Tue14Sep20214:00 pmLewis Hall 101
Colloquium: Designing Chiral Magnetism Through Interface Engineering – From Skyrmions to Magnetic Memory
Department of Physics and Materials Science
University of Memphis
Designing Chiral Magnetism Through Interface Engineering – From Skyrmions to Magnetic Memory
Chirality is a fundamental concept in condensed matter physics. The ability to control magnetic chirality through broken symmetry at interfaces has led to the development of new devices governed by control of the local spin structure. One such structure, the skyrmion, a result of the Dzyaloshinskii-Moriya interaction (DMI), has been proposed as both a building block of new spintronic devices and as a tool to probe a variety of novel electrical transport phenomena. In this talk, I will describe our efforts to design chiral structures including skyrmions with tunable stability and dynamics by modifying the interface properties in both heavy metal/ferromagnet bi- and multilayers. We find that by tuning the heavy metal and ferromagnetic layer thicknesses and repetition numbers, we can control the skyrmion boundary structure, which has profound effects on its dynamics. This includes the first observation of an interlayer DMI in which a breaking of domain wall degeneracy can be used to prevent off-axial current driven skyrmion motion known as the skyrmion Hall effect. I also discuss our work developing new techniques in which to quantify magnetic phenomena in these materials.
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Meeting ID: 919 282 27187