Geislavirkar veilur í hálfleiðurum - verkefnislok

Fréttatilkynning verkefnisstjóra

3.2.2015

So far the project has resulted in 17 international ISI publications and numerous conference presentations.

Prof. Hafliði Pétur Gislason and Research Scientist Sveinn Ólafsson have been participating in the Mössbauer collaboration at ISOLDE/CERN since 2006 together with Research Scientist Harlaldur Páll Gunnlaugsson at Aarhus University. The collaboration is an increasing international group of more than 20 researchers active in using the radioactive isotopes produced at ISOLDE/CERN for emission Mössbauer spectroscopy. 

Heiti verkefnis: Geislavirkar veilur í hálfleiðurum/Radioactive defects in advanced semiconductors
Verkefnisstjóri: Hafliði Pétur Gíslason, Raunvísindastofnun Háskólans
Tegund styrks: Verkefnisstyrkur
Styrkár: 2011-2013
Fjárhæð styrks: 18,22 millj. kr.
Tilvísunarnúmer Rannís: 110017 

For the period 2010-2014, 15 shifts were awarded to the collaboration for the proposal entitled “Emission Mössbauer spectroscopy of advanced materials for opto-and nano- electronics”, for investigations on (1) Paramagnetic relaxations in compound semiconductors  and (2) Vacancy diffusion in group IV semiconductors.

Further 25 shifts for available research work for the next four years 2014-2018 were awarded in 2014. The ISOLDE collaboration has until now used around 6-7 shifts every year for beam time use. Participation in the Mössbauer collaboration at ISOLDE/CERN. One PhD student in our group, Torben E. Mølholt, participated in the collaboration from 2009 until October 2012 when he graduated from the University of Iceland.

i) The goals of the project include achieving the following for the (AlGa)N system:

• Make detailed mapping of defect stability/evolution in (Al,Ga)N:Mn.
• Make structural assignments to spectral components, possibly/likely assisted by theoretical calculations.
• Identify the magnetic structure in (Al,Ga)N:Mn (e.g. slow paramagnetism vs. ferromagnetism vs. fast spin relaxations)

ii) The use of 57Mn radioactive beams to study Mn based alloys is a new exploration which at least addresses the following scientific questions in this experiment

• The suitability of low fluence implantations for the study of Mn based alloys.
• Magnetic, structural, and electronic configurations of probe atoms.
• Kinetics of defect annealing.
• Role of defects in the observed magnetism.

So far the project has resulted in 17 international ISI publications and numerous conference presentations.









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