Thin film quantum materials

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

(2014)

Authors:

T Lancaster, RC Williams, IO Thomas, F Xiao, FL Pratt, SJ Blundell, JC Loudon, T Hesjedal, SJ Clark, PD Hatton, M Ciomaga Hatnean, DS Keeble, G Balakrishnan
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Catalyst-free growth of Bi2Te3 nanostructures by molecular beam epitaxy

Applied Physics Letters AIP Publishing 105:15 (2014) 153114

Authors:

SE Harrison, P Schönherr, Y Huo, JS Harris, T Hesjedal
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Magnetic Cr doping of Bi2Se3: Evidence for divalent Cr from x-ray spectroscopy

Physical Review B American Physical Society (APS) 90:13 (2014) 134402

Authors:

AI Figueroa, G van der Laan, LJ Collins-McIntyre, S-L Zhang, AA Baker, SE Harrison, P Schönherr, G Cibin, T Hesjedal
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Preparation of layered thin film samples for angle-resolved photoemission spectroscopy

Applied Physics Letters AIP Publishing 105:12 (2014) 121608

Authors:

SE Harrison, B Zhou, Y Huo, A Pushp, AJ Kellock, SSP Parkin, JS Harris, Y Chen, T Hesjedal
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Magnetic ordering in Cr-doped Bi₂Se₃ thin films

Europhysics Letters European Physical Society 107:5 (2014) 57009-57009

Authors:

Liam Collins-Mcintyre, SE Harrison, Piet Schoenherr, N-J Steinke, C Kinane, T Charlton, D Alba-Veneroa, A Phusp, A Kellock, SSP Parkin, JS Harris, S Langridge, G van der Laan, Thorsten Hesjedal

Abstract:

We report the structural and magnetic study of Cr-doped Bi2Se3 thin films using x-ray diffraction (XRD), magnetometry and polarized neutron reflectometry (PNR). Epitaxial layers were grown on c-plane sapphire by molecular beam epitaxy in a two-step process. Highresolution XRD shows the exceptionally high crystalline quality of the doped films with no parasitic phases up to a Cr concentration of 12% (in % of the Bi sites occupied by substitutional Cr). The magnetic moment, measured by SQUID magnetometry, was found to be ∼2.1 μB per Cr ion. The magnetic hysteresis curve shows an open loop with a coercive field of ∼10 mT. The ferromagnetic transition temperature was determined to be 8.5 K analyzing the magnetizationtemperature gradient. PNR shows the film to be homogeneously ferromagnetic with no enhanced magnetism near the surface or interface.
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