What is the term for when groups of atoms align their magnetic fields in a common direction?

What is the term for when groups of atoms align their magnetic fields in a common direction?

• A. Domain
• B. Alignment of magnetic fields
• C. Ferromagnetism
• D. Magnetization

Answer: (A)

In ferromagnetic materials, groups of atoms align their magnetic moments in the same direction within regions called domains. Inside each domain, the moments point together, making that region behave like a tiny magnet. The whole piece contains many such domains, often oriented in different directions, which is what keeps a non-magnetized sample from showing a strong external magnetic field. The term for these regions is domain, which is why this choice is the best answer. The other ideas describe the general act of alignment (not a specific region), the material type that exhibits this behavior (ferromagnetism), or the overall magnetic moment resulting from all aligned domains (magnetization).

In ferromagnetic materials, groups of atoms align their magnetic moments in the same direction within regions called domains. Inside each domain, the moments point together, making that region behave like a tiny magnet. The whole piece contains many such domains, often oriented in different directions, which is what keeps a non-magnetized sample from showing a strong external magnetic field. The term for these regions is domain, which is why this choice is the best answer. The other ideas describe the general act of alignment (not a specific region), the material type that exhibits this behavior (ferromagnetism), or the overall magnetic moment resulting from all aligned domains (magnetization).