  Ideal magnetic topological materials have great significance in both
fundamental physics and technical applications, due to their abundant exotic
quantum properties and facilitation of control. Using first-principles
calculations, we find several ideal magnetic topological materials in EuTX (T =
Cu, Ag, and Au; X= P, As, Sb, and Bi) family. Particularly, EuAuP is the
ferromagnetic Weyl semimetal, and EuAuX (X=As, Sb, and Bi) in their ground
state with in-plane moments are the antiferromagnetic semimetals hosting the
topological gap near the Fermi level. By tuning the magnetic moments to z-axis,
EuAuX (X=As, Sb, and Bi) could further evolve into triple degenerate nodal
points (TDNPs) semimetal states. The main characteristics of antiferromagnetic
TDNP semimetal, including the Fermi arcs, and tangent Fermi surfaces with
opposite spin winding numbers, are also studied. Our work provides a promising
platform to modulate the magnetism, topological electronic structures and
emergent quantum states.
