Magnetic property and microstructure of SmCo magnetic recording films

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• 作者：Ning LI ; Shuai LI ; En ZHANG ; Lijin WANG
• 关键词：SmCo thin film ; magnetic recording ; magnetic exchange coupling ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2009
• 出版时间：October 2009
• 年：2009
• 卷：27
• 期：5
• 页码：839-842
• 全文大小：573 K

文摘

Cr/SmCo/Cr thin films with Sm concentration of 37.7 at. % were deposited on glass substrates by magnetron sputtering. Measurement 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 SmCo₅ magnetic phase, non-magnetic SmCo₂ phase and Sm₂Co₇ phase co-existed in the film. The non-magnetic SmCo₂ phase might function as isolator of SmCo grains, leading to a decrease of magnetic exchange coupling. Moreover, a Cr₂O₃ oxide layer which could protect the SmCo layer from oxidation formed at the surface of the Cr cap layer.