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Using both an effective three-band model and {\it ab initio} calculations, wehave investigated various topological features in the cubic ferromagnetic$5d^{1,2}$ systems showing large spin-orbit coupling (SOC): Ba$_2$NaOsO$_6$,Sr$_2$SrOsO$_6$, and Ba$_2$$B$ReO$_6$ ($B$= Mg, Zn). In the presence oftime-reversal symmetry (${\cal T}$), spinless Dirac nodal loops linked to eachother at the $W$ points appear in the mirror planes. Remarkably, breaking${\cal T}$ leads to spinful magnetic Weyl nodal loops (MWNLs) that are robusteven at large SOC and correlation strength $U$ variation due to the combinationof mirror symmetry and broken ${\cal T}$. Additionally, there are two types ofmagnetic Weyl points with chiral charges $|\chi|=1, 2$ along the $C_{4v}$symmetry line, and another type-II MWNL encircling the zone center, that aredependent on $U$. Furthermore, the ferromagnetic Ba$_2$ZnReO$_6$ is an idealhalf semimetal with MWNLs and magnetic Weyl nodes at the Fermi level withoutthe interference of topologically trivial bulk states. These systems give riseto a remarkably large anomalous Hall conductivity $\sigma_{xy}$ of up to 1160($\Omega$cm)$^{-1}$. Our findings may apply widely for $t_{2g}$ systems withcubic (or slightly distorted) fcc-like structures.

Symmetry-protected Spinful Magnetic Weyl Nodal Loops and Multi-Weyl Nodes in $5d^n$ Cubic Double Perovskites $(n=1,2)$