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Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions
DOI:
10.1103/PhysRevB.103.064416
Authors:
L.
Gladczuk
(University of Oxford; Diamond Light Source)
,
L.
Gladczuk
(Institute of Physics, Polish Academy of Science)
,
P.
Dluzewski
(Institute of Physics, Polish Academy of Science)
,
K.
Lasek
(Institute of Physics, Polish Academy of Science)
,
P.
Aleshkevych
(Institute of Physics, Polish Academy of Science)
,
D. M.
Burn
(Diamond Light Source)
,
G.
Van Der Laan
(Diamond Light Source)
,
T.
Hesjedal
(University of Oxford)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Physical Review B
, VOL 103
State:
Published (Approved)
Published:
February 2021
Diamond Proposal Number(s):
21616
,
18759
Abstract: Heterostructures composed of ferromagnetic layers that are mutually interacting through a nonmagnetic spacer are at the core of magnetic sensor and memory devices. In the present study, layer-resolved ferromagnetic resonance was used to investigate the coupling between the magnetic layers of a Co/MgO/Permalloy magnetic tunnel junction. Two magnetic resonance peaks were observed for both magnetic layers, as probed at the Co and Ni L 3 x-ray absorption edges, showing a strong interlayer interaction through the insulating MgO barrier. A theoretical model based on the Landau-Lifshitz-Gilbert-Slonczewski equation was developed, including exchange coupling and spin pumping between the magnetic layers. Fits to the experimental data were carried out, both with and without a spin pumping term, and the goodness of the fit was compared using a likelihood ratio test. This rigorous statistical approach provides an unambiguous proof of the existence of interlayer coupling mediated by spin pumping.
Journal Keywords: Magnetic tunnel junctions; Multilayer thin films; Ferromagnetic resonance; X-ray magnetic circular dichroism
Subject Areas:
Materials,
Physics
Instruments:
I10-Beamline for Advanced Dichroism
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