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On-chip phonon-magnon reservoir for neuromorphic computing (2023)
Journal Article
Yaremkevich, D. D., Scherbakov, A. V., De Clerk, L., Kukhtaruk, S. M., Nadzeyka, A., Campion, R., …Bayer, M. (2023). On-chip phonon-magnon reservoir for neuromorphic computing. Nature Communications, 14(1), Article 8296. https://doi.org/10.1038/s41467-023-43891-y

Reservoir computing is a concept involving mapping signals onto a high-dimensional phase space of a dynamical system called “reservoir” for subsequent recognition by an artificial neural network. We implement this concept in a nanodevice consisting o... Read More about On-chip phonon-magnon reservoir for neuromorphic computing.

Electrical control of 180° domain walls in an antiferromagnet (2023)
Journal Article
Amin, O. J., Reimers, S., Maccherozzi, F., Dhesi, S. S., Novák, V., Campion, R. P., …Wadley, P. (2023). Electrical control of 180° domain walls in an antiferromagnet. APL Materials, 11(9), Article 091112. https://doi.org/10.1063/5.0156508

We demonstrate the reversible current-induced motion of 180° antiferromagnetic domain walls in a CuMnAs device. By controlling the magnitude and direction of the current pulse, the position of a domain wall can be switched between three distinct pinn... Read More about Electrical control of 180° domain walls in an antiferromagnet.

Antiferromagnetic half-skyrmions electrically generated and controlled at room temperature (2023)
Journal Article
Amin, O. J., Poole, S. F., Reimers, S., Barton, L. X., Dal Din, A., Maccherozzi, F., …Wadley, P. (2023). Antiferromagnetic half-skyrmions electrically generated and controlled at room temperature. Nature Nanotechnology, 18(8), 849-853. https://doi.org/10.1038/s41565-023-01386-3

Topologically protected magnetic textures are promising candidates for information carriers in future memory devices, as they can be efficiently propelled at very high velocities using current-induced spin torques. These textures—nanoscale whirls in... Read More about Antiferromagnetic half-skyrmions electrically generated and controlled at room temperature.

Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs (2023)
Journal Article
Linn, A. G., Hao, P., Gordon, K. N., Narayan, D., Berggren, B. S., Speiser, N., …Dessau, D. S. (2023). Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs. npj Quantum Materials, 8(1), Article 19. https://doi.org/10.1038/s41535-023-00554-x

Tetragonal CuMnAs is a room temperature antiferromagnet with an electrically reorientable Néel vector and a Dirac semimetal candidate. Direct measurements of the electronic structure of single-crystalline thin films of tetragonal CuMnAs using angle-r... Read More about Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs.

Probing the manipulation of antiferromagnetic order in CuMnAs films using neutron diffraction (2022)
Journal Article
Poole, S. F., Barton, L. X., Wang, M., Manuel, P., Khalyavin, D., Langridge, S., …Wadley, P. (2022). Probing the manipulation of antiferromagnetic order in CuMnAs films using neutron diffraction. Applied Physics Letters, 121(5), Article 052402. https://doi.org/10.1063/5.0103390

We describe measurements of the uniaxial magnetic anisotropy and spin-flop rotation of the Néel vector in antiferromagnetic CuMnAs thin films using neutron diffraction. The suppression of the magnetic (100) peak under magnetic fields is observed for... Read More about Probing the manipulation of antiferromagnetic order in CuMnAs films using neutron diffraction.

Optically Gated Terahertz-Field-Driven Switching of Antiferromagnetic CuMnAs (2021)
Journal Article
Heitz, J. J., Nádvorník, L., Balos, V., Behovits, Y., Chekhov, A. L., Seifert, T. S., …Kampfrath, T. (2021). Optically Gated Terahertz-Field-Driven Switching of Antiferromagnetic CuMnAs. Physical Review Applied, 16(6), Article 064047. https://doi.org/10.1103/PhysRevApplied.16.064047

We show scalable and complete suppression of the recently reported terahertz-pulse-induced switching between different resistance states of antiferromagnetic CuMnAs thin films by ultrafast gating. The gating functionality is achieved by an optically... Read More about Optically Gated Terahertz-Field-Driven Switching of Antiferromagnetic CuMnAs.

Performance evaluation of a new 30 ?m thick GaAs X-ray detector grown by MBE (2021)
Journal Article
Lioliou, G., Poyser, C. L., Whale, J., Campion, R. P., Kent, A. J., & Barnett, A. (2021). Performance evaluation of a new 30 ?m thick GaAs X-ray detector grown by MBE. Materials Research Express, 8(2), Article 025909. https://doi.org/10.1088/2053-1591/abe73c

A circular mesa (400 μm diameter) GaAs p+-i-n+ photodiode with a 30 μm thick i layer was characterized for its performance as a detector in photon counting x-ray spectroscopy at 20 °C. The detector was fabricated from material grown by molecular beam... Read More about Performance evaluation of a new 30 ?m thick GaAs X-ray detector grown by MBE.

Protected Long-Distance Guiding of Hypersound Underneath a Nanocorrugated Surface (2021)
Journal Article
Yaremkevich, D. D., Scherbakov, A. V., Kukhtaruk, S. M., Linnik, T. L., Khokhlov, N. E., Godejohann, F., …Bayer, M. (2021). Protected Long-Distance Guiding of Hypersound Underneath a Nanocorrugated Surface. ACS Nano, 15(3), 4802–4810. https://doi.org/10.1021/acsnano.0c09475

In nanoscale communications, high-frequency surface acoustic waves are becoming effective data carriers and encoders. On-chip communications require acoustic wave propagation along nanocorrugated surfaces which strongly scatter traditional Rayleigh w... Read More about Protected Long-Distance Guiding of Hypersound Underneath a Nanocorrugated Surface.

Magnetism and magnetoresistance in the critical region of a dilute ferromagnet (2021)
Journal Article
Wang, M., Howells, B., Marshall, R. A., Taylor, J. M., Edmonds, K. W., Rushforth, A. W., …Gallagher, B. L. (2021). Magnetism and magnetoresistance in the critical region of a dilute ferromagnet. Scientific Reports, 11, Article 2300. https://doi.org/10.1038/s41598-021-81893-2

We present detailed experimental measurements and simulations of the field-dependent magnetization and magnetoresistance in the vicinity of the Curie temperature in the highly disordered dilute ferromagnetic semiconductor (Ga,Mn)As. The observed depe... Read More about Magnetism and magnetoresistance in the critical region of a dilute ferromagnet.

Quenching of an antiferromagnet into high resistivity states using electrical or ultrashort optical pulses (2020)
Journal Article
Kašpar, Z., Surýnek, M., Zubáč, J., Krizek, F., Novák, V., Campion, R. P., …Jungwirth, T. (2021). Quenching of an antiferromagnet into high resistivity states using electrical or ultrashort optical pulses. Nature Electronics, 4(1), 30-37. https://doi.org/10.1038/s41928-020-00506-4

Antiferromagnets are of potential use in the development of spintronic devices due to their ultrafast dynamics, insensitivity to external magnetic fields and absence of magnetic stray fields. Similar to their ferromagnetic counterparts, antiferromagn... Read More about Quenching of an antiferromagnet into high resistivity states using electrical or ultrashort optical pulses.

Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs (2020)
Journal Article
Janda, T., Godinho, J., Ostatnicky, T., Pfitzner, E., Ulrich, G., Hoehl, A., …Wunderlich, J. (2020). Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs. Physical Review Materials, 4(9), Article 094413. https://doi.org/10.1103/physrevmaterials.4.094413

Antiferromagnets offer spintronic device characteristics unparalleled in ferromagnets owing to their lack of stray fields, THz spin dynamics, and rich materials landscape. Microscopic imaging of antiferromagnetic domains is one of the key prerequisit... Read More about Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs.

Investigation of magnetic anisotropy and heat dissipation in thin films of compensated antiferromagnet CuMnAs by pump–probe experiment (2020)
Journal Article
Surýnek, M., Saidl, V., Kašpar, Z., Novák, V., Campion, R. P., Wadley, P., & Němec, P. (2020). Investigation of magnetic anisotropy and heat dissipation in thin films of compensated antiferromagnet CuMnAs by pump–probe experiment. Journal of Applied Physics, 127(23), 233904. https://doi.org/10.1063/5.0006185

We recently reported on a method to determine the easy axis position in a 10 nm thick film of the fully compensated antiferromagnet CuMnAs. The film had a uniaxial magnetic anisotropy and the technique utilized a magneto-optical pump and probe experi... Read More about Investigation of magnetic anisotropy and heat dissipation in thin films of compensated antiferromagnet CuMnAs by pump–probe experiment.

Low-energy switching of antiferromagnetic CuMnAs/GaP using sub-10 nanosecond current pulses (2020)
Journal Article
Omari, K. A., Barton, L. X., Amin, O., Campion, R. P., Rushforth, A. W., Kent, A. J., …Edmonds, K. W. (2020). Low-energy switching of antiferromagnetic CuMnAs/GaP using sub-10 nanosecond current pulses. Journal of Applied Physics, 127(19), Article 193906. https://doi.org/10.1063/5.0006183

The recently discovered electrical-induced switching of antiferromagnetic (AF) materials that have spatial inversion asymmetry has enriched the field of spintronics immensely and opened the door for the concept of antiferromagnetic memory devices. Cu... Read More about Low-energy switching of antiferromagnetic CuMnAs/GaP using sub-10 nanosecond current pulses.

Temporal superoscillations of subterahertz coherent acoustic phonons (2020)
Journal Article
Brehm, S., Akimov, A. V., Campion, R. P., & Kent, A. J. (2020). Temporal superoscillations of subterahertz coherent acoustic phonons. Physical Review Research, 2(2), Article 023009. https://doi.org/10.1103/physrevresearch.2.023009

We observe coherent acoustic phonon superoscillations at subterahertz frequencies. The superoscillations result from the interference of optically excited coherent longitudinal acoustic phonon modes in a GaAs/AlGaAs superlattice. The superoscillation... Read More about Temporal superoscillations of subterahertz coherent acoustic phonons.

Gating effects in antiferromagnetic CuMnAs (2019)
Journal Article
Grzybowski, M. J., Wadley, P., Edmonds, K. W., Campion, R. P., Dybko, K., Majewicz, M., …Dietl, T. (2019). Gating effects in antiferromagnetic CuMnAs. AIP Advances, 9(11), 1-5. https://doi.org/10.1063/1.5124354

Antiferromagnets (AFs) attract much attention due to their potential applications in spintronics. Both the electric current and the electric field are considered as tools suitable to control the properties and the Néel vector direction of AFs. Among... Read More about Gating effects in antiferromagnetic CuMnAs.

Thermal stability of interstitial and substitutional Mn in ferromagnetic (Ga,Mn)As (2019)
Journal Article
Lima, T. A. L., Wahl, U., Costa, A., Augustyns, V., Edmonds, K. W., Gallagher, B. L., …Pereira, L. M. C. (2019). Thermal stability of interstitial and substitutional Mn in ferromagnetic (Ga,Mn)As. Physical Review B, 100(14), Article 144409. https://doi.org/10.1103/physrevb.100.144409

© 2019 American Physical Society. In (Ga,Mn)As, a model dilute magnetic semiconductor, the electric and magnetic properties are strongly influenced by the lattice sites occupied by the Mn atoms. In particular, the highest Curie temperatures are achie... Read More about Thermal stability of interstitial and substitutional Mn in ferromagnetic (Ga,Mn)As.

30 μm thick GaAs X-ray p + -i-n + photodiode grown by MBE (2019)
Journal Article
Lioliou, G., Poyser, C., Butera, S., Campion, R., Kent, A., & Barnett, A. (2019). 30 μm thick GaAs X-ray p + -i-n + photodiode grown by MBE. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 946, Article 162670. https://doi.org/10.1016/j.nima.2019.162670

7 8 A GaAs p +-in + photodiode detector with a 30 μm thick i layer and a 400 μm diameter was processed using 9 standard wet chemical etching from material grown by molecular beam epitaxy. The detector was 10 characterized for its electrical and photo... Read More about 30 μm thick GaAs X-ray p + -i-n + photodiode grown by MBE.

A high electron mobility phonotransistor (2018)
Journal Article
Poyser, C. L., Li, L. H., Campion, R. P., Akimov, A. V., Linfield, E. H., Davies, A. G., …Kent, A. J. (2018). A high electron mobility phonotransistor. Communications Physics, 1, 1-7. https://doi.org/10.1038/s42005-018-0059-7

Acoustoelectric devices convert acoustic energy to electrical energy and vice versa. Devices working at much higher acoustic frequencies than those currently available have potential scientific and technological applications, e.g.: as detectors in ph... Read More about A high electron mobility phonotransistor.

Current polarity-dependent manipulation of antiferromagnetic domains (2018)
Journal Article
Wadley, P., Reimers, S., Grzybowski, M. J., Andrews, C., Wang, M., Chauhan, J., …Jungwirth, T. (2018). Current polarity-dependent manipulation of antiferromagnetic domains. Nature Nanotechnology, 13(5), 362-365. https://doi.org/10.1038/s41565-018-0079-1

Antiferromagnets have several favourable properties as active elements in spintronic devices, including ultra-fast dynamics, zero stray fields and insensitivity to external magnetic fields. Tetragonal CuMnAs is a testbed system in which the antiferro... Read More about Current polarity-dependent manipulation of antiferromagnetic domains.

Switching the uniaxial magnetic anisotropy by ion irradiation induced compensation (2018)
Journal Article
Yuan, Y., Amarouche, T., Xu, C., Rushforth, A., Böttger, R., Edmonds, K., …Zhou, S. (2018). Switching the uniaxial magnetic anisotropy by ion irradiation induced compensation. Journal of Physics D: Applied Physics, 51(14), https://doi.org/10.1088/1361-6463/aab1db

© 2018 IOP Publishing Ltd. In the present work, the uniaxial magnetic anisotropy of GaMnAsP is modified by helium ion irradiation. According to the micro-magnetic parameters, e.g. resonance fields and anisotropy constants deduced from ferromagnetic r... Read More about Switching the uniaxial magnetic anisotropy by ion irradiation induced compensation.