Magnetic Dipole and Higher Pole Interaction on a Square Lattice
Magnetic Dipole and Higher Pole Interaction on a Square Lattice
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DOI：
10.1103/physrevlett.110.177209
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发表时间：
2013-04-26
影响因子：
8.6
通讯作者：
Zabel, Hartmut
中科院分区：
文献类型：
--
作者：
Ewerlin, Melanie;Demirbas, Derya;Zabel, Hartmut
研究了正方形晶格上具有偶极特征的圆形磁岛的磁相互作用。正方形图案由光刻制备的多晶PdFe岛组成，直径为150 nm，周期为300 nm。低于居里温度在260 K，岛是在一个单一的域状态与各向同性的面内磁化。低于160 K时，有一个发病的相互作用，导致的形状的变化的滞后，增加的矫顽力，和发展的面内各向异性。具有调谐到Fe的L-3边缘的圆偏振入射X射线的光发射电子显微镜证实了磁岛的增加的相关性和细长链的形成，如Vedmedenko等人[Phys.Rev.Lett.2004]所预测的。95，207202（2005）]，用于来自比偶极相互作用更高阶的极相互作用的贡献。发现相邻链的方向不规则，平行或反平行。DOI：10.1103/PhysRevLett.110.177209
We have studied the magnetic interaction of circular magnetic islands with a dipole character on a square lattice. The square pattern consists of lithographically prepared polycrystalline PdFe islands, 150 nm in diameter and a periodicity of 300 nm. Below the Curie temperature at 260 K, the islands are in a single domain state with isotropic in-plane magnetization. Below 160 K, there is an onset of interisland interaction that leads to a change of the shape of the hysteresis, an increase of coercivity, and a development of in-plane anisotropy. Photoemission electron microscopy with circularly polarized incident x rays tuned to the L-3 edge of Fe confirms the increasing correlation of the magnetic islands and the formation of elongated chains, as predicted by Vedmedenko et al. [Phys. Rev. Lett. 95, 207202 (2005)] for contributions from pole interactions of higher order than the dipolar one. Neighboring chains are found to be irregularly oriented either parallel or antiparallel. DOI: 10.1103/PhysRevLett.110.177209