We predict robust Ising ferromagnetism driven by Coulomb interaction in the metallic phase of twisted transition metal dichalcogenide homobilayers for a range of small twist angles. Due to the presence of spin-valley locking and a Chern band, the completely spin-polarized state—a half metal—has a spin gap and exhibits the anomalous Hall effect. We also find that near a magic angle where the Chern band is predicted to be exceptionally flat, the anomalous Hall metal at $1/3$ filling may become unstable at low temperature and change into a $\sqrt{3}\times \sqrt{3}$ charge density wave or a fractional Chern insulator.

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• Anomalous Hall effect
• Chern insulators
• Ferromagnetism
• Half-metals
• Transition metal dichalcogenides
• Twisted heterostructures