本實驗乃研究於PtMn/NiFe之雙層膜系統中，錳成分變化以及退火處理對於交換偏移的影響。同時為了能精密的控制錳的成分變化，我們利用多層膜的方式來成長PtMn反鐵磁層，藉由不同厚度的Mn來改變Mn在PtMn裡頭的含量。
這裡我們選擇以Al2O3(1-102)為基板、以Mo作為緩衝層(200Å)、以及NiFe合金作為鐵磁層(70Å)，最後再以[Mn tMnÅ/Pt 2Å]多層膜為我們的反鐵磁層(tMn=2.0~3.5)。
經由MOKE量測可知當[Mn 2.5Å/Pt 2Å]時具備有最大的交換偏移效應(95Oe)，並且在經過退火處理之後更增加至360Oe左右，說明了退火處理對於交換偏移具有相當程度的影響。
經由X光繞射分析可知，[Mn 2.5Å/Pt 2Å]/NiFe的PtMn具備有最佳的FCT有序結構，同時經過退火處理後FCT結構有明顯的增加。這樣的結果似乎說明了FCT結構與交換偏移場有相當密切的關係。

We studied effects of Mn concentration and annealing treatment on the exchange biasing of NiFe/PtMn. By multilyer growth of [Mn/Pt], the Mn concentration can be exactly controlled with various Mn thickness. [Mn tMnÅ/Pt 2Å]30 (tMn=2.0~3.5Å) multilayers were deposited under NiFe(70Å) ferromagnetic layer grown on Mo (200Å) buffer layer on Al2O3(1-102). Among the various Mn thickness, the exchange biasing filed(Hex) of as-deposited [Mn 2.5Å/Pt 2Å]30/NiFe was largest(~95 Oe) and could be increased to ~360 Oe after annealing treatment at 250℃. The enhancement of Hex in [Mn 2.5Å/Pt 2Å]30/NiFe is much stronger than those of [Mn 2.0,2.25,2.75,3.0,3.2Å/Pt 2Å]30/NiFe samples.(Fig.1) Further, X-ray diffraction also indicates that the amounts of the ordering structure (face-center-tetragonal structure, FCT) in [Mn 2.5Å/Pt 2Å] mutilayer are biggest before and after annealing treatment. A clear correlation between the FCT structure and Hex in [Mn/Pt]/NiFe is found by controlling Mn concentration and the annealing study. Hex of [Mn tMn/Pt 2Å]/NiFe is determined by the amount of FCT structures and the enhancement of Hex after annealing treatment is likely due to the increase of FCT structures.

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