Professor Thorsten Hesjedal FInstP: Publications

Cover Picture: A new topological insulator built from quasi one‐dimensional atomic ribbons (Phys. Status Solidi RRL 2/2015)

physica status solidi (RRL) - Rapid Research Letters Wiley 9:2 (2015) n/a-n/a

Authors:

Piet Schönherr, Shilei Zhang, Yuanqian Liu, Patryk Kusch, Stephanie Reich, Terence Giles, Dominik Daisenberger, Dharmalingam Prabhakaran, Yulin Chen, Thorsten Hesjedal

Spin pumping in ferromagnet-topological insulator-ferromagnetheterostructures

Scientific Reports Nature Publishing Group 5:1 (2015) 7907

Authors:

Alexander Baker, AI Figueroa, Liam Collins-Mcintyre, G van der Laan, Thorsten Hesjedal

Abstract:

Topological insulators (TIs) are enticing prospects for the future of spintronics due to their large spin-orbit coupling and dissipationless, counter-propagating conduction channels in the surface state. However, a means to interact with and exploit the topological surface state remains elusive. Here, we report a study of spin pumping at the TI-ferromagnet interface, investigating spin transfer dynamics in a spin-valve like structure using element specific time-resolved x-ray magnetic circular dichroism and ferromagnetic resonance. Gilbert damping increases approximately linearly with increasing TI thickness, indicating efficient behaviour as a spin sink. However, layer-resolved measurements suggest that a dynamic coupling is limited. These results shed new light on the spin dynamics of this novel material class and suggest great potential for TIs in spintronic devices, through their novel magnetodynamics that persist even up to room temperature.

Structural properties and growth mechanism of Cd3As2 nanowires

Applied Physics Letters AIP Publishing 106:1 (2015) 013115

Authors:

P Schönherr, T Hesjedal

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

New Journal of Physics IOP Publishing 17:1 (2015) 013019

Authors:

GBG Stenning, LR Shelford, SA Cavill, F Hoffmann, M Haertinger, T Hesjedal, G Woltersdorf, GJ Bowden, SA Gregory, CH Back, PAJ de Groot, G van der Laan

Transverse field muon-spin rotation signature of the skyrmion lattice phase in Cu2OSeO3

Physical Review A American Physical Society 91:22 (2015) 224408

Authors:

T Lancaster, RC Williams, IO Thomas, F Xiao, FL Pratt, Stephen J Blundell, Thorsten Hesjedal, SJ Clark, PD Hatton, MC Hatnean, DS Keeble, G Balakrishnan, JC Loudon

Abstract:

We present the results of transverse field (TF) muon-spin rotation (μ+SR) measurements on Cu2OSeO3, which has a skyrmion-lattice (SL) phase. We measure the response of the TF μ+SR signal in that phase along with the surrounding ones, and suggest how the phases might be distinguished using the results of these measurements. Dipole field simulations 91̽�� the conclusion that the muon is sensitive to the SL via the TF line shape and, based on this interpretation, our measurements suggest that the SL is quasistatic on a time scale τ>100 ns.

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