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X-ray magnetic spectroscopy of MBE-grown Mn-doped Bi2Se3 thin films
Authors:
L. J.
Collins-Mcintyre
(University of Oxford)
,
M. D.
Watson
(University of Oxford)
,
A. A.
Baker
(University of Oxford; Diamond Light Source)
,
S. L.
Zhang
(University of Oxford)
,
A. I.
Coldea
(University of Oxford)
,
S. E.
Harrison
(Stanford University)
,
A.
Pushp
(IBM Almaden Research Center)
,
A. J.
Kellock
(IBM Almaden Research Center)
,
S. S. P.
Parkin
(IBM Almaden Research Center)
,
G.
Van Der Laan
(Diamond Light Source)
,
T.
Hesjedal
(University of Oxford)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Aip Advances
, VOL 4 (12)
State:
Published (Approved)
Published:
December 2014
Diamond Proposal Number(s):
8529
Abstract: We report the growth of Mn-doped Bi2Se3 thin films by molecular beam epitaxy (MBE), investigated by x-ray diffraction (XRD), atomic force microscopy (AFM), SQUID magnetometry and x-ray magnetic circular dichroism (XMCD). Epitaxial films were deposited on c-plane sapphire substrates by co-evaporation. The films exhibit a spiral growth mechanism typical of this material class, as revealed by AFM. The XRD measurements demonstrate a good crystalline structure which is retained upon doping up to ¡7.5 atomic-% Mn, determined by Rutherford backscattering spectrometry (RBS), and show no evidence of the formation of parasitic phases. However an increasing interstitial incorporation of Mn is observed with increasing doping concentration. A magnetic moment of 5.1 ¥ìB/Mn is obtained from bulk-sensitive SQUID measurements, and a much lower moment of 1.6 ¥ìB/Mn from surface-sensitive XMCD. At ¡2.5 K, XMCD at the Mn L2,3 edge, reveals short-range magnetic order in the films and indicates ferromagnetic order below 1.5 K.
Journal Keywords: Atomic Force Microscopy; Bismuth Selenides; Deposits; Doped Materials; Evaporation; Magnetic Circular Dichroism; Magnetic Moments; Molecular Beam Epitaxy; Rutherford Backscattering Spectroscopy; Sapphire; Squid Devices; Substrates; Thin Films; X Radiation; X-Ray Diffraction
Diamond Keywords: Ferromagnetism; Semiconductors
Subject Areas:
Physics,
Materials
Instruments:
I10-Beamline for Advanced Dichroism - scattering
Added On:
18/12/2014 11:22
Documents:
1.4904900.pdf
Discipline Tags:
Surfaces
Quantum Materials
Physics
Hard condensed matter - structures
Magnetism
Materials Science
interfaces and thin films
Technical Tags:
Spectroscopy
Circular Dichroism (CD)
X-ray Absorption Spectroscopy (XAS)
X-ray Magnetic Circular Dichroism (XMCD)