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Author (up) Dempsey, A.M.; Munoz, D.J.; Lithwick, Y. doi  openurl
  Title Outward Migration of Super-Jupiters Type
  Year 2021 Publication Astrophysical Journal Letters Abbreviated Journal Astrophys. J. Lett.  
  Volume 918 Issue 2 Pages L36  
  Keywords GIANT PLANETS; ECCENTRIC MODES; DENSITY WAVES; DISK; ACCRETION; EVOLUTION; SATELLITES; VISCOSITY; GAPS  
  Abstract Recent simulations show that giant planets of about 1 M (J) migrate inward at a rate that differs from the type II prediction. Here we show that at higher masses, planets migrate outward. Our result differs from previous ones because of our longer simulation times, lower viscosity, and boundary conditions that allow the disk to reach a viscous steady state. We show that, for planets on circular orbits, the transition from inward to outward migration coincides with the known transition from circular to eccentric disks that occurs for planets more massive than a few Jupiters. In an eccentric disk, the torque on the outer disk weakens due to two effects: the planet launches weaker waves, and those waves travel further before damping. As a result, the torque on the inner disk dominates, and the planet pushes itself outward. Our results suggest that the many super-Jupiters observed by direct imaging at large distances from the star may have gotten there by outward migration.  
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  ISSN 2041-8205 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000696692000001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1469  
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Author (up) Mellado, P. doi  openurl
  Title Intrinsic topological magnons in arrays of magnetic dipoles Type
  Year 2022 Publication Scientific Reports Abbreviated Journal Sci. Rep.  
  Volume 12 Issue 1 Pages 1420  
  Keywords SPIN-WAVES; PHASES; CHAIN; MODES  
  Abstract We study a simple magnetic system composed of periodically modulated magnetic dipoles with an easy axis. Upon adjusting the geometric modulation amplitude alone, chains and two-dimensional stacked chains exhibit a rich magnon spectrum where frequency gaps and magnon speeds are easily manipulable. The blend of anisotropy due to dipolar interactions between magnets and geometrical modulation induces a magnetic phase with fractional Zak number in infinite chains and end states in open one-dimensional systems. In two dimensions it gives rise to topological modes at the edges of stripes. Tuning the amplitude in two-dimensional lattices causes a band touching, which triggers the exchange of the Chern numbers of the volume bands and switches the sign of the thermal conductivity.  
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  Series Volume Series Issue Edition  
  ISSN 2045-2322 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000749232200035 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1539  
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Author (up) Urbina, F.; Franco, A.F.; Concha, A. doi  openurl
  Title Frequency dynamics of a chain of magnetized rotors: dumbbell model vs Landau-Lifshitz equation Type
  Year 2022 Publication Journal of Physics-Condensed Matter Abbreviated Journal J. Phys. Condens. Matter  
  Volume 34 Issue 48 Pages 485801  
  Keywords macroscopic system; magnetic rotors; frequency modes  
  Abstract During the past decades magnetic materials and structures that span several length scales have been of interest mainly due to their application in data storage and processing, flexible electronics, medicine, between others. From a microscopic point of view, these systems are typically studied using the Landau-Lifshitz equation (LLE), while approaches such as the dumbbell model are used to study macroscopic magnetic structures. In this work we use both the LLE and the dumbbell model to study spin chains of various lengths under the effect of a time dependent-magnetic field, allowing us to compare qualitatively the results obtained by both approaches. This has allowed us to identify and describe in detail several frequency modes that appear, with additional modes arising as the chain length increases. Moreover, we find that high frequency modes tend to be absorbed by lower frequency ones as the amplitude of the field increases. The results obtained in this work are of interest not only to better understand the behavior of the macroscopic spins chains, but also expands the available tools for qualitative studies of both macroscopic and microscopic versions of the studied system, or more complex structures such as junctions or lattices. This would allow to study the qualitative behavior of microscopic systems (e.g. nanoparticles) using macroscopic arrays of magnets, and vice versa.  
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  Series Volume Series Issue Edition  
  ISSN 0953-8984 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000866221700001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1672  
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