Room-temperature intrinsic ferromagnetism of two-dimensional Na2Cl crystals originated by s- and p-orbitals

• DOI: 10.48550/arxiv.2401.07524
• Publication Date: 2024-01-01
• Authors: Yimin Zhao; Yunzhang Li; Liang Chen; Quan Zhang; Xing Liu; Yizhou Yang; Ruobing Yi; Lihao Zhang; Zhenglin He; Yinwei Qiu; Dexi Nie; Fanghua Tian; Zhe Wang; Zhiwei Yang; Lei Zhang; Guosheng Shi; Shengli Zhang; Haiping Fang

Ferromagnetism, as one of the most valuable properties materials, has attracted sustained and widespread interest in basic applied research from ancient compasses to modern electronic devices. Traditionally, intrinsic ferromagnetism been attributed permanent magnetic moment induced by partially filled d- or f-orbitals. However, development ferromagnetic materials limited this structure convention. Thus, identification additional that are not constrained conventional rule but also exhibit is highly expected may impact all fields based on ferromagnetism. Here, we report direct observation room-temperature two-dimensional (2D) Na2Cl crystals, which there only s- p-orbitals rather than f-orbitals, using superconducting quantum interference device (SQUID) force microscope (MFM). These crystals formed reduced graphene oxide (rGO) membranes have an unconventional stoichiometric leading unique electron spin distributions. And these 2D including Na Cl sites, characterized situ for first time directly observed cryo-electron microscopy (cryo-EM) difference contrast between stacked with single Na. findings break provide new insights into design novel devices transistors a size down atomic scale.