Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Ulrich Merkt"'
Publikováno v:
Journal of Crystal Growth. 311:79-84
Thin films of the Heusler alloy Ni 2 MnIn are deposited at substrate temperatures between 50 and 300 ∘ C on a variety of substrates by coevaporation of Ni and the alloy MnIn. The morphology and crystal structure of films grown on amorphous carbon f
Publikováno v:
Superlattices and Microstructures. 37:349-352
In spintronic devices the spin of the electron as well as its charge is utilized. We have fabricated a spin-valve device consisting of two permalloy electrodes which are connected by a normal-metal strip made of aluminum. By changing the relative ali
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 24:124-128
Fringe-field-induced local Hall magnetometry is applied to investigate microstructured NiFe rings. The semiconductor-based technique yields a high detection sensitivity of magnetic stray fields. This allows an accurate measurement of different magnet
Publikováno v:
Superconductor Science and Technology. 16:1470-1474
We present investigations of Shapiro steps in ballistic Nb/InAs(2DES)/Nb (SNS) Josephson junctions. Since the standard RCSJ model developed for tunnel junctions does not fit our data, we have extended it taking into account a voltage-dependent excess
Autor:
Ulrich Merkt
Publikováno v:
Superlattices and Microstructures. 33:357-367
A brief account of our recent work on InAs/metal hybrids is given. In particular we discuss Josephson field-effect transistors with niobium source and drain contacts, first spin transistor structures with permalloy electrodes, and devices with gold s
Publikováno v:
Semiconductor Science and Technology. 18:434-441
We present simulations of potential landscapes for electrons in random and correlated distributions of repulsive scatterers, which enable the determination of percolation thresholds, densities of states and oscillator strengths. These simulations elu
Publikováno v:
physica status solidi (b). 233:436-444
We have performed low temperature magnetoresistance measurements of the two-dimensional electron system (2DES) in an inversion layer on p-type InAs. In high magnetic fields perpendicular to the 2DES beating patterns in Shubnikov-de Haas oscillations
Publikováno v:
Physica C: Superconductivity. :27-30
Using an RF-SQUID configuration we have measured the temperature dependence of the current–phase relation (CPR) of Nb/InAs(2DEG)/Nb (two-dimensional electron gas, 2DEG) Josephson junctions with high interface transparency. At low temperatures, sign
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 13:577-581
Magnetoconductance across permalloy/InAs(2DES)/permalloy double junctions in the ballistic limit is examined within the transfer-matrix formalism. We take into account Rashba spin–orbit interaction in the semiconductor as well as oblique modes in d
Autor:
Toru Matsuyama, Detlef Heitmann, J. Nitta, Ane Jensen, Hideaki Takayanagi, Jørn Hansen, C. M. Hu, Ulrich Merkt
Publikováno v:
Hu, C M, Nitta, J, Jensen, A, Hansen, J B, Takayanagi, H, Matsuyama, T, Heitmann, D & Merkt, U 2002, ' Spin injection across a hybrid heterojunction: Theoretical understanding and experimental approach (invited) ', Journal of Applied Physics, vol. 91, no. 10, pp. 7251-7255 . https://doi.org/10.1063/1.1447282
Spin injection across a hybrid ferromagnet/semiconductor junction has proven to be difficult, unlike in an all-metal junction used in giant magnetoresistance devices. The difference responsible is highlighted in a simple model. We perform spin-inject