Magnetic ordering in Cr-doped Bi2Se3 thin films

L. J. Collins-Mcintyre; S. E. Harrison; P. Schönherr; N. J. Steinke; C. J. Kinane; T. R. Charlton; D. Alba-Veneroa; A. Pushp; A. J. Kellock; S. S.P. Parkin; J. S. Harris; S. Langridge; G. Van Der Laan; T. Hesjedal

doi:10.1209/0295-5075/107/57009

Magnetic ordering in Cr-doped Bi₂Se₃ thin films

L. J. Collins-Mcintyre, S. E. Harrison, P. Schönherr, N. J. Steinke, C. J. Kinane, T. R. Charlton, D. Alba-Veneroa, A. Pushp, A. J. Kellock, S. S.P. Parkin, J. S. Harris, S. Langridge, G. Van Der Laan, T. Hesjedal

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63 Scopus citations

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 ∼2.1 μ_B 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 analyzing the magnetization-temperature gradient. PNR shows the film to be homogeneously ferromagnetic with no enhanced magnetism near the surface or interface.

Original language	English
Article number	57009
Journal	EPL
Volume	107
Issue number	5
DOIs	https://doi.org/10.1209/0295-5075/107/57009
State	Published - Sep 2014
Externally published	Yes

Funding

This publication arises from research funded by the John Fell Oxford University Press Research Fund. We thank ISIS for neutron beamtime (RB1320531), Diamond Light Source for AFM and XRD access, and RCaH for their hospitality. LCM and PS acknowledge partial financial support from EPSRC, and PS also from the Stu-dienstiftung and Corpus Christi College. SEH acknowledges DARPA’s MesoDynamic Architectures Program (No. N66001-11-1-4105) and VPGE (Stanford University). This publication arises from research funded by the John Fell Oxford University Press Research Fund. We thank ISIS for neutron beamtime (RB1320531), Diamond Light Source for AFM and XRD access, and RCaH for their hospitality. LCM and PS acknowledge partial financial support from EPSRC, and PS also from the Studienstiftung and Corpus Christi College. SEH acknowledges DARPA's MesoDynamic Architectures Program (No. N66001-11-1-4105) and VPGE (Stanford University).

Funders	Funder number
DARPA's
John Fell Oxford University Press Research Fund
Stu-dienstiftung and Corpus Christi College
Studienstiftung and Corpus Christi College
VPGE
arises
Defense Advanced Research Projects Agency	N66001-11-1-4105
Stanford University
Advanced Foods and Materials Canada
Office of the Vice Provost for Graduate Education, Stanford University
Engineering and Physical Sciences Research Council
John Fell Fund, University of Oxford	RB1320531

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title = "Magnetic ordering in Cr-doped Bi2Se3 thin films",

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 ∼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 analyzing the magnetization-temperature gradient. PNR shows the film to be homogeneously ferromagnetic with no enhanced magnetism near the surface or interface.",

author = "Collins-Mcintyre, {L. J.} and Harrison, {S. E.} and P. Sch{\"o}nherr and Steinke, {N. J.} and Kinane, {C. J.} and Charlton, {T. R.} and D. Alba-Veneroa and A. Pushp and Kellock, {A. J.} and Parkin, {S. S.P.} and Harris, {J. S.} and S. Langridge and {Van Der Laan}, G. and T. Hesjedal",

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doi = "10.1209/0295-5075/107/57009",

language = "English",

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T1 - Magnetic ordering in Cr-doped Bi2Se3 thin films

AU - Collins-Mcintyre, L. J.

AU - Harrison, S. E.

AU - Schönherr, P.

AU - Steinke, N. J.

AU - Kinane, C. J.

AU - Charlton, T. R.

AU - Alba-Veneroa, D.

AU - Pushp, A.

AU - Kellock, A. J.

AU - Parkin, S. S.P.

AU - Harris, J. S.

AU - Langridge, S.

AU - Van Der Laan, G.

AU - Hesjedal, T.

PY - 2014/9

Y1 - 2014/9

N2 - 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 ∼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 analyzing the magnetization-temperature gradient. PNR shows the film to be homogeneously ferromagnetic with no enhanced magnetism near the surface or interface.

AB - 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 ∼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 analyzing the magnetization-temperature gradient. PNR shows the film to be homogeneously ferromagnetic with no enhanced magnetism near the surface or interface.

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Magnetic ordering in Cr-doped Bi₂Se₃ thin films

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