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SUMMARY:Magnetic surface state on pure and iron-doped palladium thin films
DTSTART;VALUE=DATE-TIME:20220901T160000Z
DTEND;VALUE=DATE-TIME:20220901T162000Z
DTSTAMP;VALUE=DATE-TIME:20220826T122259Z
UID:indico-contribution-3712@indico.stfc.ac.uk
DESCRIPTION:Speakers: Thomas Prokscha (PSI)\nElemental palladium (Pd) is a
  well-known paramagnetic transition metal. Doping with iron impurities lea
 ds to giant magnetic moment formation and spin glass behavior. Pd surfaces
  often show different behavior than bulk Pd [1\,2]\, which is particularly
  relevant in research fields working with Pd nanomaterial\, such as for ex
 ample catalysis and spintronics. \nWe present depth-dependent transversal 
 field µSR measurements with low-energy muons (1 keV-25 keV) on 100 nm Pd 
 thin films at temperatures of 3.7-200 K and external magnetic fields of 10
 -330 mT. These measurements reveal a magnetic surface state both on pure e
 lemental Pd and on iron-doped (170 ppm) Pd samples. The surface state is c
 haracterized by an increased muon field and increased muon depolarization 
 rate at the sample surface and at the interface with the silicon substrate
 . The interior of all thin films shows bulk-like Pd properties\, in accord
 ance with earlier bulk-µSR measurements [3]. The surface is different fro
 m the bulk for all samples\, in one case\, we even found a strong indicati
 on for a paramagnetic to ferromagnetic phase transition at the surface. We
  argue that orbital moments induced at the surface / interface by localize
 d spins and charges are the most likely origin of the observed surface sta
 te [4]. \n[1] T. J. N. Hooper et al.\, Phys. Chem. Chemical Physics 20\, 2
 6734 (2018).\n[2] W. A. MacFarlane et al.\, Phys. Rev. B 88\, 144424 (2013
 ).\n[3] K. Nagamine et al.\, Phys. Rev. Lett. 38\, 99 (1977).\n[4] A. Hern
 ando et al.\, Phys. Rev. B 74\, 052403 (2006).\n\nhttps://indico.stfc.ac.u
 k/event/53/contributions/3712/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3712/
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