Study of Gd-doped Bi2Te3 thin films: Molecular beam epitaxy growth and magnetic properties by Harrison, SE, Collins-McIntyre, L, Li, S, Baker, A, Shelford, L, Huo, Y, Pushp, A, Parkin, S, Harris, J, Arenholz, E, van der Laan, G, Hesjedal, T

“…Magnetometry reveals that the films are paramagnetic down to 1.5 K. X-ray magnetic circular dichroism at the Gd M4,5 edge at 1.5 K reveals a saturation field of ∼6 T, and a slow decay of the magnetic moment with temperature up to 200 K. …”

Electronic structure of Fe and Co magnetic adatoms on Bi2Te3 surfaces by Shelford, L, Hesjedal, T, Collins-McIntyre, L, Dhesi, S, Maccherozzi, F, van der Laan, G

“…Magnetic doping of topological insulators (TIs) is a prerequisite for their application as spin-based devices. Using x-ray magnetic circular dichroism (XMCD) we investigate the influence of an ultralow coverage (∼0.5% of a monolayer) of magnetic atoms on a TI substrate. …”

Magnetic ordering in Ho-doped Bi2Te3 topological insulator thin films by Figueroa, A, Harrison, S, Collins-McIntyre, L, van der Laan, G, Hesjedal, T

“…Analysis of the polarized x-ray absorption spectra at the Ho M5 absorption edge gives an effective 4f magnetic moment which is ~45% of the Hund's rule ground state value. X-ray magnetic circular dichroism (XMCD) shows no significant anisotropy, which suggests that the reduced spin moment is not due to the crystal field effects, but rather the presence of non-magnetic or antiferromagnetic Ho sites. …”

Magnetic Cr doping of Bi2Se3: Evidence for divalent Cr from x-ray spectroscopy by Figueroa, A, van der Laan, G, Collins-McIntyre, L, Zhang, S, Baker, A, Harrison, SE, Schoenherr, P, Cibin, G, Hesjedal, T

“…Comparison of the Cr L2,3 x-ray magnetic circular dichroism at T=5 K with multiplet calculations gives a spin moment of 3.64 μB/Crbulk, which is close to the saturation moment for Cr2+ d4. …”

Study of the structural, electric and magnetic properties of Mn-doped Bi2Te3 single crystals by Watson, MD, Collins-McIntyre, L, Shelford, L, Coldea, A, Prabhakaran, D, Speller, S, Mousavi, T, Grovenor, C, Salman, Z, Giblin, SR, van der Laan, G, Hesjedal, T

“…Hall measurements on different crystals established that these systems are n-doped with carrier concentrations of ∼ 0.5-3.0 × 1020 cm-3. X-ray magnetic circular dichroism (XMCD) at the Mn L 2,3 edge at 1.8 K reveals a large spin magnetic moment of 4.3(3) μB/Mn, and a small orbital magnetic moment of 0.18(2) μB/Mn. …”

Transition-metal doped Bi2Se3 and Bi2Te3 topological insulator thin films by Collins-McIntyre, L, Liam J. Collins-McIntyre

“…Mn-doped Bi₂Se₃ thin films were grown by MBE and their magnetic properties investigated by superconducting quantum interference device (SQUID) magnetometry and x-ray magnetic circular dichroism (XMCD). These reveal a saturation magnetisation of 5.1 μ_B/Mn and show the formation of short-range magnetic order at 2.5 K (from XMCD) with indication of a ferromagnetic ground state forming below 1.5 K.…”