Herein, the filling of single‐walled carbon nanotubes (SWCNTs) with sulfur is performed, and the magnetic properties of the formed nanomaterials are studied. Encapsulation of sulfur species results in the appearance of a specific magnetic ordering in the system due to the formation of nanoscopic grains composed of sulfur and residual catalytic Fe nanoparticles contained in the SWCNTs. The magnetic character of the obtained 1D nanostructures is studied using superconducting quantum interference device (SQUID) magnetometer and a sequential ferromagnetic–antiferromagnetic ordering in the material is revealed. Magnetic and optical properties are strongly dependent on the synthesis protocols. A significant Raman intensity increase related to the encapsulated nanostructures is obtained when filling is performed at high‐pressure high‐temperature conditions. Simultaneously, the magnetic susceptibility gets strongly reduced for high‐pressure filling, which is related to the escape of iron particles from the nanotube interior, and the magnetic properties of the material are governed by a weak ferromagnetic ordering of Fe–S structures remained inside SWCNTs. Sulfur encapsulation provides the new route for controlling the magnetic properties in 1D nanomaterials that pave the way for advanced magneto‐optical applications.

中文翻译：

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单壁碳纳米管内部形成的一维铁硫化合物的磁性

在此，用硫填充单壁碳纳米管（SWCNT），并研究了所形成的纳米材料的磁性。由于形成了由硫和SWCNT中包含的残留催化性Fe纳米颗粒组成的纳米晶粒，硫物质的封装导致系统中出现特定的磁序。使用超导量子干涉仪（SQUID）磁力计研究了获得的一维纳米结构的磁性，并揭示了材料中的铁磁-反铁磁顺序。磁性和光学性质在很大程度上取决于合成方案。当在高压高温条件下进行填充时，与封装的纳米结构有关的拉曼强度显着增加。同时，高压填充的磁化率大大降低，这与铁颗粒从纳米管内部逸出有关，并且材料的磁性能由SWCNT内部残留的Fe–S结构的弱铁磁有序控制。硫包封为控制一维纳米材料的磁性提供了新途径，为高级磁光应用铺平了道路。并且材料的磁性能由SWCNT内部残留的Fe–S结构的弱铁磁有序控制。硫包封为控制一维纳米材料的磁性提供了新途径，为高级磁光应用铺平了道路。并且材料的磁性能由SWCNT内部残留的Fe–S结构的弱铁磁有序控制。硫包封为控制一维纳米材料的磁性提供了新途径，为高级磁光应用铺平了道路。