Abstract
We demonstrate that antiferromagnetically coupled Fe/Cr/Fe trilayers can be magnetically patterned on the micrometer and sub-micrometer scale by irradiation with keV Ga + ions, which induces a local transition to ferromagnetic coupling due to direct contact between the two Fe layers via ferromagnetic pinholes. The irradiated areas act as ferromagnetic elements which are embedded into a surrounding, antiferromagnetically coupled trilayer. We also demonstrate that the magnetic properties of the elements fabricated by this method are size dependent, including a transition from multi-domain to single-domain configurations with decreasing element size, and we determine an effective intrinsic limit to the lateral resolution of this patterning technique.
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