Abstract
Magnetization dynamics in a series of FeCoB/Ru/FeCoB coupled samples were investigated using a critical-curve-like approach through angular dependent broadband microwave absorption spectroscopy. Two samples were selected in this study, with ferromagnetic and antiferromagnetic coupling between the FeCoB layers. The dynamic critical curves (DCC) were obtained by systematically probing the angular-dependent FMR absorption at selected frequencies for both samples to show the effect of layer coupling both as a function of frequency and of angle. The DCC representation has the advantage of offering a direct and complete visual representation of anisotropy, interactions, and magnetization dynamics effects. The DCC is compared with static critical curve measured using a reversible susceptibility experiment.
Highlights
Magnetically-coupled thin films have received much attention due to their importance in technological applications, and synthetic antiferromagnets (SAF) are of particular interest
Layer switching in SAF structures has been extensively characterized using the concept of critical curves (CC)[12,13,14] which is the locus of in-plane fields at which the irreversible magnetization reversal occurs
The behavior of magnetization switching is critically dependent on the time scale,[15] and it is very important to characterize SAF in conditions similar to the ones in which they are operating in devices
Summary
Magnetically-coupled thin films have received much attention due to their importance in technological applications, and synthetic antiferromagnets (SAF) are of particular interest. (Presented 3 November 2016; received 21 September 2016; accepted 26 November 2016; published online 1 March 2017)
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