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Title: Enhanced magnetic damping in La{sub 0.7}Sr{sub 0.3}MnO{sub 3} capped by normal metal layer

La{sub 0.7}Sr{sub 0.3}MnO{sub 3}(LSMO) and Pt capped La{sub 0.7}Sr{sub 0.3}MnO{sub 3} 20 nm thick films have been grown on SrTiO{sub 3} substrates by pulsed laser deposition. Microstrip line ferromagnetic resonance (MS-FMR) technique is then used to investigate their magnetic dynamic properties and to particularly measure the damping constant based on the frequency dependence of microwave absorption linewidth. The results show that the effective damping constant of LSMO(20nm)/Pt(5.5nm) is three times larger than that of LSMO(20nm) and the films present weak in-plane uniaxial anistropy. The enhancement of the magnetic damping constant due to the capping of Pt is the manifestaction of the generation of spin current in Pt layer. Furthermore, the spin current induces an inverse spin Hall effect (ISHE) in LSMO(20nm)/Pt(5.5nm) system, measured using the FMR in cavity with 9.8 GHz excitation frequency. The linear dependence of ISHE on microwave power validates the mechenism of spin pumping in this bilayer system.
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [1] ;  [4]
  1. Deparment of Physics, National Taiwan University, Taipei 10617, Taiwan (China)
  2. (China)
  3. LSPM (CNRS-UPR 3407), Université Paris 13, Sorbonne Paris Cité, 99 avenue Jean-Baptiste Clément, 93430 Villetaneuse (France)
  4. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan (China)
Publication Date:
OSTI Identifier:
22492357
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 9; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ENERGY BEAM DEPOSITION; EXCITATION; FERROMAGNETIC RESONANCE; FILMS; FREQUENCY DEPENDENCE; GHZ RANGE; HALL EFFECT; LANTHANUM COMPOUNDS; LASER RADIATION; LAYERS; MANGANATES; MICROWAVE RADIATION; PLATINUM; PULSED IRRADIATION; SPIN; STRONTIUM TITANATES; SUBSTRATES