TY - JOUR
T1 - Molecular beam epitaxial growth and properties of CoFe2O4 on MgO(0 0 1)
AU - Chambers, S. A.
AU - Farrow, R. F.C.
AU - Maat, S.
AU - Toney, M. F.
AU - Folks, L.
AU - Catalano, J. G.
AU - Trainor, T. P.
AU - Brown, G. E.
N1 - Funding Information:
The PNNL portion of the research described in this paper was performed in the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the US Department of Energy's Office of Biological and Environmental Research and located at PNNL.
PY - 2002/4
Y1 - 2002/4
N2 - We have grown single-crystal Co ferrite (CoFe2O4) on MgO(0 0 1) by oxygen-plasma-assisted molecular beam epitaxy (OPA-MBE), and have characterized the composition, structure, surface morphology, and magnetic properties by a number of methods. The as-grown OPA-MBE material forms a perfect inverse spinel, in which all Co is in the 2+ formal oxidation state, and occupies octahedral sites within the cation sublattice. The OPA-MBE film surfaces are very flat, with mean roughnesses of only a few Å, and exhibit large, stable magnetic domains. The measured moment per unit volume is 250 emu/cm3, and the saturation magnetization for films in the 1000 Å film thickness range is ∼60% of that of bulk Co ferrite. The material also exhibits strain-dependent magnetic anisotropy that can be understood by considering the various contributions to the total magnetic energy. The overall quality of epitaxial Co ferrite grown on MgO by OPA-MBE is superior in every respect to that obtained using pulsed laser deposition as the growth method.
AB - We have grown single-crystal Co ferrite (CoFe2O4) on MgO(0 0 1) by oxygen-plasma-assisted molecular beam epitaxy (OPA-MBE), and have characterized the composition, structure, surface morphology, and magnetic properties by a number of methods. The as-grown OPA-MBE material forms a perfect inverse spinel, in which all Co is in the 2+ formal oxidation state, and occupies octahedral sites within the cation sublattice. The OPA-MBE film surfaces are very flat, with mean roughnesses of only a few Å, and exhibit large, stable magnetic domains. The measured moment per unit volume is 250 emu/cm3, and the saturation magnetization for films in the 1000 Å film thickness range is ∼60% of that of bulk Co ferrite. The material also exhibits strain-dependent magnetic anisotropy that can be understood by considering the various contributions to the total magnetic energy. The overall quality of epitaxial Co ferrite grown on MgO by OPA-MBE is superior in every respect to that obtained using pulsed laser deposition as the growth method.
KW - Cobalt ferrite
KW - Magnetic and structural properties
KW - Molecular beam epitaxy
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U2 - 10.1016/S0304-8853(02)00039-2
DO - 10.1016/S0304-8853(02)00039-2
M3 - Article
AN - SCOPUS:0036531620
VL - 246
SP - 124
EP - 139
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 1-2
ER -