Thin film quantum materials

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Transverse field muon-spin rotation measurement of the topological anomaly in a thin film of MnSi

Physical Review B: Condensed Matter and Materials Physics American Physical Society 93:14 (2016) 140412(R)

Authors:

T Lancaster, F Xiao, Z Salman, IO Thomas, Stephen J Blundell, F Pratt, SJ Clark, T Prokscha, A Suter, SL Zhang, Alexander A Baker, Thorsten Hesjedal

Abstract:

We present the results of transverse-field muon-spin rotation measurements on an epitaxially grown 40-nm-thick film of MnSi on Si(111) in the region of the field-temperature phase diagram where a skyrmion phase has been observed in the bulk. We identify changes in the quasistatic magnetic field distribution sampled by the muon, along with evidence for magnetic transitions around T≈40 and 30 K. Our results suggest that the cone phase is not the only magnetic texture realized in film samples for out-of-plane fields.
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‘Chiral damping of field driven magnetic domain walls’

Nature Materials, 15, 272-277 (2016).

Authors:

E. Jué , C. K. Safeer , M. Droudard, L-D Buda Prejbeanu, S.Auffret , A.Manchon, A.Schuhl, O. Boulle , I.M. Miron, , G. Gaudin.

Abstract:

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The effect of atomic structure on interface spin-polarization of half-metallic spin valves: Co2MnSi/Ag epitaxial interfaces

Applied Physics Letters AIP Publishing 107:21 (2015) 212404

Authors:

Zlatko Nedelkoski, Philip J Hasnip, Ana M Sanchez, Balati Kuerbanjiang, Edward Higgins, Mikihiko Oogane, Atsufumi Hirohata, Gavin R Bell, Vlado K Lazarov
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Transverse field muon-spin rotation measurement of the topological anomaly in a thin film of MnSi

(2015)

Authors:

T Lancaster, F Xiao, Z Salman, IO Thomas, SJ Blundell, FL Pratt, SJ Clark, T Prokscha, A Suter, SL Zhang, AA Baker, T Hesjedal
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Study of Ho-doped Bi2Te3 topological insulator thin films

Applied Physics Letters American Institute of Physics 107:18 (2015) 182406

Authors:

SE Harrison, Liam J Collins-McIntyre, Shilei Zhang, Alexander A Baker, AI Figueroa, AJ Kellock, A Pushp, YL Chen, SSP Parkin, JS Harris, G van der Laan, Thorsten Hesjedal

Abstract:

Breaking time-reversal symmetry through magnetic doping of topological insulators has been identified as a key strategy for unlocking exotic physical states. Here, we report the growth of Bi2Te3 thin films doped with the highest magnetic moment element Ho. Diffraction studies demonstrate high quality films for up to 21% Ho incorporation. Superconducting quantum interference device magnetometry reveals paramagnetism down to 2 K with an effective magnetic moment of ∼5 μB/Ho. Angle-resolved photoemission spectroscopy shows that the topological surface state remains intact with Ho doping, consistent with the material's paramagnetic state. The large saturation moment achieved makes these films useful for incorporation into heterostructures, whereby magnetic order can be introduced via interfacial coupling.
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