Magnetic property and microstructure of SmCo magnetic recording films
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：WANG Lijin ZHANG En LI Ning LI Shuai
Key words：SmCo thin film; magnetic recording; magnetic exchange coupling; rare earths;
Abstract: Cr/SmCo/Cr thin films with Sm concentration of 37.7 at.% were deposited on glass substrates by magnetron sputtering. Meas-urement of magnetic properties showed that the SmCo film possessed good magnetic anisotropy, a high coercivity of 3019 kA/m and low magnetic exchange coupling. Microstructure analysis showed that crystallized SmCo_5 magnetic phase, non-magnetic SmCo_2 phase and Sm_2Co_7 phase co-existed ill the film. The non-magnetic SmCo2 phase might function as isolator of SmCo grains, leading to a decrease of magnetic exchange coupling. Moreover, a Cr_2O_3 oxide layer which could protect the SmCo layer from oxidation formed at the surface of the Cr cap layer.
WANG Lijin1，ZHANG En1，LI Ning1，LI Shuai1
(1.Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China)
Abstract:Cr/SmCo/Cr thin films with Sm concentration of 37.7 at.% were deposited on glass substrates by magnetron sputtering. Meas-urement of magnetic properties showed that the SmCo film possessed good magnetic anisotropy, a high coercivity of 3019 kA/m and low magnetic exchange coupling. Microstructure analysis showed that crystallized SmCo_5 magnetic phase, non-magnetic SmCo_2 phase and Sm_2Co_7 phase co-existed ill the film. The non-magnetic SmCo2 phase might function as isolator of SmCo grains, leading to a decrease of magnetic exchange coupling. Moreover, a Cr_2O_3 oxide layer which could protect the SmCo layer from oxidation formed at the surface of the Cr cap layer.
Key words:SmCo thin film; magnetic recording; magnetic exchange coupling; rare earths;
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