Study on the occurrence of spontaneously established perpendicular exchange bias in Co49Pt51/IrMn bilayers
Study on the occurrence of spontaneously established perpendicular exchange bias in Co49Pt51/IrMn bilayers
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DOI：
10.1063/1.4868915
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发表时间：
2014-03
影响因子：
3.2
通讯作者：
Chien-Ying Tsai;J. Hsu;P. Saravanan;King-Fu Lin
中科院分区：
文献类型：
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作者：
Chien-Ying Tsai;J. Hsu;P. Saravanan;King-Fu Lin
在本研究中，以单层Co49Pt51合金薄膜作为铁磁层，在室温下证明了Co49Pt51/IrMn双分子层的垂直交换偏置（PEB）效应。在这个系统中观察到几个不寻常的特征，即：(i) PEB是自发建立的，没有任何外部磁场处理，（ii）获得了单位移环路，而不是双位移环路，（iii）自发的PEB效应伴随着垂直矫矫力的降低，hsalt从1024到632 Oe。x射线衍射结果显示IrMn（111）织构的形成。训练效果研究表明，该系统的PEB效果稳定，在15次重复扫描中，PEB值的变化小于5%。发现在外加磁场下生长或退火的CoPt/IrMn薄膜的PEB效应显著降低（Hind）。PEB效应的厚度与调频和反铁磁的关系。
In this study, perpendicular exchange bias (PEB) effect in the as-grown Co49Pt51/IrMn bilayers was demonstrated at room temperature using single-layered Co49Pt51 alloy thin film as ferromagnetic (FM) layer. Several unusual features were observed in this system, viz.,: (i) the PEB was spontaneously established without any external magnetic field treatments, (ii) single-shifted loops were obtained rather than double-shifted ones, and (iii) the spontaneous PEB effect was accompanied by a reduction in perpendicular coercivity, Hc⊥ from 1024 to 632 Oe. The results of x–ray diffraction revealed the formation of IrMn (111) texture. Training effect studies indicate that the PEB effect is stable in this system with less than 5% variation in PEB value within 15 repetitive scans. Significant reduction in the PEB effect was found for the CoPt/IrMn films either grown or subjected to post-annealing under external magnetic field (Hind). The thickness dependence of PEB effect with respect to the FM and antiferromagnetic ...