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Title: Topological spin-transfer drag driven by skyrmion diffusion

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; Related Information: CHORUS Timestamp: 2016-07-25 18:09:50; Journal ID: ISSN 2469-9950
American Physical Society
Country of Publication:
United States

Citation Formats

Ochoa, Héctor, Kim, Se Kwon, and Tserkovnyak, Yaroslav. Topological spin-transfer drag driven by skyrmion diffusion. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.024431.
Ochoa, Héctor, Kim, Se Kwon, & Tserkovnyak, Yaroslav. Topological spin-transfer drag driven by skyrmion diffusion. United States. doi:10.1103/PhysRevB.94.024431.
Ochoa, Héctor, Kim, Se Kwon, and Tserkovnyak, Yaroslav. 2016. "Topological spin-transfer drag driven by skyrmion diffusion". United States. doi:10.1103/PhysRevB.94.024431.
title = {Topological spin-transfer drag driven by skyrmion diffusion},
author = {Ochoa, Héctor and Kim, Se Kwon and Tserkovnyak, Yaroslav},
abstractNote = {},
doi = {10.1103/PhysRevB.94.024431},
journal = {Physical Review B},
number = 2,
volume = 94,
place = {United States},
year = 2016,
month = 7

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevB.94.024431

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  • We analyze the topological Hall conductivity experienced by conduction electrons whose spins are strongly coupled to axially symmetric spin textures, such as magnetic vortex and skyrmion of types I and II, theoretically by gauge theory, and numerically via micromagnetic simulations. The numerical results are in agreement with the theoretical predictions. Divergence between the two is seen when the vortex/skyrmion core radius is comparable or larger than the element size, and when the skyrmion configuration breaks down at high Dzyaloshinskii-Moriya interaction strength.
  • Magnetic skyrmions are topologically protected spin textures with attractive properties suitable for high-density and low-power spintronic device applications. Much effort has been dedicated to understanding the dynamical behaviours of the magnetic skyrmions. However, experimental observation of the ultrafast dynamics of this chiral magnetic texture in real space, which is the hallmark of its quasiparticle nature, has so far remained elusive. Here, we report nanosecond-dynamics of a 100nm-diameter magnetic skyrmion during a current pulse application, using a time-resolved pump-probe soft X-ray imaging technique. We demonstrate that distinct dynamic excitation states of magnetic skyrmions, triggered by current-induced spin-orbit torques, can be reliablymore » tuned by changing the magnitude of spin-orbit torques. Our findings show that the dynamics of magnetic skyrmions can be controlled by the spin-orbit torque on the nanosecond time scale, which points to exciting opportunities for ultrafast and novel skyrmionic appl ications in the future.« less
  • We numerically investigate the spin motive force (SMF) driven by the dynamics of a Skyrmion lattice. The rotating mode of the Skyrmion core excited by the AC magnetic field induces the large spin-dependent electric field near the core. Due to the collective dynamics of Skyrmion lattice, the measurable voltage is enhanced by the cascade effect of the SMF. The amplitude of the AC voltage is estimated to 30 μV in a macroscopic sample, where 100 Skyrmions exist between two probes. We also investigate the SMF due to the dynamics of the helical magnetic state, where the enhancement of the SMF doesmore » not occur.« less
  • We investigate the conditions for nanocontact spin-transfer oscillators (NC-STOs) that allow for stabilization of a skyrmion. Emphasis is made on the breathing mode, which can be regarded as a source of microwave generation. Micromagnetic simulations of NC-STOs with varying parameters have been performed, with the resulting magnetization plotted in the form of phase diagrams. It is found that control of spin wave mode in conventional STOs can be applied to skyrmion-based STOs.