Bulletin of the American Physical Society
2016 Annual Meeting of the APS Mid-Atlantic Section
Volume 61, Number 16
Saturday–Sunday, October 15–16, 2016; Newark, Delaware
Session B2: Magnetism |
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Chair: SShirin Pourmiri, University of Delaware Room: Sharp Laboratory 130 |
Saturday, October 15, 2016 11:00AM - 11:36AM |
B2.00001: Magnetic properties of organic conductors: inelastic light scattering study. Invited Speaker: Natalia Drichko I'd like to show how quasi-two-dimensional molecular conductors can exhibit magnetic ground states predicted for the 1/2 Heisenberg antiferromagnet on a frustrated square and triangular lattices. The technique of inelastic light (Raman) scattering is particularly suitable for probing this physics. Using this technique, we follow the evolution of two-magnon spectra upon tuning the frustration of the lattice and charge properties of these materials. Additionally, we follow the charge distribution and dynamics on the molecular lattice using Raman vibrational spectroscopy. This allows us to understand the interplay of magnetic and charge degrees of freedom in a unique fashion. [Preview Abstract] |
Saturday, October 15, 2016 11:36AM - 11:48AM |
B2.00002: Geometric Magnetic Frustration in rock-salt ordered A$_{5}$BO$_{6}$ materials Jeremy P. Carlo, Shahab Derakhshan When the structural arrangement of ion in a material inhibits the development of magnetic order, geometric frustration occurs. Most often this occurs with antiferromagnetically correlated moments with triangular and tetrahedral configurations, and diverse ground states may arise depending on the balance between competing interactions. Hence there is great interest in finding new frustrated systems, to go beyond the well-studied pyrochlore, spinel, and Kagome lattice frustrated systems. Here we present materials based on the A$_{5}$BO$_{6}$ structure, which exhibit ``rock-salt'' order of magnetic B cations (Ru, Re or Os). Specimens with d$^{1}$, d$^{2}$, or d$^{3}$ configurations may be produced depending on A-site doping. These systems crystallize into either orthorhombic \textit{Fddd} or monoclinic \textit{C2/m} settings, each of which exhibits a distinct local magnetic environment, with diverse properties reported in various materials. Most recently, we have synthesized Li$_{4}$MgOsO$_{6}$ and Li$_{4}$MgReO$_{6}$, which may crystallize into either crystal system, making them ``Rosetta stones'' of sorts in elucidating the nature of frustration in these systems. We report here the results of magnetic and structural characterization of these materials. [Preview Abstract] |
Saturday, October 15, 2016 11:48AM - 12:24PM |
B2.00003: Room-temperature magnetic skyrmions in multilayers Invited Speaker: Xuemei Cheng Magnetic skyrmions are topological spin structures that are promising candidates for current-driven memory devices because of their high mobility at ultralow current densities. In magnetic multilayers, the interplay of various interactions, including the Heisenberg exchange, dipolar interactions, magnetic anisotropy, and interfacial Dzyaloshinskii-Moriya interactions, is key to forming and stabilizing magnetic skyrmions. In this work, the efficient conversion of chiral stripe domains into N\'{e}el skyrmions through a geometrical constriction patterned in a Ta/CoFeB/TaO$_{\mathrm{x}}$ trilayer film at room temperature is presented. This is enabled by an interfacial Dzyaloshinskii-Moriya interaction, and laterally divergent current-induced spin-orbit torques. The generation of magnetic skyrmions solely by the divergent spin-orbit torques through a nonmagnetic point contact is further demonstrated. When increasing the current density, the skyrmion Hall effect, the accumulation of skyrmions at one side of the device, is directly observed using magneto-optical Kerr effect microscopy. [Preview Abstract] |
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