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This content will become publicly available on July 6, 2019

Title: Unraveling thickness-dependent spin relaxation in colossal magnetoresistance manganite films

In this paper, we used ultrafast optical spectroscopy to study photoinduced spin relaxation in 10–100 nm thick La 0.7Ca 0.3MnO 3 films. The spin-lattice relaxation time displays a strong dependence on thickness below the Curie temperature. Our simulations show that the observed thickness-dependent relaxation results from much faster thermal decay through the substrate in thinner films that leads to artificially faster demagnetization. Furthermore, we provide an analytical approach to gain insight into the spin-lattice relaxation time for highly thermal dissipative films. Finally, our study strongly suggests that careful consideration of the influence of transient thermal variations on photoinduced demagnetization is mandatory when incorporating absorbing thin magnetic films into heterostructures and devices.
ORCiD logo [1] ;  [2] ; ORCiD logo [2] ;  [3] ;  [2] ;  [2]
  1. National Chiao Tung Univ., Hsinchu (Taiwan). Dept. of Electrophysics. Center for Emergent Functional Matter Science
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. at Buffalo, NY (United States). Dept. of Materials Design and Innovation; Konkuk Univ., Seoul (Korea, Republic of). Division of Quantum Phases and Devices. Dept. of Physics
Publication Date:
Report Number(s):
Journal ID: ISSN 0003-6951
Grant/Contract Number:
AC52-06NA25396; 104-2112-M-009-023-MY3
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 1; Journal ID: ISSN 0003-6951
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); National Chiao Tung Univ., Hsinchu (Taiwan)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); Ministry of Science and Technology (MOST) (Taiwan); Ministry of Education (MOE) (Taiwan)
Country of Publication:
United States
36 MATERIALS SCIENCE; electronic transport; phase transitions; thin films; magnetic resonance imaging; garnet; heterojunctions; thermal diffusion; optical spectroscopy
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1459235