本論文中，我們利用磁光科爾效應儀、X光繞射以及軟X光的磁圓偏振二向性來研究經由中間層釕的隔絕，坡莫合金的層間交換耦合作用。我們發現交換偶合作用以及磁阻會隨著中間層釕的厚度變化而有震盪的情形。耦合強度的第一個最大值出現在釕的厚度為0.7奈米時，其震盪週期為1奈米。然而在此厚度時我們並沒有發現到巨磁阻的存在。磁阻較小的原因可能為坡莫合金間較為粗糙的介面使得其耦合為90度耦合而非一般的反平行耦合。從磁圓偏振二向性的結果，我們發現鐵的軌道磁矩在坡莫合金為反鐵磁耦合時增益了4倍左右，且有著類似的震盪情形。從掠角X光繞射實驗我們並沒有發現坡莫合金與釕有很明顯的應變。在這系統中，應變並不是軌道磁矩增益的主要原因。此外，此一增益現象並沒有在坡莫合金/釕雙層膜的系統中發現，顯示除了在單一介面中鐵的3d以及釕的4d元素間的混層效應外尚有其他作用存在。猜測在兩介面間的干擾亦會有所影響。

The interlayer exchange coupling between two permalloy layers with Ru spacer layer was studied by longitudinal magneto-optical Kerr effect, X-ray diffraction and X-ray magnetic circular dichroism. Oscillations of MR and exchange coupling vs Ru spacer thickness have been observed. The first maximum of the coupling strength appears at 0.7 nm of Ru with oscillatory period of 1 nm. However, a large GMR effect does not observed at this Ru thickness. The missing GMR effect of this system might be due to the strong biquadratic coupling of permalloy layers. It is suggested this biqudratic coupling might be due to the rough interface morphology between permalloy layer through the Ru space layer.
With the MCD experiment result, a 400% enhancement of orbital moment of Fe in the permalloy /Ru/ permalloy trilayer system was found at the thickness of Ru spacer layers of antiferromagnetic coupling between permalloy layers. The MCD asymmetry ratios deduced from the Fe, Ni L2,3-edge show a similar oscillation correlated to the interlayer exchange coupling. Grazing incidence X-ray diffraction was used to study the structure of the epitaxial films. Both the permalloy and Ru layers have no significant strains appeared to correlate with this orbital moment enhancement. Strain might not be the major issue to cause the enhancement of orbital moment. Besides, this large enhancement was not found for Py/Ru bilayer system which implies this effect might not depend only on the hybridization of the Fe-3d and Ru-4d electrons at one interface only. It is suggested this effect might be due to the interference between two interfaces.

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