Suppression of the perpendicular anisotropy at the CoO Néel temperature in exchange-biased CoO/†Co/Pt‡ multilayers
Suppression of the perpendicular anisotropy at the CoO Néel temperature in exchange-biased CoO/†Co/Pt‡ multilayers
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DOI：
10.1063/1.3240402
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发表时间：
2009-10
影响因子：
4
通讯作者：
E. Shipton;K. Chan;T. Hauet;O. Hellwig;E. Fullerton
中科院分区：
文献类型：
--
作者：
E. Shipton;K. Chan;T. Hauet;O. Hellwig;E. Fullerton
我们对表现出垂直交换偏置的 CoO/[Co/Pt] 磁性多层进行了高场扭矩磁力测量。我们发现反铁磁体 CoO 层强烈改变了多层结构的单轴各向异性。 CoO 层产生的最强效应出现在尼尔温度附近，我们观察到一阶各向异性受到抑制，二阶各向异性有较小的增强。这导致各向异性随温度的非单调变化，并且对于选定的样品，随着温度的升高，各向异性从垂直到面内再回到垂直各向异性的转变。
We performed high field torque magnetometry measurements on CoO/[Co/Pt] magnetic multilayers that exhibit perpendicular exchange bias. We find that the antiferromagnet CoO layers strongly modify the uniaxial anisotropy of the multilayer structures. The strongest effects due to the CoO layers occur in the vicinity of the Neel temperature, where we observe a suppression of the first-order anisotropy and a smaller enhancement of the second-order anisotropy. This results in a nonmonotonic variation of the anisotropy with temperature and for selected samples a transition from perpendicular to in-plane and back to perpendicular anisotropy with increasing temperature.