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Magnetic ordering in Cr-doped Bi2Se3 thin films

DOI: 10.1209/0295-5075/107/57009 DOI Help

Authors: Liam Collins-mcintyre (Department of Physics, University of Oxford, U.K.) , S. E. Harrison (Department of Physics, University of Oxford, U.K) , P. Schönherr (Department of Physics, University of Oxford, U.K) , N.-j. Steinke (ISIS Pulsed Neutron and Muon Source, ISIS, U.K.) , Christy Kinane (ISIS Pulsed Neutron and Muon Source, ISIS, U.K.) , Timothy Charlton (ISIS Pulsed Neutron and Muon Source, ISIS, U.K.) , D. Alba-veneroa (ISIS Pulsed Neutron and Muon Source, ISIS, U.K.) , A. Pushp (IBM Almaden Research Center, USA) , A. J. Kellock (IBM Almaden Research Center, USA) , S. S. P. Parkin (IBM Almaden Research Center) , J. S. Harris (Department of Electrical Engineering, Stanford University, USA) , Sean Langridge (ISIS Pulsed Neutron and Muon Source, ISIS, U.K.) , Gerrit Van Der Laan (Diamond Light Source) , Thorsten Hesjedal (Department of Physics, University of Oxford, U.K.)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: EPL (Europhysics Letters) , VOL 107 (5)

State: Published (Approved)
Published: September 2014

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. High-resolution 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 per Cr ion. The magnetic hysteresis curve shows an open loop with a coercive field of . The ferromagnetic transition temperature was determined to be analyzing the magnetization-temperature gradient. PNR shows the film to be homogeneously ferromagnetic with no enhanced magnetism near the surface or interface.

Subject Areas: Physics, Materials


Instruments: I10-Beamline for Advanced Dichroism

Documents:
0295-5075_107_5_57009.pdf