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

Acta Materialia

2016年2月8日(月)

Volume 107, 1 April 2016, Pages 49–58 ( 10.1016/j.actamat.2016.01.030 )
W.B. Cui, L. Ma, H. Sepehri-Amin, Y.K. Takahashi, K. Hono

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 singlelayer 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.

その他特記事項

This work was partly supported by the Elements Strategy Initiative Project under the auspice of MEXT and JST, CREST.


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