Abstract
The ferromagnetic resonance frequency (fr) determines the maximum operating frequency of magnetic devices, nevertheless, it is very difficult to increase the fr(H=0) above 10 GHz by simply increasing the magnetic anisotropy field HK. In this study, a series of FeCoB/Ru/FeCoB sandwich trilayers with strong antiferromagnetic coupling were prepared by a compositional gradient sputtering method. As a result, the fr(0) increases from 13.69 to 22.68 GHz with the increase of B content, which can be attributed to the strong interlayer exchange coupling. In addition, a dramatic frequency shift over 16 GHz along easy-axis direction can be achieved simply via transition of magnetic configuration using a small magnetic field of the order of 100 Oe. This study provides an effective fabrication method to prepare self-biased soft magnetic films with ultrahigh resonance frequency for today’s microwave integrated circuits.
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