Exchange bias in (1 1 0)-orientated Bib>0.9b>Lab>0.1b>FeOb>3b>/Lab>0.5b>Cab>0.5b>MnOb>3b> films

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• 作者：J.L. Zhao ; R.L. Gao ; W.W. Gao ; B.G. Shen ; J.R. Sun ; ^{jrsun@aphy.iphy.ac.cn}
• 关键词：Exchange bias ; BLFO/LCMO films ; Magnetic phases
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：15 July, 2012
• 卷：407
• 期：14
• 页码：2773-2777
• 文件大小：465 K

摘要

We performed a systematic study on the exchange bias in (1 1 0)-orientated Bib>0.9b>Lab>0.1b>FeOb>3b>/Lab>0.5b>Cab>0.5b>MnOb>3b> (BLFO/LCMO) heterostructure with a fixed BLFO film thickness of 600 nm and different LCMO layers ranging from t=0 to 30 nm. The LCMO is found to be weakly ferromagnetic, with the Curie temperature descending from 鈭?25 K to 0 as the layer thickness decreases from 30 nm to 3 nm. The main magnetic contributions come from the BLFO film, and the areal magnetization ratio is 1:0.07 for t=5 nm and 1:0.82 for t=30 nm for BLFO to LCMO at the temperature of 5 K. Further experiments show the presence of significant exchange bias, and it is, at the temperature of 10 K, 鈭?0 Oe for t=0 and 鈭?60 Oe for t=30 nm. The exchange bias reduces dramatically upon warming and disappears above the blocking temperature of the spin-glasslike behavior observed in the samples. The possible origin for exchange bias is discussed.