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Magnetic Structure in Fe/Sm-Co Exchange Spring Bilayers with Intermixed Interfaces

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arxiv 1012.5086 v1 pith:Q6ABE3TF submitted 2010-12-22 cond-mat.mtrl-sci cond-mat.mes-hall

Yaohua Liu , S. G. E. te Velthuis , J. S. Jiang , Y. Choi , S. D. Bader , A. A. Parizzi , H. Ambaye , V. Lauter This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.mes-hall
keywords sm-comagneticexchangeintermixedinterfacemagnetizationpropertiesanisotropy
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The depth profile of the intrinsic magnetic properties in an Fe/Sm-Co bilayer fabricated under nearly optimal spring-magnet conditions was determined by complementary studies of polarized neutron reflectometry and micromagnetic simulations. We found that at the Fe/Sm-Co interface the magnetic properties change gradually at the length scale of 8 nm. In this intermixed interfacial region, the saturation magnetization and magnetic anisotropy are lower and the exchange stiffness is higher than values estimated from the model based on a mixture of Fe and Sm-Co phases. Therefore, the intermixed interface yields superior exchange coupling between the Fe and Sm-Co layers, but at the cost of average magnetization.

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