Interlayer coupling in Fe/Cr/Gd multilayer structures

The effect of the chromium layer thickness on the magnetic state of an [Fe/Cr/Gd/Cr] n multilayer structure is studied. A series of Fe/Cr/Gd structures with Cr spacer thicknesses of 4–30 Å is studied by SQUID magnetometry and ferromagnetic resonance in the temperature range 4.2–300 K. The obtained e...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2015-06, Vol.120 (6), p.1041-1054
Main Authors: Drovosekov, A. B., Kreines, N. M., Savitsky, A. O., Kravtsov, E. A., Blagodatkov, D. V., Ryabukhina, M. V., Milyaev, M. A., Ustinov, V. V., Pashaev, E. M., Subbotin, I. A., Prutskov, G. V.
Format: Article
Language:English
Subjects:
Analysis
ANTIFERROMAGNETISM
CHROMIUM
Classical and Quantum Gravitation
COMPARATIVE EVALUATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COUPLING
DIAGRAMS
Disorder
ELECTRONS
Elementary Particles
EXCHANGE INTERACTIONS
FERROMAGNETIC RESONANCE
Ferromagnetism
GADOLINIUM
IRON
LAYERS
MAGNETIC FIELDS
MAGNETIZATION
Order
OSCILLATIONS
Particle and Nuclear Physics
Phase Transition in Condensed System
Physics
Physics and Astronomy
Quantum Field Theory
Relativity Theory
Solid State Physics
SQUID DEVICES
TEMPERATURE DEPENDENCE
THICKNESS
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Summary:The effect of the chromium layer thickness on the magnetic state of an [Fe/Cr/Gd/Cr] n multilayer structure is studied. A series of Fe/Cr/Gd structures with Cr spacer thicknesses of 4–30 Å is studied by SQUID magnetometry and ferromagnetic resonance in the temperature range 4.2–300 K. The obtained experimental results are described in terms of an effective field model, which takes into account a biquadratic contribution to the interlayer coupling energy and a nonuniform magnetization distribution inside the gadolinium layer (which was detected earlier). Depending on the magnetic field and temperature, the following types of magnetic ordering are identified at various chromium layer thicknesses: ferromagnetic, antiferromagnetic, and canted ordering. A comparison of the experimental and calculated curves allowed us to determine the dependence of the bilinear ( J 1 ) and biquadratic ( J 2 ) exchange constants on chromium layer thickness t Cr . Weak oscillations at a period of about 18 Å are detected in the J 1 ( t Cr ) dependence in the range 8–30 Å. The interlayer coupling oscillations in the system under study are assumed to be related to the RKKY exchange interaction mechanism via the conduction electrons of Cr.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776115060059