Exchange coupling and spin-flip transition of CoFe2O4/α-Fe2O3 bilayered films

Tatsuo Fujii; Takuya Yano; Makoto Nakanishi; Jun Takada

doi:10.1557/proc-674-t1.10

Exchange coupling and spin-flip transition of CoFe₂O₄/α-Fe₂O₃ bilayered films

Tatsuo Fujii, Takuya Yano, Makoto Nakanishi, Jun Takada

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

CoFe₂O₄/α-Fe₂O₃ (ferrimagnetic/antiferromagnetic) bilayered films were prepared on α-Al₂O₃(102) single-crystalline substrates by helicon plasma sputtering. A well-crystallized epitaxial α-Fe₂O₃(102) layer was formed on the substrate, while CoFe₂O₄ grown on α-Fe₂O₃ (102) was a polycrystalline layer with a (100)-preferred orientation. The α-Fe₂O₃(102) films without CoFe₂O₄ layers clearly showed a spin-flip transition at about 400 K. The spins aligned perpendicular to the film plane at room temperature changed their direction within the film plane above 400 K. However the α-Fe₂O₃ base layers of CoFe₂O₄/α-Fe₂O₃ bilayered films did not show any spin-flip transition. The CoFe₂O₄ layer on α-Fe₂O₃ had a large in-plane magnetic anisotropy, while the spin axis of the α-Fe₂O₃ (102) base layer was directed perpendicular to the film plane. The magnetization of ferrimagnetic CoFe₂O₄ layers was coupled perpendicularly to the spin axis of antiferromagnetic α-Fe₂O₃ layers due to the exchange coupling at the interface between CoFe₂O₄ and α-Fe₂O₃.

Original language	English
Pages (from-to)	T1.10.1-T1.10.6
Journal	Materials Research Society Symposium - Proceedings
Volume	674
DOIs	https://doi.org/10.1557/proc-674-t1.10
Publication status	Published - 2001
Event	Applications of Ferromagnetic and Optical Materials, Storage and Magnotoelectronics - San Francisco, CA, United States Duration: Apr 16 2001 → Apr 20 2001

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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@article{0578a1a62a554e7d9ae9ca3ec4989468,

title = "Exchange coupling and spin-flip transition of CoFe2O4/α-Fe2O3 bilayered films",

abstract = "CoFe2O4/α-Fe2O3 (ferrimagnetic/antiferromagnetic) bilayered films were prepared on α-Al2O3(102) single-crystalline substrates by helicon plasma sputtering. A well-crystallized epitaxial α-Fe2O3(102) layer was formed on the substrate, while CoFe2O4 grown on α-Fe2O3 (102) was a polycrystalline layer with a (100)-preferred orientation. The α-Fe2O3(102) films without CoFe2O4 layers clearly showed a spin-flip transition at about 400 K. The spins aligned perpendicular to the film plane at room temperature changed their direction within the film plane above 400 K. However the α-Fe2O3 base layers of CoFe2O4/α-Fe2O3 bilayered films did not show any spin-flip transition. The CoFe2O4 layer on α-Fe2O3 had a large in-plane magnetic anisotropy, while the spin axis of the α-Fe2O3 (102) base layer was directed perpendicular to the film plane. The magnetization of ferrimagnetic CoFe2O4 layers was coupled perpendicularly to the spin axis of antiferromagnetic α-Fe2O3 layers due to the exchange coupling at the interface between CoFe2O4 and α-Fe2O3.",

author = "Tatsuo Fujii and Takuya Yano and Makoto Nakanishi and Jun Takada",

note = "Funding Information: This work was financially supported by grant-in-aid from Ministry of Education, Culture, Sports, Science and Technology, Japan; Applications of Ferromagnetic and Optical Materials, Storage and Magnotoelectronics ; Conference date: 16-04-2001 Through 20-04-2001",

year = "2001",

doi = "10.1557/proc-674-t1.10",

language = "English",

volume = "674",

pages = "T1.10.1--T1.10.6",

journal = "Materials Research Society Symposium - Proceedings",

issn = "0272-9172",

publisher = "Materials Research Society",

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TY - JOUR

T1 - Exchange coupling and spin-flip transition of CoFe2O4/α-Fe2O3 bilayered films

AU - Fujii, Tatsuo

AU - Yano, Takuya

AU - Nakanishi, Makoto

AU - Takada, Jun

N1 - Funding Information: This work was financially supported by grant-in-aid from Ministry of Education, Culture, Sports, Science and Technology, Japan

PY - 2001

Y1 - 2001

N2 - CoFe2O4/α-Fe2O3 (ferrimagnetic/antiferromagnetic) bilayered films were prepared on α-Al2O3(102) single-crystalline substrates by helicon plasma sputtering. A well-crystallized epitaxial α-Fe2O3(102) layer was formed on the substrate, while CoFe2O4 grown on α-Fe2O3 (102) was a polycrystalline layer with a (100)-preferred orientation. The α-Fe2O3(102) films without CoFe2O4 layers clearly showed a spin-flip transition at about 400 K. The spins aligned perpendicular to the film plane at room temperature changed their direction within the film plane above 400 K. However the α-Fe2O3 base layers of CoFe2O4/α-Fe2O3 bilayered films did not show any spin-flip transition. The CoFe2O4 layer on α-Fe2O3 had a large in-plane magnetic anisotropy, while the spin axis of the α-Fe2O3 (102) base layer was directed perpendicular to the film plane. The magnetization of ferrimagnetic CoFe2O4 layers was coupled perpendicularly to the spin axis of antiferromagnetic α-Fe2O3 layers due to the exchange coupling at the interface between CoFe2O4 and α-Fe2O3.

AB - CoFe2O4/α-Fe2O3 (ferrimagnetic/antiferromagnetic) bilayered films were prepared on α-Al2O3(102) single-crystalline substrates by helicon plasma sputtering. A well-crystallized epitaxial α-Fe2O3(102) layer was formed on the substrate, while CoFe2O4 grown on α-Fe2O3 (102) was a polycrystalline layer with a (100)-preferred orientation. The α-Fe2O3(102) films without CoFe2O4 layers clearly showed a spin-flip transition at about 400 K. The spins aligned perpendicular to the film plane at room temperature changed their direction within the film plane above 400 K. However the α-Fe2O3 base layers of CoFe2O4/α-Fe2O3 bilayered films did not show any spin-flip transition. The CoFe2O4 layer on α-Fe2O3 had a large in-plane magnetic anisotropy, while the spin axis of the α-Fe2O3 (102) base layer was directed perpendicular to the film plane. The magnetization of ferrimagnetic CoFe2O4 layers was coupled perpendicularly to the spin axis of antiferromagnetic α-Fe2O3 layers due to the exchange coupling at the interface between CoFe2O4 and α-Fe2O3.

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DO - 10.1557/proc-674-t1.10

M3 - Conference article

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VL - 674

SP - T1.10.1-T1.10.6

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

SN - 0272-9172

T2 - Applications of Ferromagnetic and Optical Materials, Storage and Magnotoelectronics

Y2 - 16 April 2001 through 20 April 2001

ER -

Exchange coupling and spin-flip transition of CoFe₂O₄/α-Fe₂O₃ bilayered films

Abstract

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