansion measurements on hydrogen uptake in asymmetric 8/4 unit cells Mo/V superlattice is presented. From the measurements, two independent…”
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On intrinsic defects in Co-doped ZnO thin films by Seghier, D, Gislason, H P

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