Evidence for nanoscale two-dimensional Co clusters in CoPt3 films with perpendicular magnetic anisotropy

Cross, J. O.; Newville, M.; Maranville, B. B.; Bordel, C.; Hellman, F.; Harris, V. G.

doi:10.1088/0953-8984/22/14/146002

Title: Evidence for nanoscale two-dimensional Co clusters in CoPt₃ films with perpendicular magnetic anisotropy

Journal Article · Wed Mar 17 00:00:00 EDT 2010 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/22/14/146002· OSTI ID:1511318

Cross, J. O. ^[1]; Newville, M. ^[2]; Maranville, B. B. ^[3]; Bordel, C. ^[4]; Hellman, F. ^[5]; Harris, V. G. ^[6]

Univ. of Washington, Seattle, WA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Chicago, IL (United States)
Univ. of California, San Diego, CA (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Univ. of California, Berkeley, CA (United States)
Univ. of California, San Diego, CA (United States); Univ. of California, Berkeley, CA (United States)
Northeastern Univ., Boston, MA (United States)

The length scale of the local chemical anisotropy responsible for the growth-temperature-induced perpendicular magnetic anisotropy of face-centered cubic CoPt₃ alloy films was investigated using polarized extended x-ray absorption fine structure (EXAFS). These x-ray measurements were performed on a series of four (111) CoPt₃ films epitaxially grown on (0001) sapphire substrates. The EXAFS data show a preference for Co-Co pairs parallel to the film plane when the film exhibits magnetic anisotropy, and random chemical order otherwise. Furthermore, atomic pair correlation anisotropy was evidenced only in the EXAFS signal from the next neighbors to the absorbing Co atoms and from multiple scattering paths focused through the next neighbors. This suggests that the Co clusters are no more than a few atoms in extent in the plane and one monolayer in extent out of the plane. Our EXAFS results confirm the correlation between perpendicular magnetic anisotropy and two-dimensional Co segregation in CoPt₃ alloy films, and establish a length scale on the order of 10 for the Co clusters.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 )

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1511318

Journal Information:: Journal of Physics. Condensed Matter, Vol. 22, Issue 14; ISSN 0953-8984

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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