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SUMMARY:Computational modelling of itinerant electrons and fluctuating loc
 al moments in magnetic materials - permanent magnets\, caloric effects and
  spintronics - Prof. Julie Staunton\, University of Warwick
DTSTART:20190516T131500Z
DTEND:20190516T141500Z
UID:TALK115657@talks.cam.ac.uk
CONTACT:Bartomeu Monserrat
DESCRIPTION:When external stimuli or varying temperature alter its magneti
 c properties a metal’s complex electronic fluid with its emergent magnet
 ic 'local moments' transforms. The coupled itinerant electrons and more lo
 calised spin degrees of freedom have a profound effect on structure\, elec
 tronic transport\, and so on.  Over the last few years the Density Functio
 nal Theory-based Disordered Local Moment Theory (DLM) has proved to be a s
 uccessful method [1-4] to describe magnetic materials from this standpoint
 .  The theory will be described and shown to provide a free energy functio
 n of local moment order parameters\, determined by and affecting the under
 lying spin-polarised electronic structure of a material. The versatility o
 f the approach will be illustrated by recent applications to the magnetic 
 order and its link to the Fermi surfaces of the heavy rare earth metals [3
 ]\, the tricritical metamagnetism in frustrated antiferromagnets [5\,6] wi
 th rich magnetic-strain phase diagrams and associated caloric effects\, an
 d finally to the magnetic properties of rare earth - transition metal perm
 anent magnets such as SmCo5 [4\,5] focussing on intrinsic temperature depe
 ndent ferrimagnetism\, saturation magnetisation and magnetic anisotropy.\n
 \n[1] B.L.Gyorffy et al.\, J.Phys. F 15\, 1337\, (1985)\n[2] J.B. Staunton
  et al.\, Phys. Rev. B 89\,054427\, (2014)\n[3] E. Mendive-Tapia and J. B.
  Staunton\, Phys. Rev. Lett. 118\, 197202\, (2017)\n[4] C. E. Patrick et a
 l.\, Phys. Rev. Lett. 120\, 097202\, (2018)\n[5] C. E. Patrick and J.B. St
 aunton\, Phys. Rev. B 97\, 224415 (2018)\n[6] J. Zemen\, E. Mendive-Tapia 
 et al.\, Phys. Rev. B 95\, 184438\, (2017).\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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