Spatial manipulation of magnetic damping in ferromagnetic-antiferromagnetic films by ion irradiation


Spatial manipulation of magnetic damping in ferromagnetic-antiferromagnetic films by ion irradiation

McCord, J.; Strache, T.; Mönch, I.; Mattheis, R.; Fassbender, J.

The effective magnetic damping parameter in ferromagnetic-antiferromagnetic-ferromagnetic NiFe/IrMn/NiFe try-layer structures is set over a wide range. Ultra-thin antiferromagnetic systems in combination with low fluence Ni-ion irradiation are used to control the magnetic damping parameter by two independent mechanisms. Changing the ferromagnetic-antiferromagnetic interface the initially strongly increased damping parameter is reduced. Applying the method locally, results in a magnetic layer with spatially distributed regions of different damping. The overall relaxation time of the mixed property film is found to be a direct superposition of the individual relaxation time contributions and thus determined by the ratio of phases with individual damping parameter.

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Publ.-Id: 14877