Perpendicular exchange bias behaviors of CoPt/IrMn and CoPt/FeMn bilayers: A comparative study
Perpendicular exchange bias behaviors of CoPt/IrMn and CoPt/FeMn bilayers: A comparative study
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DOI：
10.1063/1.4919116
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发表时间：
2015-04
影响因子：
3.2
通讯作者：
Cheng‐Che Tsai;J. Hsu;King-Fu Lin
中科院分区：
文献类型：
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作者：
Cheng‐Che Tsai;J. Hsu;King-Fu Lin
在本研究中，FeMn作为反铁磁（AFM）层被引入到单层Co49Pt51合金薄膜中，并与Co49Pt51/IrMn双层体系的交换偏置（EB）效应进行了比较，探讨了CoPt/IrMn双层中最近观察到的自发垂直交换偏置（PEB）的机制。在相同条件下，室温无诱导场溅射制备了CoPt/IrMn和CoPt/FeMn双层膜。虽然在生长的CoPt/FeMn双分子层中观察到PEB，但发现环的形状和PEB行为与CoPt/IrMn双分子层表现出不同的特征。CoPt (5 nm)/FeMn （10 nm）双分子层具有类似于双位移环的剪切环，并且比CoPt (5 nm)/IrMn （10 nm）体系具有更低的方形比（SQR = 0.52）和交换偏置场（He = 180 Oe），后者具有矩形环形状，高SQR为0.97，大He为290 Oe。这两个系统表现出完全不同的……
In this study, FeMn was introduced as an antiferromagnetic (AFM) layer to couple with a single-layered Co49Pt51 alloy thin film, and it was compared with a Co49Pt51/IrMn bilayer system in exchange bias (EB) effect, to explore the mechanism of spontaneous perpendicular exchange bias (PEB), which has been recently observed in CoPt/IrMn bilayers. Bilayers of CoPt/IrMn and CoPt/FeMn were prepared under the same conditions by sputtering at room temperature without any inducing field. Although PEB was observed in as-grown CoPt/FeMn bilayers, the loop shape and PEB behavior were found to exhibit different characteristics from those of CoPt/IrMn bilayers. The CoPt (5 nm)/FeMn (10 nm) bilayer has a sheared loop that is similar to a double-shifted loop and a much lower squareness ratio (SQR = 0.52) and exchange bias field (He = 180 Oe) than the CoPt (5 nm)/IrMn (10 nm) system, which has a rectangular loop shape and a high SQR of 0.97 and large He of 290 Oe. The two systems present entirely different dependences of ...