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Magnetic properties of epitaxial Fe/MgO structures on Si(100)

The magnetic properties of epitaxial Fe/MgO structures on Si(100) substrates are investigated over an Fe thickness range of 2–20nm. Superparamagnetic behavior is observed at an Fe thickness of 2nm, indicating that no continuous Fe thin film is formed. At Fe thicknesses of 5nm and higher, a continuou...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2017-01, Vol.421, p.440-447
Main Authors: Jo, Jeong Hong, Shin, Eun Jeong, Kim, Hyung-jun, Lim, Sang Ho
Format: Article
Language:English
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Summary:The magnetic properties of epitaxial Fe/MgO structures on Si(100) substrates are investigated over an Fe thickness range of 2–20nm. Superparamagnetic behavior is observed at an Fe thickness of 2nm, indicating that no continuous Fe thin film is formed. At Fe thicknesses of 5nm and higher, a continuous two-dimensional layered structure is formed, which has a dominant epitaxial relationship of Fe[010](100)//MgO[011¯] (100)//Si[011¯](100) and a minor portion of Fe[010](100)//MgO[010](100)//Si[011¯](100). This structural feature is echoed by a four-fold magnetic anisotropy in the film plane, and this tendency increases with increasing Fe thickness. The strength of the first-order cubic magnetocrystalline anisotropy, which can only be extracted from the structures, is in the range of 3.87×105–4.04×105erg/cm3, weaker than that of bulk Fe (4.8×105erg/cm3). •An MBE growth of Fe/MgO on a Si(100) substrate.•Observation of a clear four-fold magnetic anisotropy in the film plane.•Determination of the first-order cubic magnetocrystalline anisotropy.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2016.08.045