The finite size effect on the transport and magnetic properties of epitaxial Fe3O4 thin films

Alraddadi, Shoroog; Hines, William; Gu, Genda; Sinkovic, Boris

doi:10.1166/mex.2018.1452

Title: The finite size effect on the transport and magnetic properties of epitaxial Fe₃O₄ thin films

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Abstract

Here, magnetite (Fe₃O₄) has great potential for use in the new field of spintronics due to its interesting physical properties, e.g., half-metallic ferromagnetic nature and metal–insulator transition (Verwey transition). Therefore, a basic understanding of these properties is essential for applications in spintronics devices, especially as the film thickness is reduced. In this work, the transport and magnetic properties of stoichiometric ultrathin epitaxial Fe₃O₄ films have been investigated. The Fe₃O₄ films were grown on MgO (001) substrates using molecular beam epitaxy under optimal growth conditions. Low energy electron diffraction and X-ray photoemission spectroscopy confirmed that the films are single phase Fe₃O₄. The Verwey transition has been investigated using both transport and magnetization measurements. The magnetization measurements show a sharp Verwey transition in all of these films, which indicates that the films have properties comparable to the bulk. Furthermore, the magnetization measurements at room temperature show that the ultrathin films with thickness t < 20 nm are ferromagnetic with magnetization values greater than those for bulk magnetite. Such enhanced magnetization in ultrathin Fe₃O₄ films is very promising for spin injection and other applications.

Authors:

Alraddadi, Shoroog ^[1]; Hines, William ^[2];

^[3]; Sinkovic, Boris ^[2]

Umm Al-Qura Univ., Mecca (Saudi Arabia)
Univ. of Connecticut, Storrs, CT (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: 2018-10-01

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1491696

Report Number(s):: BNL-210888-2019-JAAM
Journal ID: ISSN 2158-5849

Grant/Contract Number:: SC0012704

Resource Type:: Accepted Manuscript

Journal Name:: Materials Express

Additional Journal Information:: Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 2158-5849

Publisher:: American Scientific Publishers

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; epitaxial growth; Fe3O4; magnetization; thin film; verwey transition

Citation Formats


                    Alraddadi, Shoroog, Hines, William, Gu, Genda, and Sinkovic, Boris. The finite size effect on the transport and magnetic properties of epitaxial Fe3O4 thin films.  United States: N. p., 2018. 
Web.  doi:10.1166/mex.2018.1452.

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                    Alraddadi, Shoroog, Hines, William, Gu, Genda, & Sinkovic, Boris. The finite size effect on the transport and magnetic properties of epitaxial Fe3O4 thin films.  United States.  https://doi.org/10.1166/mex.2018.1452

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                    Alraddadi, Shoroog, Hines, William, Gu, Genda, and Sinkovic, Boris. Mon .  
"The finite size effect on the transport and magnetic properties of epitaxial Fe3O4 thin films".  United States.  https://doi.org/10.1166/mex.2018.1452.  https://www.osti.gov/servlets/purl/1491696.

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@article{osti_1491696,

  title        = {The finite size effect on the transport and magnetic properties of epitaxial Fe3O4 thin films},

  author       = {Alraddadi, Shoroog and Hines, William and Gu, Genda and Sinkovic, Boris},

  abstractNote = {Here, magnetite (Fe3O4) has great potential for use in the new field of spintronics due to its interesting physical properties, e.g., half-metallic ferromagnetic nature and metal–insulator transition (Verwey transition). Therefore, a basic understanding of these properties is essential for applications in spintronics devices, especially as the film thickness is reduced. In this work, the transport and magnetic properties of stoichiometric ultrathin epitaxial Fe3O4 films have been investigated. The Fe3O4 films were grown on MgO (001) substrates using molecular beam epitaxy under optimal growth conditions. Low energy electron diffraction and X-ray photoemission spectroscopy confirmed that the films are single phase Fe3O4. The Verwey transition has been investigated using both transport and magnetization measurements. The magnetization measurements show a sharp Verwey transition in all of these films, which indicates that the films have properties comparable to the bulk. Furthermore, the magnetization measurements at room temperature show that the ultrathin films with thickness t < 20 nm are ferromagnetic with magnetization values greater than those for bulk magnetite. Such enhanced magnetization in ultrathin Fe3O4 films is very promising for spin injection and other applications.},

  doi          = {10.1166/mex.2018.1452},

  journal      = {Materials Express},

  number       = 5,

  volume       = 8,

  place        = {United States},

  year         = {2018},

  month        = {10}

}

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Title: The finite size effect on the transport and magnetic properties of epitaxial Fe3O4 thin films

Abstract

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Title: The finite size effect on the transport and magnetic properties of epitaxial Fe₃O₄ thin films