Tailoring the Nature of Magnetic Coupling of Fe-Porphyrin Molecules to Ferromagnetic Substrates
Tailoring the Nature of Magnetic Coupling of Fe-Porphyrin Molecules to Ferromagnetic Substrates
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DOI：
10.1103/physrevlett.102.047202
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发表时间：
2009-01-30
影响因子：
8.6
通讯作者：
Wende, H.
中科院分区：
文献类型：
--
作者：
Bernien, M.;Miguel, J.;Wende, H.
我们证明了顺磁性铁卟啉分子与Cu（100）衬底上的Co-Co和Ni磁性薄膜之间的反铁磁耦合可以通过原子氧的中间层来建立。耦合能量已被确定从X射线磁性圆二色性测量的温度依赖性。通过密度泛函理论+U计算的耦合机制被证明是超交换之间的Fe中心的分子和Co表面原子，介导的氧。
We demonstrate that an antiferromagnetic coupling between paramagnetic Fe-porphyrin molecules and ultrathin Co and Ni magnetic films on Cu(100) substrates can be established by an intermediate layer of atomic oxygen. The coupling energies have been determined from the temperature dependence of x-ray magnetic circular dichroism measurements. By density functional theory+U calculations the coupling mechanism is shown to be superexchange between the Fe center of the molecules and Co surface-atoms, mediated by oxygen.