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The influence of interfacial roughness on the coherence of structure and magnetic coupling across barriers in Fe/MgO multilayers
DOI:
10.1088/0953-8984/22/22/226004
Authors:
R.
Fan
(ISIS)
,
S. J.
Lee
(University of Liverpool)
,
J. P.
Goff
(Royal Holloway University of London)
,
R. C. C.
Ward
(University of Oxford)
,
S. G.
Wang
(University of Oxford)
,
A.
Kohn
(University of Oxford)
,
C.
Wang
(University of Oxford)
,
A. R.
Wildes
(Institut Laue-Langevin)
,
S. P.
Collins
(Diamond Light Source)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Journal Of Physics: Condensed Matter
, VOL 22 (2)
, PAGES 226004
State:
Published (Approved)
Published:
May 2010
Abstract: Single-crystal Fe/MgO multilayers are model systems in which to study magnetic tunnel junctions. We find that the interfacial roughness leads to the loss of coherence of the crystal structure. For thick MgO layers ferromagnetic (FM) ordering is found using polarized neutron reflectivity (PNR). For thin MgO layers magnetization measurements reveal the presence of antiferromagnetic (AF) interactions, but no long-range AF order is found using PNR. After cycling in a hysteresis loop, FM correlations are found at the coercive point, and this will limit the maximum tunnelling magnetoresistance.
Subject Areas:
Physics,
Materials
Instruments:
I16-Materials and Magnetism
Added On:
14/07/2010 10:17
Discipline Tags:
Quantum Materials
Physics
Hard condensed matter - structures
Magnetism
Materials Science
Technical Tags:
Diffraction
X-ray Reflectivity (XRR)