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UID:DSC-22767
DTSTART;TZID=Europe/Berlin:20260512T110000
SEQUENCE:1778564233
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20260512T120000
URL:https://dresden-science-calendar.de/calendar/de/detail/22767
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Gusieva: Field-controlled thermal spin transport in rutile-type alt
 ermagnets
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr. Yuliia Gusieva\nInstitute of Speaker: Kurdyumov In
 stitute for Metal Physics of the NAS of Ukraine\nTopics:\n\n Location:\n  
 Name: IFW (D2E.27\, IFW Dresden)\n  Street: Helmholtzstraße 20\n  City: 0
 1069 Dresden\n  Phone: \n  Fax: \nDescription: The magnon-driven transport
  properties of a two-dimensional model of a d-wave altermagnet are investi
 gated. As a case study\, we consider a rutile with easy-planar anisotropy 
 (e.g.\, NiF2)\, where the sublattice magnetization vectors lie within the 
 xy-plane in the equilibrium state. An external magnetic field is applied p
 erpendicular to this plane\, along the z-axis. The model Hamiltonian accou
 nts for anisotropy\, Zeeman interaction\, and the complex structure of the
  Heisenberg exchange\, including ferromagnetic\, antiferromagnetic\, and s
 pecific altermagnetic exchange contributions. We computed the spectrum of 
 spin waves and found that altermagnetism renders magnons chiral. The alter
 magnetically-induced magnon magnetic moment is k-dependent\, and its distr
 ibution over the 1st Brillouin zone possesses d-wave symmetry for each mag
 non branch. The latter results in a magnon-driven spin current in response
  to an applied temperature gradient. The corresponding tensor of the therm
 al spin conductivity was derived from the transport Boltzmann equation wit
 hin the relaxation time approximation. The direction of the spin current i
 s determined by the direction of the temperature gradient relative to the 
 crystallographic axes. An important finding of this research is the possib
 ility of controlling the spin conductivity by the applied magnetic field. 
 We observe that at low temperatures\, the conductivity is governed by the 
 lowest-energy magnon mode\, and its temperature dependence follows a T2-la
 w. However\, for high temperatures\, the spin conductivity is temperature-
 independent\, and its value and sign are determined by the magnetic field.
  The field-controlled spin conductivity highlights the potential for tunab
 le magnonic and spin-caloritronic devices\, providing a robust mechanism f
 or controlling spin and heat currents at the nanoscale.
DTSTAMP:20260613T235407Z
CREATED:20260318T063927Z
LAST-MODIFIED:20260512T053713Z
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