Exchange bias in NiFe∕FeMn∕NiFe trilayers
Exchange bias in NiFe∕FeMn∕NiFe trilayers
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DOI：
10.1063/1.1815048
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发表时间：
2004-12
影响因子：
3.2
通讯作者：
V. Sankaranarayanan;S. M. Yoon;Dong-Yu Kim;Chong‐Oh Kim;Chong‐Oh Kim
中科院分区：
文献类型：
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作者：
V. Sankaranarayanan;S. M. Yoon;Dong-Yu Kim;Chong‐Oh Kim;Chong‐Oh Kim
NiFe/FeMn/NiFe三层结构构成了许多具有FeMn反铁磁层的常规和隧道磁阻自旋阀结构的组成部分。在射频磁控溅射多层膜中，系统地研究了NiFe/FeMn/NiFe三层结构中种子层和顶部钉扎NiFe层的交换偏置随三层厚度的变化。X射线衍射图显示了NiFe和FeMn层的(111)织构，这是形成反铁磁性γ-fcc相所必需的。在三种磁性层的厚度变化研究中，种子NiFe层的偏置(150Oe)大于顶部钉扎的NiFe层(仅800Oe)。在低厚度的初始极大值之后，交换偏置表现出预期的增加NiFe层厚度的1/t行为。另一方面，在FeMn反铁磁层厚度的变化中，达到5 nm厚度左右的大偏置值几乎保持到了5 nm的厚度.
NiFe∕FeMn∕NiFe trilayer structure forms an integral part of many conventional and tunneling magnetoresistance spin valve structures with FeMn antiferromagnetic layer. A systematic investigation of the exchange bias variations of the seed and top pinned NiFe layers in the NiFe∕FeMn∕NiFe trilayer structure is reported as a function of thickness of all the three constituting layers, in multilayers prepared by rf magnetron sputtering. X-ray diffraction patterns show the (111) texture for the NiFe and FeMn layers, necessary for the development of antiferromagnetic γ-fcc phase. In thickness variation studies of all the three magnetic layers, seed NiFe layer shows greater bias (150Oe) than the top pinned NiFe layer (80Oe only). The exchange bias shows the expected 1∕t behavior for increasing NiFe layer thickness after initial maxima at low thickness. In the FeMn antiferromagnet layer thickness variation on the other hand, the large bias values attained around 5nm thickness is nearly retained up to a thickness of...