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

Jeong Hong Jo; Eun Jeong Shin; Hyung jun Kim; Sang Ho Lim

doi:10.1016/j.jmmm.2016.08.045

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

Jeong Hong Jo, Eun Jeong Shin, Hyung jun Kim, Sang Ho Lim

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

3 Citations (Scopus)

Abstract

The magnetic properties of epitaxial Fe/MgO structures on Si(100) substrates are investigated over an Fe thickness range of 2–20 nm. Superparamagnetic behavior is observed at an Fe thickness of 2 nm, indicating that no continuous Fe thin film is formed. At Fe thicknesses of 5 nm 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 3.87×10⁵–4.04×10⁵ erg/cm³, weaker than that of bulk Fe (4.8×10⁵ erg/cm³).

Original language	English
Pages (from-to)	440-447
Number of pages	8
Journal	Journal of Magnetism and Magnetic Materials
Volume	421
DOIs	https://doi.org/10.1016/j.jmmm.2016.08.045
Publication status	Published - 2017 Jan 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (Nos. 2011-0028163 and 2015-004870 ).

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

Epitaxial thin films
Fe/MgO/Si(100) system
Magnetic anisotropy
Si spintronics

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2016.08.045

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title = "Magnetic properties of epitaxial Fe/MgO structures on Si(100)",

abstract = "The magnetic properties of epitaxial Fe/MgO structures on Si(100) substrates are investigated over an Fe thickness range of 2–20 nm. Superparamagnetic behavior is observed at an Fe thickness of 2 nm, indicating that no continuous Fe thin film is formed. At Fe thicknesses of 5 nm 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 3.87×105–4.04×105 erg/cm3, weaker than that of bulk Fe (4.8×105 erg/cm3).",

keywords = "Epitaxial thin films, Fe/MgO/Si(100) system, Magnetic anisotropy, Si spintronics",

author = "Jo, {Jeong Hong} and Shin, {Eun Jeong} and Kim, {Hyung jun} and Lim, {Sang Ho}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (Nos. 2011-0028163 and 2015-004870 ). Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2017",

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doi = "10.1016/j.jmmm.2016.08.045",

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AU - Jo, Jeong Hong

AU - Shin, Eun Jeong

AU - Kim, Hyung jun

AU - Lim, Sang Ho

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (Nos. 2011-0028163 and 2015-004870 ). Publisher Copyright: © 2016 Elsevier B.V.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The magnetic properties of epitaxial Fe/MgO structures on Si(100) substrates are investigated over an Fe thickness range of 2–20 nm. Superparamagnetic behavior is observed at an Fe thickness of 2 nm, indicating that no continuous Fe thin film is formed. At Fe thicknesses of 5 nm 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 3.87×105–4.04×105 erg/cm3, weaker than that of bulk Fe (4.8×105 erg/cm3).

AB - The magnetic properties of epitaxial Fe/MgO structures on Si(100) substrates are investigated over an Fe thickness range of 2–20 nm. Superparamagnetic behavior is observed at an Fe thickness of 2 nm, indicating that no continuous Fe thin film is formed. At Fe thicknesses of 5 nm 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 3.87×105–4.04×105 erg/cm3, weaker than that of bulk Fe (4.8×105 erg/cm3).

KW - Epitaxial thin films

KW - Fe/MgO/Si(100) system

KW - Magnetic anisotropy

KW - Si spintronics

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JF - Journal of Magnetism and Magnetic Materials

ER -

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

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Keywords

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