596 citations
- E. Lindfors5 profiles24 · h 69
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- L. Takalo19 · h 71
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8 papers · 1 filter
Initial oxidation of Fe-Al and Fe-Cr-Al alloys: Cr as an alumina booster
Markku Heinonen, Kalevi Kokko, Marko Punkkinen +3
The boosting effect of Cr on the growth of the protective alumina scale on Fe-Al alloys is investigated by x-ray photoelectron spectroscopy. Using low oxygen pressure the surface c…
Hysteretic magnetoresistance in polymeric diodes
Sayani Majumdar, Himadri S. Majumdar, Harri Aarnio +1
We report on hysteretic organic magnetoresistance (OMAR) in polymeric diodes. We found that magnitude and lineshape of OMAR depends strongly on the scan speed of the magnetic field…
Correlation between Organic Magnetoresistance (OMAR) and Ferromagnetic ordering
Sayani Majumdar, Himadri Majumdar, Jan-Olof Lill +3
We report observation of ferromagnetic (FM) ordering in organic semiconductors, namely regio-regular poly (3-hexyl thiophene) (RRP3HT) and 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6…
Towards printed magnetic sensors based on organic diodes
Sayani Majumdar, Himadri S. Majumdar, Daniel Tobjork +1
We report the study of magnetotransport properties of regio-regular poly (3-hexyl thiophene) based organic diodes. The devices were fabricated using two different techniques of spi…
The role of electron-hole recombination in organic magnetoresistance
Sayani Majumdar, Himadri S Majumdar, Harri Aarnio +3
Magneto-electrical measurements were performed on diodes and bulk heterojunction solar cells (BHSCs) to clarify the role of formation of coulombically bound electron-hole (e-h) pai…
Proving the Perdew-Burke-Ernzerhof density functional designed for metallic bulk and surface systems
M. Ropo, K. Kokko, L. Vitos
We test the accuracy of the revised Perdew-Burke-Ernzerhof exchange-correlation density functional (PBEsol) for metallic bulk and surface systems. It is shown that, on average, PBE…