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SUMMARY:Insights into skymion-hosting materials from implanted muons
DTSTART;VALUE=DATE-TIME:20220829T102000Z
DTEND;VALUE=DATE-TIME:20220829T104000Z
DTSTAMP;VALUE=DATE-TIME:20220826T105707Z
UID:indico-contribution-3646@indico.stfc.ac.uk
DESCRIPTION:Speakers: Tom Lancaster (Durham University)\nLow-dimensional m
 agnetism continues to be of great theoretical and experimental interest\, 
 as reduced dimensionality supports strong fluctuations that can result in 
 novel states and excitations. One theme in this field is the understanding
  of magnetism in reduced dimensions using notions from topology. Examples 
 include topological objects such as walls\, vortices and skyrmions\, which
  can potentially exist in the spin textures of a range of systems. In rece
 nt years\, the experimental discovery of skyrmions in magnetic materials a
 nd of their self-organization into a skyrmion lattice\, together with thei
 r potential for use as high density\, low-energy sensors and magnetic stor
 age\, has made the investigation of such magnetic topological objects part
 icularly important$^{1}$. \n\nHere we report insights gained from our muon
 -spin spectroscopy ($\\mu^{+}$SR) investigations of materials with topolog
 ical excitations\, including: (i) order and dynamics in GaV$_{4}$S$_{8-y}$
 Se$_{y}$\, a system hosting Néel skyrmions in which $\\mu^{+}$SR shows ho
 w their stability is enhanced through chemical substitution and the applic
 ation of pressure$^{2}$\; (ii) the skyrmion-hosting multilayer system Ta/[
 CoFeB/MgO/Ta]$_{16}$\, where low-energy $\\mu^{+}$SR uniquely reveals chan
 ges in the magnetic structure with depth into the multilayer stack\; (iii)
  Cr$_{1/3}$NbS$_{2}$\, which hosts topological soliton excitations\, and w
 here we show that the magnetism is determined directly by features in the 
 electronic bandstructure$^{3}$. These investigations demonstrate how the c
 ombination of $\\mu^{+}$SR\, magnetometry and electronic structure calcula
 tions\, both to determine muon sites and more generally\, can be used to a
 chieve additional insights into the underlying magnetic behaviour.\n\n$^{1
 }$T. Lancaster\, Contemp. Phys. **60**\, 246 (2019). $^{2}$T.J. Hicken *et
  al*.\, Phys. Rev. Research **2**\, 032001(R) (2020)\; Phys. Rev B **105**
 \, 134414 (2022). $^{3}$T.J. Hicken  *et al*. Phys. Rev. B **105**\, L0604
 07 (2022).\n\nhttps://indico.stfc.ac.uk/event/53/contributions/3646/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3646/
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