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BEGIN:VEVENT
DTSTAMP:20260428T050349Z
DTSTART;VALUE=DATE-TIME:20190429T130000
DTEND;VALUE=DATE-TIME:20190429T140000
SUMMARY:Joseph Barker (Leeds)
TZID:Europe/London
UID:20190429-8a1785d76a11d297016a50e9a39b1fe7@warwick.ac.uk
CREATED:20190425T090745Z
DESCRIPTION:Atomistic spin dynamics with a quantum thermostat Atomistic s
 pin dynamics is a common method used to calculate dynamics and thermodyn
 amics of magnets. It is a classical formalism based on the Heisenberg Ha
 miltonian. Magnetic materials can be modelled in exquisite detail\, with
  the exchange and additional Hamiltonian terms parameterised from ab ini
 tio or experiments. It is a good approach for modelling complex magnets 
 where simple magnon band theories can be inadequate. Even though such co
 mplex models can be built\, the formalism still lacks quantitative power
  because classical (Rayleigh-Jeans) statistics are generally used\, whic
 h are inappropriate at low temperatures. This is equivalent to the ultra
 violet catastrophe of black-body physics\, but for magnons. We have inco
 rporated a quantum thermostat into atomistic spin dynamics so that the m
 agnons now obey Planck statistics. This allows truly quantitative calcul
 ations to be performed. We apply this method to calculate thermodynamic 
 and magnon transport properties in the complex ferrimagnet yttrium iron 
 garnet (YIG). This magnetic insulator is used across many research field
 s due to its ultra-low Gilbert damping. The large unit cell\, containing
  20 magnetic atoms cannot be approximated easily\, as we will show. We h
 ave calculated thermodynamic quantities of interest in spintronicsā€”such 
 as the magnon heat capacity and magnon spin conductivity. These are extr
 emely difficult to measure in experiments and often limited to only the 
 low temperature regime. Our calculations at low temperature show excelle
 nt agreement with experimental measurements. Calculating beyond this reg
 ime we show the deficiency of analytic methods in such complex systems\,
  due to their crude approximation of the magnon spectrum. The code I dev
 elop is now about 10 years old and began in the days of CUDA 0.7. Time p
 ermitting I will also give a brief description of how we use GPUs to acc
 elerate our calculations.
LOCATION:PS0.17 Physical Sciences
CATEGORIES:
LAST-MODIFIED:20190425T090745Z
ORGANIZER;CN=Peter Brommer:
END:VEVENT
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