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We report on a comprehensive study of the interlayer exchange coupling in CoFe(5nm)/Ru(x)/CoFe(8nm) trilayers (x=0.8...2.8 nm), using broadband ferromagnetic resonance. A systematic frequency dependence of the field separation between the acoustic and optic modes is found, which is caused by different effective magnetizations of the two ferromagnetic layers. Hence, it is shown that the broadband measurements are vital for reducing the systematic error margins in the determination of interlayer exchange coupling using ferromagnetic resonance. We have also investigated the temperature dependence of the interlayer exchange coupling and compare our results with existing theories. It is shown that models which take into account the temperature dependence due to thermal excitations of spin waves within the ferromagnetic layers, have a considerably better agreement with the experiment than models solely based on spacer and interface contributions to the temperature dependence.

physical review applied

Interlayer Exchange Coupling in Asymmetric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mi>Co</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Fe</mml:mi></mml:mrow><mml:mo>/</mml:mo><mml:mi>Ru</mml:mi><mml:mo>/</mml:mo><mml:mrow><mml:mi>Co</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Fe</mml:mi></mml:mrow></mml:mrow></mml:math> Trilayers Investigated with Broadband Temperature-Dependent Ferromagnetic Resonance

Interlayer Exchange Coupling in Asymmetric Co−Fe/Ru/Co−Fe Trilayers Investigated with Broadband Temperature-Dependent Ferromagnetic Resonance