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Magnetization reversal of antiferromagnetically coupled (Co/Ni) and (Co/Pt) multilayers

Journal article
Authors A. Al Subhi
R. Sbiaa
Mojtaba Ranjbar
Johan Åkerman
Published in Journal of Magnetism and Magnetic Materials
Volume 479
Pages 27-31
ISSN 0304-8853
Publication year 2019
Published at Department of Physics (GU)
Pages 27-31
Language en
Links dx.doi.org/10.1016/j.jmmm.2019.02.0...
Keywords perpendicular-anisotropy, media, layers, spin
Subject categories Magnetism

Abstract

Magnetization reversal and magnetic exchange coupling of (Co/Ni)( x N)/Ru/(Co/Pt)(x12) were investigated as a function of the temperature. The number of repeats N of the soft multilayer (Co/Ni) was varied from 4 to 8 bilayers while the number of repeats of the hard bilayers (Co/Pt) was fixed to 12. Two steps hysteresis loops were observed for coupled structure with only 4 repeats of (Co/Ni) in a wide range of temperature (25-300 K). From the shift of the minor hysteresis loop, the antiferromagnetic exchange coupling H-ex was measured and then the interlayer exchange coupling J(ex) was calculated. A non-monotonous dependence of J(ex) with temperature was observed for N = 4 with a maximum J(ex) of 0.13 erg/cm(2) at 150 K. The annealing process performed on the same structure confirms the unusual behavior of interlayer exchange coupling J(ex). As the repetition number N increases to 8 bilayers the two steps hysteresis loops disappeared in the investigated temperature range, however a small kink appeared in the range of 125 and 225 K for the case of 6 bilayers. From the analysis of the coupled and uncoupled structures, it seems that the dipolar energy overcomes the antiferromagnetic coupling for thicker (Co/Ni) multilayer.

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