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- W2055219418 abstract "We have investigated NbN-DyN-NbN junctions with 1 to 10 nm thick DyN barriers. A crossover from diffusive (hopping) to tunneling-type transport was found in these junctions as the DyN thickness is reduced below $ensuremath{sim}$4 nm. We have also made a detailed study of magnetic and electrical properties of thicker DyN thin films deposited under similar conditions; DyN films were found to be ferromagnetic with ${T}_{text{Curie}}ensuremath{sim}35ifmmodepmelsetextpmfi{}5$ K. Electrical transport of the junctions with $ensuremath{sim}$10 nm DyN was understood in terms of Shklovskii-Efros (SE)-type variable range hopping (VRH) at low temperature between 90 and 35 K. We estimated localization length $ensuremath{xi}=5.6$ nm in this temperature range. Temperature dependence of resistance was found to deviate from SE-VRH below 35 K along with large suppression of resistance with magnetic field. This is correlated with onset of magnetism below 35 K. Large butterfly-shaped MR up to $ensuremath{sim}$40$%$ was found for the $ensuremath{sim}$10 nm thick DyN junction at 2 K. In the tunneling regime, barrier height of the tunnel junction was estimated $ensuremath{sim}$50 meV from the Simmons model. Signatures of spin filtering was found in temperature dependence of resistance in tunnel junction with $ensuremath{sim}$3 nm thick DyN. Cooper pair tunneling in these junctions below ${T}_{C}$ ($ensuremath{sim}$10.8 K) of NbN was understood according to S-I-S tunneling current model. We found coherent tunneling of Cooper pairs through a $ensuremath{sim}$1 nm thick DyN tunnel barrier with critical current ${I}_{C}ensuremath{sim}12$ $ensuremath{mu}$A. The critical current also showed modulation with magnetic field." @default.
- W2055219418 created "2016-06-24" @default.
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- W2055219418 date "2014-03-19" @default.
- W2055219418 modified "2023-10-17" @default.
- W2055219418 title "Crossover from diffusive to tunneling regime in NbN/DyN/NbN ferromagnetic semiconductor tunnel junctions" @default.
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- W2055219418 doi "https://doi.org/10.1103/physrevb.89.094414" @default.
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