## 抄録

Perpendicular magnetic anisotropy (PMA) of cobalt-ferrite Co _{x}Fe_{3-x}O_{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^{3} for x = 0.75, which is comparable to that of bulk CoFe _{2}O_{4} (425 emu/cm^{3}). Torque measurements afforded PMA constants of K_{eff}^{u} = 9.0 Merg/cm 3 (Ku = 10.0 Merg / cm^{3}) and K_{eff}^{u} = 9.7 Merg / cm^{3} for x = 0.75 and 1.0, respectively. The value of K_{eff}^{u} extrapolated using Miyajima's plot was as high as 14.7 Merg/cm^{3} for x = 1.0. The in-plane four-fold magnetic anisotropy was evaluated to be 1.6 Merg/cm^{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.

本文言語 | English |
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論文番号 | 162407 |

ジャーナル | Applied Physics Letters |

巻 | 103 |

号 | 16 |

DOI | |

出版ステータス | Published - 2013 10月 14 |

## ASJC Scopus subject areas

- 物理学および天文学（その他）

## フィンガープリント

「Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite Co_{x}Fe

_{3-x}O

_{4}(001) (x = 0.75, 1.0) thin films」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。