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It has been proposed that a line junction between spiral magnet andsuperconductor or between ferromagnet and superconductor with Rashbaspin-orbital coupling can produce Majorana zero mode (MZM) at the ends of theline. However, a strong magnetic exchange coupling between the magnetic atomsand the superconductor (about half of the bandwidth of the superconductor) isneeded to obtain MZM. Here, we design devices to reduce the needed magneticexchange coupling. In the first proposal, we cover a very narrow $s$-wavesuperconducting wire formed by a monolayer film or a layered material (such asFeSe or FeSe monolayer on SrTiO$_3$) with \emph{isolated} magnetic atoms. Inour second proposal, we place a line of \emph{isolated} magnetic \emph{ions} ona monolayer superconductor or a \emph{layered} superconductor (such as FeSe).We show that, in the above devices, a spiral magnetic order will developspontaneously to produce a 1D $p$-wave topological superconductor with asizable gap (above 1/2 of the parent superconducting gap), even for a weakmagnetic exchange coupling (less than 1/10 of the bandwidth). The topologicalsuperconductor has MZM at ends of the wire.

Realizing Majorana zero mode with a stripe of \emph{ionized} and \emph{isolated} magnetic atoms on a \emph{layered} superconductor