The study reports the observation of Majorana fermions in ferromagnetic atomic chains on a superconductor. Researchers fabricated ferromagnetic iron (Fe) atomic chains on the surface of superconducting lead (Pb) and used high-resolution spectroscopic imaging techniques to detect zero energy end states, which are signatures of topological superconductivity and edge-bound Majorana fermions. The findings provide strong evidence for the formation of a topological phase in the atomic chains, with Majorana fermions localized at the edges. The research highlights the importance of spin-orbit coupling and ferromagnetic interactions in creating a topological superconducting state. The Fe chains, placed on Pb, exhibit a structure that is incommensurate with the Pb surface, and the spin texture of the chains emulates the combination of spin-orbit and Zeeman interactions necessary for topological superconductivity. The study demonstrates that the essential ingredients for topological superconductivity in this system are the ferromagnetic interaction between Fe atoms and the strong spin-orbit interaction in superconducting Pb. The researchers used scanning tunneling microscopy (STM) to study the electronic structure of the Fe chains and observed a zero bias peak (ZBP) at the ends of the chains, which is a signature of Majorana fermions. The ZBP was localized at the ends of the chains and was not observed in the bulk of the chains, indicating that the Majorana fermions are indeed localized at the edges. The study also confirmed that the ZBP is associated with superconductivity and not with other phenomena such as the Kondo effect. The findings demonstrate that the Fe chains on Pb can be used as a platform for realizing topological superconductivity and detecting Majorana fermions. The study provides experimental evidence for the existence of Majorana fermions in a one-dimensional system and supports the theoretical predictions of their behavior in topological superconductors. The results have implications for the development of fault-tolerant quantum computing, as Majorana fermions are promising candidates for qubits due to their non-Abelian characteristics.The study reports the observation of Majorana fermions in ferromagnetic atomic chains on a superconductor. Researchers fabricated ferromagnetic iron (Fe) atomic chains on the surface of superconducting lead (Pb) and used high-resolution spectroscopic imaging techniques to detect zero energy end states, which are signatures of topological superconductivity and edge-bound Majorana fermions. The findings provide strong evidence for the formation of a topological phase in the atomic chains, with Majorana fermions localized at the edges. The research highlights the importance of spin-orbit coupling and ferromagnetic interactions in creating a topological superconducting state. The Fe chains, placed on Pb, exhibit a structure that is incommensurate with the Pb surface, and the spin texture of the chains emulates the combination of spin-orbit and Zeeman interactions necessary for topological superconductivity. The study demonstrates that the essential ingredients for topological superconductivity in this system are the ferromagnetic interaction between Fe atoms and the strong spin-orbit interaction in superconducting Pb. The researchers used scanning tunneling microscopy (STM) to study the electronic structure of the Fe chains and observed a zero bias peak (ZBP) at the ends of the chains, which is a signature of Majorana fermions. The ZBP was localized at the ends of the chains and was not observed in the bulk of the chains, indicating that the Majorana fermions are indeed localized at the edges. The study also confirmed that the ZBP is associated with superconductivity and not with other phenomena such as the Kondo effect. The findings demonstrate that the Fe chains on Pb can be used as a platform for realizing topological superconductivity and detecting Majorana fermions. The study provides experimental evidence for the existence of Majorana fermions in a one-dimensional system and supports the theoretical predictions of their behavior in topological superconductors. The results have implications for the development of fault-tolerant quantum computing, as Majorana fermions are promising candidates for qubits due to their non-Abelian characteristics.