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- W1574803802 abstract "Using neutron diffraction, x-ray scattering, and bulk-magnetization methods, we have characterized the magnetic structure for ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$/NiO superlattices grown by molecular-beam epitaxy. The antiferromagnetic NiO order extends through several superlattice bilayers, even though the intervening ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$ layers are ferrimagnetic. The structural and magnetic coherence of the ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$ is limited by interfacial stacking faults between adjacent layers resulting from symmetry differences between the NiO rocksalt and ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$ spinel unit cell. The diffraction data manifest this interfacial disorder via a broadening of selected reflections. Using a structure-factor model based upon a Hendricks-Teller description of the random-stacking sequence, we have separated the magnetic order parameters of the ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$ and NiO interlayers. The NiO appears to order at temperatures larger than ${mathit{T}}_{mathit{N}}$ for bulk (520 K) due to coupling to the ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$ layers (${mathit{T}}_{mathit{C}}$=858 K). The dependence of this enhancement on the relative NiO composition is qualitatively consistent with the predictions of mean-field theory." @default.
- W1574803802 created "2016-06-24" @default.
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- W1574803802 date "1995-04-01" @default.
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- W1574803802 title "Long-range magnetic order in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>/NiO superlattices" @default.
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- W1574803802 doi "https://doi.org/10.1103/physrevb.51.8276" @default.
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