Fourfold anisotropy and structural behavior of epitaxial hcp Co/GaAs(001) thin films

E. Gu; M. Gester; R. J. Hicken; C. Daboo; M. Tselepi; S. J. Gray; J. A C Bland; L. M. Brown; T. Thomson; P. C. Riedi

doi:10.1103/PhysRevB.52.14704

Fourfold anisotropy and structural behavior of epitaxial hcp Co/GaAs(001) thin films

E. Gu, M. Gester, R. J. Hicken, C. Daboo, M. Tselepi, S. J. Gray, J. A C Bland, L. M. Brown, T. Thomson, P. C. Riedi

Research output: Contribution to journal › Article › peer-review

Abstract

Thin Cr-capped Co films (thickness 50150) have been grown epitaxially on GaAs(001) single-crystal substrates by molecular-beam epitaxy. In contrast to other investigations, transmission electron diffraction reveals that the epitaxial Co films have a hexagonal-close-packed (hcp) structure with the epitaxial relationships (1»21»0)[0001]Co(001)[110]GaAs and (1»21»0)[0001]Co(001)[1»10]GaAs, i.e., the c axis of each crystallite is assigned to either the in-plane [110] or the [1»10] direction of the GaAs(001) substrate. In-plane magneto-optical Kerr-effect hysteresis loops and Brillouin light-scattering measurements show that the thinnest epitaxial hcp Co film (50) has a dominant fourfold anisotropy with easy axes along the in-plane 100 directions and that a uniaxial anisotropy becomes dominant with increasing film thickness. We are able to account for the magnetic anisotropy properties of these epitaxial Co films in terms of their oriented hcp microstructure. © 1995 The American Physical Society.

Original language	English
Pages (from-to)	14704-14708
Number of pages	4
Journal	Physical Review B: covering condensed matter and materials physics
Volume	52
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.52.14704
Publication status	Published - 1995

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@article{8255d22eb9a34b83be2123e75462b6a2,

title = "Fourfold anisotropy and structural behavior of epitaxial hcp Co/GaAs(001) thin films",

abstract = "Thin Cr-capped Co films (thickness 50150) have been grown epitaxially on GaAs(001) single-crystal substrates by molecular-beam epitaxy. In contrast to other investigations, transmission electron diffraction reveals that the epitaxial Co films have a hexagonal-close-packed (hcp) structure with the epitaxial relationships (1»21»0)[0001]Co(001)[110]GaAs and (1»21»0)[0001]Co(001)[1»10]GaAs, i.e., the c axis of each crystallite is assigned to either the in-plane [110] or the [1»10] direction of the GaAs(001) substrate. In-plane magneto-optical Kerr-effect hysteresis loops and Brillouin light-scattering measurements show that the thinnest epitaxial hcp Co film (50) has a dominant fourfold anisotropy with easy axes along the in-plane 100 directions and that a uniaxial anisotropy becomes dominant with increasing film thickness. We are able to account for the magnetic anisotropy properties of these epitaxial Co films in terms of their oriented hcp microstructure. {\textcopyright} 1995 The American Physical Society.",

author = "E. Gu and M. Gester and Hicken, {R. J.} and C. Daboo and M. Tselepi and Gray, {S. J.} and Bland, {J. A C} and Brown, {L. M.} and T. Thomson and Riedi, {P. C.}",

note = "Gu, e gester, m hicken, rj daboo, c tselepi, m gray, sj bland, jac brown, lm thomson, t riedi, pc",

year = "1995",

doi = "10.1103/PhysRevB.52.14704",

language = "English",

volume = "52",

pages = "14704--14708",

journal = "Physical Review B: covering condensed matter and materials physics",

issn = "0163-1829",

publisher = "American Physical Society",

number = "20",

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TY - JOUR

T1 - Fourfold anisotropy and structural behavior of epitaxial hcp Co/GaAs(001) thin films

AU - Gu, E.

AU - Gester, M.

AU - Hicken, R. J.

AU - Daboo, C.

AU - Tselepi, M.

AU - Gray, S. J.

AU - Bland, J. A C

AU - Brown, L. M.

AU - Thomson, T.

AU - Riedi, P. C.

N1 - Gu, e gester, m hicken, rj daboo, c tselepi, m gray, sj bland, jac brown, lm thomson, t riedi, pc

PY - 1995

Y1 - 1995

N2 - Thin Cr-capped Co films (thickness 50150) have been grown epitaxially on GaAs(001) single-crystal substrates by molecular-beam epitaxy. In contrast to other investigations, transmission electron diffraction reveals that the epitaxial Co films have a hexagonal-close-packed (hcp) structure with the epitaxial relationships (1»21»0)[0001]Co(001)[110]GaAs and (1»21»0)[0001]Co(001)[1»10]GaAs, i.e., the c axis of each crystallite is assigned to either the in-plane [110] or the [1»10] direction of the GaAs(001) substrate. In-plane magneto-optical Kerr-effect hysteresis loops and Brillouin light-scattering measurements show that the thinnest epitaxial hcp Co film (50) has a dominant fourfold anisotropy with easy axes along the in-plane 100 directions and that a uniaxial anisotropy becomes dominant with increasing film thickness. We are able to account for the magnetic anisotropy properties of these epitaxial Co films in terms of their oriented hcp microstructure. © 1995 The American Physical Society.

AB - Thin Cr-capped Co films (thickness 50150) have been grown epitaxially on GaAs(001) single-crystal substrates by molecular-beam epitaxy. In contrast to other investigations, transmission electron diffraction reveals that the epitaxial Co films have a hexagonal-close-packed (hcp) structure with the epitaxial relationships (1»21»0)[0001]Co(001)[110]GaAs and (1»21»0)[0001]Co(001)[1»10]GaAs, i.e., the c axis of each crystallite is assigned to either the in-plane [110] or the [1»10] direction of the GaAs(001) substrate. In-plane magneto-optical Kerr-effect hysteresis loops and Brillouin light-scattering measurements show that the thinnest epitaxial hcp Co film (50) has a dominant fourfold anisotropy with easy axes along the in-plane 100 directions and that a uniaxial anisotropy becomes dominant with increasing film thickness. We are able to account for the magnetic anisotropy properties of these epitaxial Co films in terms of their oriented hcp microstructure. © 1995 The American Physical Society.

U2 - 10.1103/PhysRevB.52.14704

DO - 10.1103/PhysRevB.52.14704

M3 - Article

SN - 0163-1829

VL - 52

SP - 14704

EP - 14708

JO - Physical Review B: covering condensed matter and materials physics

JF - Physical Review B: covering condensed matter and materials physics

IS - 20

ER -

Fourfold anisotropy and structural behavior of epitaxial hcp Co/GaAs(001) thin films

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