Search Results - "Koopmans, B."

Integrating all-optical switching with spintronics by Lalieu, M. L. M., Lavrijsen, R., Koopmans, B.

“…All-optical switching (AOS) of magnetic materials describes the reversal of the magnetization using short (femtosecond) laser pulses, and received extensive…”
Get full text

Field-free magnetization reversal by spin-Hall effect and exchange bias by van den Brink, A., Vermijs, G., Solignac, A., Koo, J., Kohlhepp, J. T., Swagten, H. J. M., Koopmans, B.

“…As the first magnetic random access memories are finding their way onto the market, an important issue remains to be solved: the current density required to…”
Get full text

Microscopic model for all optical switching in ferromagnets by Cornelissen, T. D., Córdoba, R., Koopmans, B.

“…The microscopic mechanism behind the all optical switching (AOS) in ferromagnets has triggered intense scientific debate. Here, the microscopic…”
Get full text

Explaining the paradoxical diversity of ultrafast laser-induced demagnetization by Cinchetti, M, Malinowski, G, Dalla Longa, F, Steiauf, D, Fähnle, M, Koopmans, B, Aeschlimann, M, Roth, T

“…Pulsed-laser-induced quenching of ferromagnetic order has intrigued researchers since pioneering works in the 1990s. It was reported that demagnetization in…”
Get full text

Comparing ultrafast demagnetization rates between competing models for finite temperature magnetism by Schellekens, A J, Koopmans, B

“…We investigate a recent controversy in ultrafast magnetization dynamics by comparing the demagnetization rates from two frequently used but competing…”
Get full text

Shift registers based on magnetic domain wall ratchets with perpendicular anisotropy by Franken, J. H., Swagten, H. J. M., Koopmans, B.

“…The movement of magnetic domain walls can be used to build a device known as a shift register, which has applications in memory 1 and logic circuits 2 , 3 …”
Get full text

Tunable chiral spin texture in magnetic domain-walls by Franken, J. H., Herps, M., Swagten, H. J. M., Koopmans, B.

“…Magnetic domain-walls (DWs) with a preferred chirality exhibit very efficient current-driven motion. Since structural inversion asymmetry (SIA) is required for…”
Get full text

Electric-field control of domain wall motion in perpendicularly magnetized materials by Schellekens, A.J., van den Brink, A., Franken, J.H., Swagten, H.J.M., Koopmans, B.

“…Domain wall motion in materials exhibiting perpendicular magnetic anisotropy has been the subject of intensive research because of its large potential for…”
Get full text

Domain wall depinning governed by the spin Hall effect by Haazen, P. P. J., Murè, E., Franken, J. H., Lavrijsen, R., Swagten, H. J. M., Koopmans, B.

“…The control and manipulation of domain walls in perpendicularly magnetized nanowires by means of an electric current has gained attention for possible device…”
Get full text

Separating positive and negative magnetoresistance in organic semiconductor devices by Bloom, F L, Wagemans, W, Kemerink, M, Koopmans, B

“…We study the transition between positive and negative organic magnetoresistance (OMAR) in tris-(8 hydroxyquinoline) aluminium (Alq_{3}), in order to identify…”
Get full text

Ultrafast spin-transfer torque driven by femtosecond pulsed-laser excitation by Schellekens, A. J., Kuiper, K. C., de Wit, R.R.J.C., Koopmans, B

“…Spin currents have an important role in many proposed spintronic devices, as they govern the switching process of magnetic bits in random access memories or…”
Get full text

Investigating the contribution of superdiffusive transport to ultrafast demagnetization of ferromagnetic thin films by Schellekens, A. J., Verhoeven, W., Vader, T. N., Koopmans, B.

“…We experimentally investigate to what extent superdiffusive spin transport contributes to the ultrafast demagnetization of ferromagnets by pumping Ni thin…”
Get full text

Spin-orbit enhanced demagnetization rate in Co/Pt-multilayers by Kuiper, K. C., Roth, T., Schellekens, A. J., Schmitt, O., Koopmans, B., Cinchetti, M., Aeschlimann, M.

“…In order to explore the role of enhanced spin-orbit interactions on the laser-induced ultrafast magnetization dynamics, we performed a comparative study on…”
Get full text

Bipolaron mechanism for organic magnetoresistance by Bobbert, P A, Nguyen, T D, van Oost, F W A, Koopmans, B, Wohlgenannt, M

“…We present a mechanism for the recently discovered magnetoresistance in disordered pi-conjugated materials, based on hopping of polarons and bipolaron…”
Get full text

Magnetic-field dependence of the electroluminescence of organic light-emitting diodes: a competition between exciton formation and spin mixing by Kersten, S P, Schellekens, A J, Koopmans, B, Bobbert, P A

“…We explore the magnetoelectroluminescence (MEL) of organic light-emitting diodes by evaluating the magnetic-field dependent fraction of singlet excitons…”
Get full text

Hot-Electron-Induced Ultrafast Demagnetization in Co/Pt Multilayers by Bergeard, N, Hehn, M, Mangin, S, Lengaigne, G, Montaigne, F, Lalieu, M L M, Koopmans, B, Malinowski, G

“…Using specially engineered structures to tailor the optical absorption in a metallic multilayer, we analyze the magnetization dynamics of a Co/Pt multilayer…”
Get full text

Tuning organic magnetoresistance in polymer-fullerene blends by controlling spin reaction pathways by Janssen, P., Cox, M., Wouters, S.H.W., Kemerink, M., Wienk, M.M., Koopmans, B.

“…Harnessing the spin degree of freedom in semiconductors is generally a challenging, yet rewarding task. In recent years, the large effect of a small magnetic…”
Get full text

Spin-Hall-assisted magnetic random access memory by van den Brink, A., Cosemans, S., Cornelissen, S., Manfrini, M., Vaysset, A., Van Roy, W., Min, T., Swagten, H. J. M., Koopmans, B.

“…We propose a write scheme for perpendicular spin-transfer torque magnetoresistive random-access memory that significantly reduces the required tunnel current…”
Get full text

Visible-light-promoted gas-phase water splitting using porous WO3/BiVO4 photoanodes by Stoll, T., Zafeiropoulos, G., Dogan, I., Genuit, H., Lavrijsen, R., Koopmans, B., Tsampas, M.N.

“…We recently described the use of Ti(0) microfibers as an anodization substrate for the preparation of TiO2 nanotubes arrays as porous photoanodes. Here, we…”
Get full text

Asymmetric magnetic bubble expansion under in-plane field in Pt/Co/Pt: Effect of interface engineering by Lavrijsen, R., Hartmann, D. M. F., van den Brink, A., Yin, Y., Barcones, B., Duine, R. A., Verheijen, M. A., Swagten, H. J. M., Koopmans, B.

“…We analyze the impact of growth conditions on the asymmetric magnetic bubble expansion under an in-plane field in ultrathin Pt/Co/Pt films. Specifically, using…”
Get full text