Large-Pore Mesoporous Ho3Fe5O12 Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing
Large-Pore Mesoporous Ho3Fe5O12 Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing
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DOI：
10.1021/cm5003324
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发表时间：
2014-03
影响因子：
8.6
通讯作者：
C. Suchomski;C. Reitz;D. Pajić;Z. Jagličić;I. Djerdj;T. Brezesinski
中科院分区：
文献类型：
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作者：
C. Suchomski;C. Reitz;D. Pajić;Z. Jagličić;I. Djerdj;T. Brezesinski
我们报告了蒸发诱导自组装合成的大孔介孔薄膜的亚铁磁钬铁石榴石（Ho 3Fe 5 O 12）从硝酸盐前体和聚异丁烯嵌段聚（环氧乙烷）聚合物结构导向剂。通过显微镜、散射和光谱技术，包括基于同步加速器的掠入射小角X射线散射、X射线光电子能谱、X射线衍射（包括Rietveld精修）等，研究了膜的顶表面和内部的相组成、原子键合构型和孔结构。这些数据提供了证据表明，溶胶-凝胶衍生的材料是单相石榴石，具有27 nm直径的微晶和在空气中加热到850 °C后的少量缺陷，并且在很大程度上保留了平均直径为23 nm的连续孔网络，尽管在结晶过程中从亚稳态h-HoFeO 3到Ho 3Fe 5 O 12发生了固-固转化。此外，直流磁控管…
We report the evaporation-induced self-assembly synthesis of large-pore mesoporous thin films of ferrimagnetic holmium iron garnet (Ho3Fe5O12) from nitrate salt precursors and a polyisobutylene-block-poly(ethylene oxide) polymer structure-directing agent. The phase composition, atomic bonding configuration, and pore structure of the top surface and the interior of the films were investigated by microscopy, scattering, and spectroscopy techniques, including synchrotron-based grazing incidence small-angle X-ray scattering, X-ray photoelectron spectroscopy, X-ray diffraction (including Rietveld refinement), and others. The data provide evidence that the sol–gel-derived material is single-phase garnet with 27 nm diameter crystallites and few defects after being heated to 850 °C in air, and the continuous network of pores averaging 23 nm in diameter is preserved to a large extent, despite a solid–solid conversion from metastable h-HoFeO3 to Ho3Fe5O12 during the crystallization process. Furthermore, dc magnetom...