Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic 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:
-
- 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
- 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)
- Univ. of Rouen (France)
- Univ. of California, San Diego, CA (United States). Dept. of Physics
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Santa Cruz, CA (United States). Dept. of Physics
- 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); 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. https://doi.org/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. https://doi.org/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 = {Tue Jun 07 00:00:00 EDT 2016},
month = {Tue Jun 07 00:00:00 EDT 2016}
}
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Figures / Tables:
FIG. 1: Intrinsic uniaxial magnetic anisotropy at 300 K vs. Pt layer thickness for Co/Pt multilayers with various Co layer thicknesses.
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