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Title: Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt 3 films

Abstract

In this paper, magnetic properties of thin Co/Pt multilayers have been investigated in order to study the dependence of magnetization $M$, uniaxial anisotropy $${K}_{u}$$, and Curie temperature $${T}_{\mathrm{C}}$$ on the multilayer thickness, composition, and structure. A comparison between epitaxial submonolayer multilayers and epitaxial fcc $${\mathrm{CoPt}}_{3}$$ alloy films with large perpendicular magnetic anisotropy (PMA) attributed to growth-induced Co clustering reveals significant differences in the temperature dependence of magnetization $M(T)$, despite the presence of thin planar Co platelets in both cases. Even the thinnest discontinuous multilayered structure shows a Langevin-like $M(T)$, while the alloy films with PMA show a broadened and enhanced $M(T)$ indicating a distribution of environments, including monolayer Co platelets separated by only 1-2 layers of Pt. These differences have been reproduced in Monte Carlo simulations, and are shown to be due to different distributions of Co-Co and Co-Pt nearest neighbors. Finally, the relatively uniform Co-Co coordination of even a discontinuous rough multilayer produces a Langevin-like $M(T)$, whereas the broader distribution associated with platelets in the PMA films results in a nearly linear $T$ dependence of $M$.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics; ETH Zurich (Switzerland). Dept. of Materials
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics; Univ. of Rouen (France)
  3. Univ. of Rouen (France)
  4. Univ. of California, San Diego, CA (United States). Dept. of Physics
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Santa Cruz, CA (United States). Dept. of Physics
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics; Univ. of California, San Diego, CA (United States). Dept. of Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Univ. of Rouen (France)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); IT Resource Center of Haute Normandie (CRIHAN) (France)
OSTI Identifier:
1456946
Alternate Identifier(s):
OSTI ID: 1256117
Grant/Contract Number:  
AC02-05CH11231; FG02-04ER46100; AC02-05-CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ferroelectricity; magnetism; multilayer thin films; Monte Carlo methods

Citation Formats

Charilaou, M., Bordel, C., Berche, P. -E., Maranville, B. B., Fischer, P., and Hellman, F. Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.224408.
Charilaou, M., Bordel, C., Berche, P. -E., Maranville, B. B., Fischer, P., & Hellman, F. Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films. United States. doi:10.1103/PhysRevB.93.224408.
Charilaou, M., Bordel, C., Berche, P. -E., Maranville, B. B., Fischer, P., and Hellman, F. Tue . "Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films". United States. doi:10.1103/PhysRevB.93.224408. https://www.osti.gov/servlets/purl/1456946.
@article{osti_1456946,
title = {Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films},
author = {Charilaou, M. and Bordel, C. and Berche, P. -E. and Maranville, B. B. and Fischer, P. and Hellman, F.},
abstractNote = {In this paper, magnetic properties of thin Co/Pt multilayers have been investigated in order to study the dependence of magnetization $M$, uniaxial anisotropy ${K}_{u}$, and Curie temperature ${T}_{\mathrm{C}}$ on the multilayer thickness, composition, and structure. A comparison between epitaxial submonolayer multilayers and epitaxial fcc ${\mathrm{CoPt}}_{3}$ alloy films with large perpendicular magnetic anisotropy (PMA) attributed to growth-induced Co clustering reveals significant differences in the temperature dependence of magnetization $M(T)$, despite the presence of thin planar Co platelets in both cases. Even the thinnest discontinuous multilayered structure shows a Langevin-like $M(T)$, while the alloy films with PMA show a broadened and enhanced $M(T)$ indicating a distribution of environments, including monolayer Co platelets separated by only 1-2 layers of Pt. These differences have been reproduced in Monte Carlo simulations, and are shown to be due to different distributions of Co-Co and Co-Pt nearest neighbors. Finally, the relatively uniform Co-Co coordination of even a discontinuous rough multilayer produces a Langevin-like $M(T)$, whereas the broader distribution associated with platelets in the PMA films results in a nearly linear $T$ dependence of $M$.},
doi = {10.1103/PhysRevB.93.224408},
journal = {Physical Review B},
number = 22,
volume = 93,
place = {United States},
year = {2016},
month = {6}
}

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Works referenced in this record:

Precise determination of the bond percolation thresholds and finite-size scaling corrections for the sc, fcc, and bcc lattices
journal, January 1998

  • Lorenz, Christian D.; Ziff, Robert M.
  • Physical Review E, Vol. 57, Issue 1, p. 230-236
  • DOI: 10.1103/PhysRevE.57.230