Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films

Charilaou, M.; Bordel, C.; Berche, P. -E.; Maranville, B. B.; Fischer, P.; Hellman, F.

doi:10.1103/PhysRevB.93.224408

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

Journal Article · Tue Jun 07 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.224408· OSTI ID:1456946

Charilaou, M. ^[1]; Bordel, C. ^[2]; Berche, P. -E. ^[3]; Maranville, B. B. ^[4]; Fischer, P. ^[5]; Hellman, F. ^[6]

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

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 $$M$$.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Rouen (France); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Sponsoring Organization:: IT Resource Center of Haute Normandie (CRIHAN) (France); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; FG02-04ER46100

OSTI ID:: 1456946

Alternate ID(s):: OSTI ID: 1256117

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 93; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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