Metallic ferrimagnets, where two antiferromagnetically coupled subsystems are not fully compensated, are of potential interest for applications ranging from skyrmion memories, to all-optical switching, to ionic gating that changes the magnetization compensation temperature. Rare earth-transition metal Metallic ferrimagnets show a high degree of tunability, but also show unusual and in some cases unexplained magnetic features, including very strong sensitivity to compositional and other disorder, "silent" magnetic components that are measurable via SQUID magnetometry, but do not contribute to electrical transport, and changes in magnetic anisotropy. In this talk I will present our group's exploration of these effects in Co-Gd alloys and bilayers, and our work to incorporate these materials in useful spintronic devices.
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