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Increased ultra high frequency magnetic susceptibility in nanopatterned nanolayers with strong exchange coupling

In this work, we report the magnetic properties of a set of magnetic multilayers whose particular nanostructure allows control of their in-plane, uniaxial magnetic anisotropy value and consequently the magnetic susceptibility measured at ultra high frequencies. Particularly, two sets of samples with the compositions ((Co15 nm-54°) (Cox nm-0°) (Ta6 nm-54°))n and ((Fe10 nm-54°) (Fex nm-0°) (Ta6 nm-54°))n where n is the number of trilayers. In every sample, the obliquely and normally deposited ferromagnetic layers were strongly exchange-coupled. Consequently, the value of the uniaxial in-plane magnetic anisotropy could be controlled by changing the thickness of the normally deposited layer (x). Subsequently, the magnetic susceptibility of the samples could be tailored. Thus, the ferromagnetic resonance frequency value may be controlled and increased to up to 6.3 GHz for the samples with larger magnetic anisotropy values.