Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite Co{sub x}Fe{sub 3−x}O{sub 4}(001) (x = 0.75, 1.0) thin films

doi:https://doi.org/10.1063/1.4824761

Title: Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite Co{sub x}Fe{sub 3−x}O{sub 4}(001) (x = 0.75, 1.0) thin films

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Abstract

Perpendicular magnetic anisotropy (PMA) of cobalt-ferrite Co{sub x}Fe{sub 3-x}O{sub 4} (x = 0.75 and 1.0) epitaxial thin films grown on MgO (001) by a reactive magnetron sputtering technique was investigated. The saturation magnetization was found to be 430 emu/cm{sup 3} for x = 0.75, which is comparable to that of bulk CoFe{sub 2}O{sub 4} (425 emu/cm{sup 3}). Torque measurements afforded PMA constants of K{sub u}{sup eff}=9.0 Merg/cm{sup 3} (K{sub u}=10.0 Merg/cm{sup 3}) and K{sub u}{sup eff}=9.7 Merg/cm{sup 3} for x = 0.75 and 1.0, respectively. The value of K{sub u}{sup eff} extrapolated using Miyajima's plot was as high as 14.7 Merg/cm{sup 3} for x = 1.0. The in-plane four-fold magnetic anisotropy was evaluated to be 1.6 Merg/cm{sup 3} for x = 0.75. X-ray diffraction measurement revealed our films to be pseudomorphically strained on MgO (001) with a Poisson ratio of 0.4, leading to a considerable in-plane tensile strain by which the extraordinarily large PMA could be accounted for.

Authors:

Niizeki, Tomohiko; Utsumi, Yuji; Aoyama, Ryohei; Yanagihara, Hideto; Inoue, Jun-ichiro; Kita, Eiji ^[1]; Yamasaki, Yuichi; Nakao, Hironori ^[2]; Koike, Kazuyuki ^[3]

Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)
Photon Factory and Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801 (Japan)
Division of Physics, Graduate School of Science, Hokkaido University, Kita 10, Nishi 8, Kita-ku, Sapporo (Japan)

Publication Date:: 2013-10-14

OSTI Identifier:: 22217909

Resource Type:: Journal Article

Journal Name:: Applied Physics Letters

Additional Journal Information:: Journal Volume: 103; Journal Issue: 16; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; ANISOTROPY; COBALT; COBALT OXIDES; DEPOSITION; EPITAXY; FERRITES; LAYERS; MAGNESIUM OXIDES; MAGNETIZATION; MAGNETRONS; POISSON RATIO; SATURATION; SPUTTERING; STRAINS; THIN FILMS; TORQUE; X-RAY DIFFRACTION

Citation Formats


                    Niizeki, Tomohiko, Utsumi, Yuji, Aoyama, Ryohei, Yanagihara, Hideto, Inoue, Jun-ichiro, Kita, Eiji, Yamasaki, Yuichi, Nakao, Hironori, and Koike, Kazuyuki. Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite Co{sub x}Fe{sub 3−x}O{sub 4}(001) (x = 0.75, 1.0) thin films.  United States: N. p., 2013. 
        Web.  doi:10.1063/1.4824761.

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                    Niizeki, Tomohiko, Utsumi, Yuji, Aoyama, Ryohei, Yanagihara, Hideto, Inoue, Jun-ichiro, Kita, Eiji, Yamasaki, Yuichi, Nakao, Hironori, & Koike, Kazuyuki. Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite Co{sub x}Fe{sub 3−x}O{sub 4}(001) (x = 0.75, 1.0) thin films.  United States.  https://doi.org/10.1063/1.4824761

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                    Niizeki, Tomohiko, Utsumi, Yuji, Aoyama, Ryohei, Yanagihara, Hideto, Inoue, Jun-ichiro, Kita, Eiji, Yamasaki, Yuichi, Nakao, Hironori, and Koike, Kazuyuki. Mon .  
        "Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite Co{sub x}Fe{sub 3−x}O{sub 4}(001) (x = 0.75, 1.0) thin films".  United States.  https://doi.org/10.1063/1.4824761.

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@article{osti_22217909,

  title        = {Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite Co{sub x}Fe{sub 3−x}O{sub 4}(001) (x = 0.75, 1.0) thin films},

  author       = {Niizeki, Tomohiko and Utsumi, Yuji and Aoyama, Ryohei and Yanagihara, Hideto and Inoue, Jun-ichiro and Kita, Eiji and Yamasaki, Yuichi and Nakao, Hironori and Koike, Kazuyuki},

  abstractNote = {Perpendicular magnetic anisotropy (PMA) of cobalt-ferrite Co{sub x}Fe{sub 3-x}O{sub 4} (x = 0.75 and 1.0) epitaxial thin films grown on MgO (001) by a reactive magnetron sputtering technique was investigated. The saturation magnetization was found to be 430 emu/cm{sup 3} for x = 0.75, which is comparable to that of bulk CoFe{sub 2}O{sub 4} (425 emu/cm{sup 3}). Torque measurements afforded PMA constants of K{sub u}{sup eff}=9.0 Merg/cm{sup 3} (K{sub u}=10.0 Merg/cm{sup 3}) and K{sub u}{sup eff}=9.7 Merg/cm{sup 3} for x = 0.75 and 1.0, respectively. The value of K{sub u}{sup eff} extrapolated using Miyajima's plot was as high as 14.7 Merg/cm{sup 3} for x = 1.0. The in-plane four-fold magnetic anisotropy was evaluated to be 1.6 Merg/cm{sup 3} for x = 0.75. X-ray diffraction measurement revealed our films to be pseudomorphically strained on MgO (001) with a Poisson ratio of 0.4, leading to a considerable in-plane tensile strain by which the extraordinarily large PMA could be accounted for.},

  doi          = {10.1063/1.4824761},

  url          = {https://www.osti.gov/biblio/22217909},
  journal      = {Applied Physics Letters},

  issn         = {0003-6951},

  number       = 16,

  volume       = 103,

  place        = {United States},

  year         = {2013},

  month        = {10}

}

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