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Topology of spin meron pairs in coupled Ni/Fe/Co/Cu(001) disks
Tan, A.,Li, J.,Scholl, A.,Arenholz, E.,Young, A. T.,Li, Q.,Hwang, C.,Qiu, Z. Q. American Physical Society 2016 Physical review. B Vol.94 No.1
<P>The meron is a special topological object that carries only one-half of the topological charge unit. In condensed matter physics, a spin meron corresponds to one-half of a spin skyrmion. As compared to the many fascinating topological properties of skyrmion materials, little is known of the properties of spin merons especially about their formation. It was confirmed only recently that hedgehog merons could exist in pairs with opposite helicities via a spin flux closure. However, it is unclear whether a single hedgehog meron could ever exist by pairing with another type of meron. Using element-resolved magnetic imaging measurements on epitaxial trilayer disks, we show that a spin meron with a full range of helicity, including the hedgehog meron, can be stabilized by pairing with another vortex meron with a fine tuning of the magnetic coupling between the two merons. Furthermore, the meron divergence is fully controlled by the polarity of the vortex meron, independent of the vortex helicity.</P>
Wu, J,Carlton, D,Oelker, E,Park, J S,Jin, E,Arenholz, E,Scholl, A,Hwang, Chanyong,Bokor, J,Qiu, Z Q IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.34
<P>Epitaxial Py/Cu/Co/Cu(001) trilayers were patterned into micron sized disks and imaged using element-specific photoemission electron microscopy. By varying the Cu spacer layer thickness, we study how the coupling between the two magnetic layers influences the formation of magnetic vortex states. We find that while the Py and Co disks form magnetic vortex domains when the interlayer coupling is ferromagnetic, the magnetic vortex domains of the Py and Co disks break into anti-parallel aligned multidomains when the interlayer coupling is antiferromagnetic. We explain this result in terms of magnetic flux closure between the Py and Co layers for the antiferromagnetic coupling case.</P>
Determination of the Fe magnetic anisotropies and the CoO frozen spins in epitaxial CoO/Fe/Ag(001)
Li, J.,Meng, Y.,Park, J. S.,Jenkins, C. A.,Arenholz, E.,Scholl, A.,Tan, A.,Son, H.,Zhao, H. W.,Hwang, Chanyong,Wu, Y. Z.,Qiu, Z. Q. American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.84 No.9