Why does breaking a bar magnet create two smaller magnets?

Breaking a bar magnet does not isolate its north pole from its south pole because magnetic forces do not originate from discrete, submicroscopic "unit" poles, unlike electric charges. Instead, magnetism arises from the collective alignment of atomic-scale magnetic moments and ferromagnetic domains within the material.123

When you break a bar magnet, you are simply dividing the material into smaller pieces that retain this internal alignment. Each resulting fragment continues to have its own north and south poles because the underlying magnetic dipole structure remains intact throughout the material. Essentially, you have created two smaller magnets, each with its own complete set of poles, rather than isolating a single pole.14