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Title: Effect of Ga{sup +} irradiation in molecular-beam epitaxy grown Pt/Co/Pt thin films studied by magneto-optic spectroscopy

In-depth profile changes induced by Ga{sup +} ion irradiation in Pt(5 nm)/Co(3.3 nm)/Pt(20 nm)/Mo(20 nm) sandwiches MBE grown on Al{sub 2}O{sub 3} substrates are deduced from complex magneto-optic polar Kerr effect (PMOKE) measurements at photon energies between 1 and 5 eV. The Ga{sup +} irradiation stimulates a redistribution of Pt and Co and leads to broadening of alloyed regions at Pt-Co and Co-Pt interfaces, which is evaluated using PMOKE spectra. The effect of four Ga{sup +} fluences D between zero and 6 × 10{sup 15} Ga{sup +}/cm{sup 2} was studied. The observed PMOKE azimuth rotation peak centered at 4.5 eV reaches the maximum of 0.42° at D = 1 × 10{sup 15} Ga{sup +}/cm{sup 2} and becomes thus enhanced by a factor of 3.2 with respect to that in the non-irradiated sample. At D = 6 × 10{sup 15} Ga{sup +}/cm{sup 2} the peak amplitude falls to 0.05°. To find the in-depth profile of Co concentration s in the sandwiches as a function of D, the PMOKE azimuth rotation and ellipticity spectra are compared with a multilayer model, where ideal flat interfaces are replaced by sequences of Co{sub s}Pt{sub 1−s} layers. The dependence on D is compared with that evaluated by simulations of the structural effects of ion irradiation. At the highest D, the irradiation producesmore » an almost complete erosion of the top Pt and Co accompanied by mixing at the Pt-Mo interface.« less
Authors:
;  [1] ; ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6]
  1. Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 12116 Prague (Czech Republic)
  2. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa (Poland)
  3. University of Bialystok, ul. Lipowa 41, 15-424 Bialystok (Poland)
  4. Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Postfach 510119, 01314 Dresden (Germany)
  5. Institute for Materials Science, Kiel University, Kaiserstr. 2, 24143 Kiel (Germany)
  6. Institute of Ion Beam Physics and Material Research, Helmholtz-Zentrum Dresden-Rossendorf, Postfach 510119, 01314 Dresden (Germany)
Publication Date:
OSTI Identifier:
22273898
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; ABSORPTION SPECTROSCOPY; ALUMINIUM OXIDES; COBALT; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; CONCENTRATION RATIO; GALLIUM IONS; INTERFACES; INTERMETALLIC COMPOUNDS; ION BEAMS; IRRADIATION; KERR EFFECT; LAYERS; MOLECULAR BEAM EPITAXY; PHOTONS; PHYSICAL RADIATION EFFECTS; PLATINUM; ROTATION; THIN FILMS