Structural origin of magnetic anisotropy in Co-Pt alloy films probed by polarized XAFS
Structural origin of magnetic anisotropy in Co-Pt alloy films probed by polarized XAFS
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偏振 XAFS 探测 Co-Pt 合金薄膜中磁各向异性的结构起源
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
S. Colonna
中科院分区：
文献类型：
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作者：
Carlo Meneghini;Mireille Maret;V. Parasote;M. Cadeville;J. Hazemann;R. Cortès;S. Colonna
摘要：在CoK和PtL3边缘的偏振X射线吸收精细结构(XAFS)测量表明，外延fcc CoPt3(111)薄膜的垂直磁各向异性源于各向异性局域有序的存在。这种有序是在共沉积过程中诱导的，依赖于生长温度，其特征是薄膜平面内的CoCo对择优，面外的CoCo对平衡，这是由于某些Co2D偏析造成的。在外延的HCP Co3Pt(0001)薄膜中，铂边缘的极化XAFS显示出类似的各向异性局域有序，表现出比体相HCP Co更大的磁晶各向异性。此外，只有表现出HCP对称性的Co3PT薄膜的CoXANES分布与极化有关。
Abstract:Polarized X-ray absorption fine structure (XAFS) measurements at the Co K and Pt L3 edges show that the perpendicular magnetic anisotropy found in epitaxial fcc CoPt3 (111) films stems from the existence of anisotropic local ordering. Such ordering, induced during the codeposition process and dependent on the growth temperature, is characterized by preferential CoCo pairs in the film plane, balanced by preferential CoPt pairs out of the plane, resulting from some Co 2D-segregation. Polarized XAFS at the Pt edge reveals similar anisotropic local ordering in epitaxial hcp Co3Pt (0001) films exhibiting a larger magnetocrystalline anisotropy compared to that of bulk hcp Co. Besides, a polarization dependence of the Co XANES profile is observed only for the Co3Pt films exhibiting hcp symmetry.