Monolayers of 3d-Metal Antimonides, their Preparation and Magnetic Properties

研究了M/Sb（M：Cr，Mn，Fe，Co，Ni）多层膜的结构和磁性。在Mn、Ni和Cr反应性较高的情况下，得到了含有NiAs型3d金属锑化物MSb单层的样品。它们显示出有趣的磁性。1. Mn/Sb多层膜中的界面反应性最强。当衬底温度为-100 ℃（Ts=-100 ℃）时，界面处仍有MnSb生成。本文对标称厚度为[Mn（1A ~+）/Sb（500 A ~+）]_<90>（Ts=R.T.）用x射线衍射和截面透射电镜研究了MnSb单分子膜的结构。MnSb单层膜表现出铁磁性，其长程有序在80 K以下完成。即使在80 K以下，由于二维的存在，磁化强度也会出现波动. Cr/Sb界面的反应性是适中的。当衬底温度保持在80 ℃时，获得了CrSb外延单层膜. CrSb单分子膜表现出弱的铁磁性，而体相CrSb表现出反铁磁性. Ni/Sb界面的反应活性与Mn/Sb界面相当，但由于Ni Sb与Sb之间存在较大的晶格失配，NiSb单层的结晶性较差，表现出弱的顺磁性. Co/Sb和Fe/Sb界面的反应性太低，即使当Ts为100 μ C时也无法获得CoSb和FeSb单层。

Structural and magnetic properties of M/Sb ( M : Cr, Mn, Fe, Co and Ni ) multilayered films have been investigated. Reactivities of their interfaces vary in a wide range.In the case of Mn, Ni and Cr with higher reactivity, samples containing monolayers of NiAs-type 3d-metal antimonide MSb are obtained. They show interesting magnetic properties.1. Interfaces in Mn/Sb multilayered films are the most reactive. Even when substrate was kept at -1OOﾟC ( Ts=-100ﾟC ), MnSb is formed at the interfaces. A sample with nominal thickness of [Mn(lA^ﾟ)/Sb(500A^ﾟ)]_<90> (Ts=R.T.) contains MnSb monolayers epitaxially grown.The structures of MnSb monolayers have been revealed by x-ray diffraction and cross-sectional TEM. MnSb monolayeres show a ferromagnetism, of which long range order is completed below 80K. Even below 80K, magnetization shows a fluctuation because of 2-dimensionality.2. The reactivity of Cr/Sb interfaces is a modest one. Epitaxial CrSb monolayers are obtained when substrate was kept at 80ﾟC. CrSb monolayers show a weak ferromagnetism whereas bulk CrSb shows antiferromagnetism.3. The reactivity of Ni/Sb interfaces is comparable with that of Mn/Sb interfaces.However, crystillinity of NiSb monolayers is not so good because of a large lattice misfit between NiSb and Sb. NiSb monolayers show a weak paramagnetism as well as bulk NiSb.4. Reactivities of Co/Sb and Fe/Sb interfaces are too low even when Ts is 100ﾟC to obtain CoSb and FeSb monolayers.