The influence of grain morphology and easy axis orientation on the coercivity of Sm(Co0.9Cu0.1)5 thin films

W. B. Cui; L. Ma; H. Sepehri-Amin; Y. K. Takahashi; K. Hono

doi:10.1016/j.actamat.2016.01.030

The influence of grain morphology and easy axis orientation on the coercivity of Sm(Co_0.9Cu_0.1)₅ thin films

W. B. Cui, L. Ma, H. Sepehri-Amin, Y. K. Takahashi, K. Hono

National Institute for Materials Science Tsukuba

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

Sm(Co_0.9Cu_0.1)₅ single-layer thin films and Sm(Co_0.9Cu_0.1)₅/Fe₂Co exchange coupled bilayer films with c-axis in the plane (IP) and out of the plane (OOP) orientations were prepared on MgO and Al₂O₃ single crystalline substrates by magnetron sputtering. Clear relationship between the grain morphology and coercivity was observed for the Sm(Co_0.9Cu_0.1)₅ single-layer films. We found the thermal stability of coercivity is largely influenced by the c-axis orientation because the c-axis IP geometry lowers magnetostatic effect that plays an increasing role at elevated temperature. In Sm(Co_0.9Cu_0.1)₅/Fe₂Co bilayer films with the two c-axis geometries, the coercivity show larger dependence on the thickness of the Fe₂Co layer for the c-axis IP geometry due to the energetically unfavorable magnetostatic coupling between hard/soft-magnetic layers, which is supported by micromagnetic simulations.

Original language	English
Pages (from-to)	49-58
Number of pages	10
Journal	Acta Materialia
Volume	107
DOIs	https://doi.org/10.1016/j.actamat.2016.01.030
Publication status	Published - 2016 Apr 1

Keywords

Coercivity
Micromagnetic
Permanet magnet
SmCo
Thin film

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10.1016/j.actamat.2016.01.030

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@article{4a79db64feb14f9ba1e7ae1c9a305c18,

title = "The influence of grain morphology and easy axis orientation on the coercivity of Sm(Co0.9Cu0.1)5 thin films",

abstract = "Sm(Co0.9Cu0.1)5 single-layer thin films and Sm(Co0.9Cu0.1)5/Fe2Co exchange coupled bilayer films with c-axis in the plane (IP) and out of the plane (OOP) orientations were prepared on MgO and Al2O3 single crystalline substrates by magnetron sputtering. Clear relationship between the grain morphology and coercivity was observed for the Sm(Co0.9Cu0.1)5 single-layer films. We found the thermal stability of coercivity is largely influenced by the c-axis orientation because the c-axis IP geometry lowers magnetostatic effect that plays an increasing role at elevated temperature. In Sm(Co0.9Cu0.1)5/Fe2Co bilayer films with the two c-axis geometries, the coercivity show larger dependence on the thickness of the Fe2Co layer for the c-axis IP geometry due to the energetically unfavorable magnetostatic coupling between hard/soft-magnetic layers, which is supported by micromagnetic simulations.",

keywords = "Coercivity, Micromagnetic, Permanet magnet, SmCo, Thin film",

author = "Cui, {W. B.} and L. Ma and H. Sepehri-Amin and Takahashi, {Y. K.} and K. Hono",

note = "Funding Information: This work was partly supported by the Elements Strategy Initiative Project under the auspice of MEXT and JST, CREST . Publisher Copyright: {\textcopyright} 2016 Acta Materialia Inc.",

year = "2016",

month = apr,

day = "1",

doi = "10.1016/j.actamat.2016.01.030",

language = "English",

volume = "107",

pages = "49--58",

journal = "Acta Materialia",

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T1 - The influence of grain morphology and easy axis orientation on the coercivity of Sm(Co0.9Cu0.1)5 thin films

AU - Cui, W. B.

AU - Ma, L.

AU - Sepehri-Amin, H.

AU - Takahashi, Y. K.

AU - Hono, K.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - Sm(Co0.9Cu0.1)5 single-layer thin films and Sm(Co0.9Cu0.1)5/Fe2Co exchange coupled bilayer films with c-axis in the plane (IP) and out of the plane (OOP) orientations were prepared on MgO and Al2O3 single crystalline substrates by magnetron sputtering. Clear relationship between the grain morphology and coercivity was observed for the Sm(Co0.9Cu0.1)5 single-layer films. We found the thermal stability of coercivity is largely influenced by the c-axis orientation because the c-axis IP geometry lowers magnetostatic effect that plays an increasing role at elevated temperature. In Sm(Co0.9Cu0.1)5/Fe2Co bilayer films with the two c-axis geometries, the coercivity show larger dependence on the thickness of the Fe2Co layer for the c-axis IP geometry due to the energetically unfavorable magnetostatic coupling between hard/soft-magnetic layers, which is supported by micromagnetic simulations.

AB - Sm(Co0.9Cu0.1)5 single-layer thin films and Sm(Co0.9Cu0.1)5/Fe2Co exchange coupled bilayer films with c-axis in the plane (IP) and out of the plane (OOP) orientations were prepared on MgO and Al2O3 single crystalline substrates by magnetron sputtering. Clear relationship between the grain morphology and coercivity was observed for the Sm(Co0.9Cu0.1)5 single-layer films. We found the thermal stability of coercivity is largely influenced by the c-axis orientation because the c-axis IP geometry lowers magnetostatic effect that plays an increasing role at elevated temperature. In Sm(Co0.9Cu0.1)5/Fe2Co bilayer films with the two c-axis geometries, the coercivity show larger dependence on the thickness of the Fe2Co layer for the c-axis IP geometry due to the energetically unfavorable magnetostatic coupling between hard/soft-magnetic layers, which is supported by micromagnetic simulations.

KW - Coercivity

KW - Micromagnetic

KW - Permanet magnet

KW - SmCo

KW - Thin film

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JO - Acta Materialia

JF - Acta Materialia

ER -

The influence of grain morphology and easy axis orientation on the coercivity of Sm(Co_0.9Cu_0.1)₅ thin films

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