  Skyrmions having topologically protected field configurations with
particle-like properties play an important role in various field of science.
Our present study focus on the generation of skyrmion from spin spiral in the
magnetic multilayers of 4d-Fe/Ir(111) with 4d = Y, Zr, Nb, Mo, Ru, Rh. Here we
investigate the impact of 4d transition metals on the isotropic Heisenberg
exchanges and anti-symmetric Dzyaloshinskii-Moriya interactions originating
from the broken inversion symmetry at the interface of 4d-Fe/Ir(111)
multilayers. We find a strong exchange frustration due to the hybridization of
the Fe-3d layer with both 4d and Ir-5d layers which modifies due to band
filling effects of the 4d transition metals. We strengthen the analysis of
exchange frustration by shedding light on the orbital decomposition of
isotropic exchange interactions of Fe-3d orbitals. Our spin dynamics and Monte
Carlo simulations indicate that the magnetic ground state of 4d-Fe/Ir(111)
transition multilayers is a spin spiral in the $ab$-plane with a period of 1 to
2.5 nm generated by magnetic moments of Fe atoms and propagating along the
$a$-direction. The spiral wavelengths in Y-Fe/Ir(111) are much larger compared
to Rh-Fe/Ir(111). In order to manipulate the skyrmion phase in 4d-Fe/Ir(111),
we investigate the magnetic ground state of 4d-Fe/Ir(111) transition
multilayers with different external magnetic field. An increasing external
magnetic field of $\sim$ 12 T is responsible for deforming the spin spiral into
a isolated skyrmion which flips into skyrmion lattice phase around $\sim$ 18 T
in Rh-Fe/Ir(111). Our study predict that the stability of magnetic skyrmion
phase in Rh-Fe/Ir(111) against thermal fluctuations is upto temperature T $\leq
90$ K.
