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首页> 外文期刊>The Journal of Chemical Physics >Preparation and magnetic properties of manganese(II) phthalocyanine thin films
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Preparation and magnetic properties of manganese(II) phthalocyanine thin films

机译：锰酞菁薄膜的制备及磁性

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摘要

We report the molecular beam epitaxy (MBE) growth of the manganese(II) phthalocyanine thin films with unique crystal structure and the measurement of their magnetic properties. The epitaxial films were grown on hydrogen-terminated Si(111) substrates. Reflection high energy electron diffraction observations showed that the crystal structure of the films is different from that of the bulk crystal. A large magnetic anisotropy was observed in the measurements with the SQUID magnetometer. The films did not show canted ferromagnetism which is usually observed in the beta-type crystal of manganese phthalocyanine. The magnetic susceptibility measured with magnetic field normal to the substrate obeyed the Curie-Weiss law with a negative Curie-Weiss constant, indicating the existence of the antiferromagnetic interaction. The negative Curie-Weiss constant was also observed in disordered films of manganese phthalocyanine. The variation of magnetic properties between the bulk crystal and the films is explained in terms of the difference in superexchange interaction caused by microscopic modification of the crystal structure, i.e., the stacking arrangement of the molecules. (C) 1998 American Institute of Physics. [References: 28]
机译：我们报告具有独特的晶体结构的锰（II）酞菁薄膜的分子束外延（MBE）生长及其磁性能的测量。外延膜生长在氢封端的Si（111）衬底上。反射高能电子衍射观察表明，膜的晶体结构与块状晶体不同。用SQUID磁力计测量时观察到较大的磁各向异性。这些膜没有显示出倾斜的铁磁性，通常在锰酞菁的β型晶体中观察到。用垂直于衬底的磁场测得的磁化率遵循居里-魏斯定律，居里-魏斯常数为负，表明存在反铁磁相互作用。在锰酞菁的无序薄膜中也观察到负居里-魏斯常数。根据晶体结构的微观修饰即分子的堆叠排列所引起的超交换相互作用的差异来解释块状晶体与膜之间的磁性质的变化。 （C）1998美国物理研究所。 [参考：28]

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