B. J. van Wees

University of Groningen

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T. M. Klapwijk

Delft University of Technology

I. J. Vera-Marun

University of Manchester

N. Tombros

University of Groningen

Marcos H. D. Guimarães

University of Groningen

C. H. van der Wal

University of Groningen

G. Bauer

Tohoku University

G. Borghs

IMEC

H. van Houten

Philips (Netherlands)

Alexey A. Kaverzin

The University of Tokyo

C. W. J. Beenakker

Leiden University

Cooperative Institutions

University of Groningen

200

Delft University of Technology

Centre National de la Recherche Scientifique

University of Cambridge

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Philips (Netherlands)

Leiden University

Tohoku University

Radboud University Nijmegen

Eindhoven University of Technology

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One-Way Optoelectronic Switching of Photochromic Molecules on Gold

Physical Review Letters (2003)

Diana Dulić Sense Jan van der Molen Tibor Kudernác Harry T. Jonkman Jaap J. D. de Jong

We investigate photochromic molecular switches that are self-assembled on gold. We use two experimental techniques; namely, the mechanically controllable break-junction technique to measure electronic transport, and UV/Vis spectroscopy to measure absorption. We observe switching of the molecules from the conducting to the insulating state when illuminated with visible light (lambda=546 nm), in spite of the gold surface plasmon absorption present around this wavelength. However, we fail to observe the reverse process which should occur upon illumination with UV light (lambda=313 nm). We attribute this to quenching of the excited state of the molecule in the open form by the presence of gold.

Visible spectrum

10.1103/physrevlett.91.207402

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Nonreciprocal transport of thermally generated magnons

Physical review. B./Physical review. B (2024)

Maxen Cosset‐Chéneau Sytze H. Tirion Xiangyang Wei J. Ben Youssef B. J. van Wees

We demonstrate the nonreciprocity of electrically and thermally generated incoherent magnon transport using the magnetization direction of a Py wire placed on top of an ultrathin YIG film. We show that the transport properties of thermally generated magnons under a Py wire depend on the relative orientation between the temperature gradient and the Py-magnetization direction. The symmetries of this nonreciprocal magnon transport match with those predicted by the remote dipolar interaction between YIG and Py magnons, controlled by the chirality of the YIG magnon dipolar stray fields. We also show that the directional magnon generation by the spin Seebeck effect from the Py wire displays the symmetries expected from the chiral spin Seebeck effect. Published by the American Physical Society 2024

Magnon

10.1103/physrevb.110.214418

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Fundamentals and applications of van der Waals magnets in magnon spintronics

Newton (2025)

Samuel Mañas‐Valero Toeno van der Sar R. A. Duine B. J. van Wees

Magnon

10.1016/j.newton.2025.100018

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Electronic spin transport, spin precession and spin relaxation in graphene field effect transistors

Bulletin of the American Physical Society (2010)

B. J. van Wees

Precession

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Suppression of Shubnikov–de Haas resistance oscillations due to selective population or detection of Landau levels: Absence of inter-Landau-level scattering on macroscopic length scales

Physical review. B, Condensed matter (1989)

B. J. van Wees E. M. M. Willems Leo P. Kouwenhoven C. J. P. M. Harmans J. Williamson

The Shubnikov--de Haas resistance oscillations of a wide two-dimensional electron gas are suppressed dramatically when current is injected with a quantum point contact which does not populate the upper Landau level. A similar suppression is observed when a quantum point contact is used as a voltage probe which does not detect the upper Landau level. The results are explained with a model in which the Shubnikov--de Haas oscillations arise from backscattering of electrons in the upper Landau level. It is shown that quantum ballistic transport in high magnetic fields can occur on length scales larger than 200 \ensuremath{\mu}m.

Landau quantization

Shubnikov–de Haas effect

10.1103/physrevb.39.8066

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Citations (124)

Electrical detection of spiral spin structures inPt|Cu2OSeO3heterostructures

Physical review. B./Physical review. B (2016)

Aisha Aqeel N. Vlietstra Arunesh Roy Maxim Mostovoy B. J. van Wees

The interaction between the itinerant spins in metals and localized spins in magnetic insulators thus far has only been explored in collinear spin systems, such as garnets. Here, we report the spin-Hall magnetoresistance (SMR) sensitive to the surface magnetization of the spin-spiral material, Cu_2OSeO_3. We experimentally demonstrate that the angular dependence of the SMR changes drastically at the transition between the helical spiral and the conical spiral phases. Furthermore, the sign and magnitude of the SMR in the conical spiral state are controlled by the cone angle. We show that this complex behaviour can be qualitatively explained within the SMR theory initially developed for collinear magnets. In addition, we studied the spin Seebeck effect (SSE), which is sensitive to the bulk magnetization. It originates from the conversion of thermally excited low-energy spin waves in the magnet, known as magnons, into the spin current in the adjacent metal contact (Pt). The SSE displays unconventional behavior where not only the magnitude but also the phase of the SSE vary with the applied magnetic field.

Magnon

10.1103/physrevb.94.134418

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Ballistic channels in an InAs 2 dimensional electron gas by means of a new highly selective etching technique

Alberto F. Morpurgo B. J. van Wees T. M. Klapwijk W. van der Graaf Gustaaf Borghs

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Hanle precession in the presence of energy-dependent coupling between localized states and an epitaxial graphene spin channel

Physical review. B./Physical review. B (2016)

J. J. van den Berg Alexey A. Kaverzin B. J. van Wees

Hanle spin precession measurements are a common method to extract the spin transport properties of graphene. In epitaxial graphene on silicon carbide, these measurements show unexpected behavior, due to presumed localized states in the carbon buffer layer that is present between the channel and the substrate. As a consequence, the Hanle curve narrows in its magnetic field dependence and can show an unconventional shape, which has been experimentally observed and modeled in previous studies. Here, we extend the previously developed model by assuming that the localized states are charge traps, that have a power-law distribution of trapping times. Our simulations show that the energy dependence of these trapping times can be extracted from the temperature evolution of the Hanle curve, which was previously observed in experiments. Our extended model gives better insight into what processes play a role when a spin channel is coupled to localized states and their relation to the experimental observations.

Hanle effect

Precession

10.1103/physrevb.94.235417

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Electrical detection of ferromagnetic resonance of nanomagnets using the anisotropic magnetoresistance effect

arXiv (Cornell University) (2005)

Julie Grollier Marius V. Costache C. H. van der Wal B. J. van Wees

We demonstrate a detection method for microwave spectroscopy on magnetization reversal dynamics of nanomagnets. Measurement of the nanomagnet anisotropic magnetoresistance was used for probing how magnetization reversal is resonantly enhanced by microwave magnetic fields. We used Co strips of 2 um x 130 nm x 40 nm, and microwave fields were applied via an on-chip coplanar wave guide. The method was applied for demonstrating single domain-wall resonance, and studying the role of resonant domain-wall dynamics in magnetization reversal.

Nanomagnet

Magnetization dynamics

Domain wall (magnetism)

Spin wave

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Giant magnon spin conductivity approaching the two-dimensional transport regime in ultrathin yttrium iron garnet films

Research Square (Research Square) (2022)

Xiangyang Wei O. Alves Santos Cristhian Humberto Sumba Lusero G. Bauer J. Ben Youssef

Abstract Conductivities are key material parameters that govern various types of transport (electronic charge, spin, heat etc.) driven by thermodynamic forces. Magnons, the elementary excitations of the magnetic order, flow under the gradient of a magnon chemical potential in proportion to a magnon (spin) conductivity σ m . The magnetic insulator yttrium iron garnet (YIG) is the material of choice for efficient magnon spin transport. Here we report an unexpected giant σ m in record-thin YIG films with thicknesses down to 3.7 nm when the number of occupied two-dimensional (2D) subbands is reduced from a large number to a few, which corresponds to a transition from 3D to 2D magnon transport. We extract a 2D spin conductivity (≈1 S) at room temperature, comparable to the (electronic) spin conductivity of the high-mobility two-dimensional electron gas in GaAs quantum wells at millikelvin temperatures. Such high conductivities offer unique opportunities to develop low-dissipation magnon-based spintronic devices.

Magnon

Yttrium Iron Garnet

10.21203/rs.3.rs-1217468/v1

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