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These films underwent large tetragonal compressive strain due to the lattice mismatch between the substrates and films, resulting in tetragonalities of up to \u22120.04. Scanning transmission electron microscopy observation combined with fast Fourier transform analysis revealed that the lattice distortion monotonically relaxed with the increasing film thickness. Unlike the CFO(001) films on MgO(001) substrates, a magnetically enhanced layer exists at the interface between CFO and MAO. A large negative uniaxial MA energy of \u22125.9\u2009MJ/m3 was confirmed for the thinnest film of 12.9\u2009nm at 300\u2009K by magneto-torque measurements. The induced uniaxial anisotropy decreased with the increasing film thickness owing to misfit relaxation. The magneto-elastic (ME) constant, which was determined by a fitting line for films with different thicknesses and therefore different tetragonalities, was 0.15\u00b10.01\u2009GJ/m3. 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Large negative uniaxial magnetic anisotropy in highly distorted Co-ferrite thin films
http://hdl.handle.net/2241/00158701
181e8dca-80b9-408f-bc85-452f3618bc1c
名前 / ファイル | ライセンス | Actions | |
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item type | Journal Article(1) | |||||||||||
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公開日 | 2019-11-26 | |||||||||||
タイトル | ||||||||||||
タイトル | Large negative uniaxial magnetic anisotropy in highly distorted Co-ferrite thin films | |||||||||||
言語 | ||||||||||||
言語 | eng | |||||||||||
資源タイプ | ||||||||||||
タイプ | journal article | |||||||||||
著者 |
ソニア, シャーミン
× ソニア, シャーミン
WEKO
204454
× 喜多, 英治× 柳原, 英人× Tainosho, Takeshi× Inoue, Jun-ichiro× Takeguchi, Masaki |
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抄録 | ||||||||||||
内容記述 | The strain induced magnetic anisotropy (MA) of epitaxial Co-ferrite (CFO) thin films grown on MgAl2O4(001) (MAO) by reactive sputtering was studied. These films underwent large tetragonal compressive strain due to the lattice mismatch between the substrates and films, resulting in tetragonalities of up to −0.04. Scanning transmission electron microscopy observation combined with fast Fourier transform analysis revealed that the lattice distortion monotonically relaxed with the increasing film thickness. Unlike the CFO(001) films on MgO(001) substrates, a magnetically enhanced layer exists at the interface between CFO and MAO. A large negative uniaxial MA energy of −5.9 MJ/m3 was confirmed for the thinnest film of 12.9 nm at 300 K by magneto-torque measurements. The induced uniaxial anisotropy decreased with the increasing film thickness owing to misfit relaxation. The magneto-elastic (ME) constant, which was determined by a fitting line for films with different thicknesses and therefore different tetragonalities, was 0.15±0.01 GJ/m3. This result is consistent with the value of 0.14 GJ/m3 for the bulk and suggests that the framework of the phenomenological ME theory for CFO is valid for a wide range of tetragonalities, at least up to −0.04. Our results also indicate that the misfit engineering of CFO thin films has great potential in inducing enhanced uniaxial MA. | |||||||||||
書誌情報 |
Applied physics letters 巻 114, 号 9, p. 092408, 発行日 2019-03 |
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収録物識別子 | 0003-6951 | |||||||||||
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収録物識別子 | AA00543431 | |||||||||||
DOI | ||||||||||||
関連識別子 | ||||||||||||
関連識別子 | 10.1063/1.5064845 | |||||||||||
権利 | ||||||||||||
権利情報 | © 2019 Author(s). | |||||||||||
権利 | ||||||||||||
権利情報 | This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 114, 092408 (2019) and may be found at https://doi.org/10.1063/1.5064845. | |||||||||||
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値 | publisher | |||||||||||
出版者 | ||||||||||||
出版者 | American Institute of Physics |