Question

Identify which is not a property of a ferromagnetic material.
A) it contains magnetic domains
B) it has magnetic atoms
C) it can become a permanent magnet
D) it can be magnetised by a magnetic field
E) it contains aluminium

Answer 1

Hint: Ferromagnetism takes its name from the term "ferrous," which refers to iron, which was the first metal discovered to have magnetic field-attractive characteristics. Ferromagnetism is a magnetic property that some materials, such as iron, cobalt, alloys, and others, have. It's a phenomenon in which certain materials develop persistent magnetic or attractive properties. It's also known as a process in which electrically uncharged elements aggressively attract one another. Ferromagnetism is a characteristic that takes into consideration not just a material's chemical make-up, but also its microstructure and crystalline structure.

Complete Step By Step Answer:
Atomic dipoles in tiny areas termed domains in an unmagnetized ferromagnetic material are oriented in the same direction. Even in the absence of an external magnetising field, the domains have a net magnetic moment. The magnetic moments of neighbouring domains, on the other hand, are in opposing directions. They cancel each other out, resulting in the material's net magnetic moment being zero. When an external magnetic field is applied, all of these domains align in the direction of the applied field. The material is strongly magnetised in a direction parallel to the magnetising field as a result of this process.
A ferromagnetic material's atoms have a spin associated with them, making it magnetic. In the absence of an external magnetic field, groups of coordinated spins develop within the material. Each domain has a distinct spin, and the net magnetic field is zero. The spins of the domains realign with the magnetic field in the presence of an external magnetic field, and the material exhibits magnetic characteristics. As a result, the material has a lot of magnetic properties. When a strong magnetic field is applied for a long time, certain domains keep their spin, allowing the magnetic field to remain in the material and turning it to a permanent magnet.
Few famous ferromagnetic materials are iron, nickel, cobalt and their alloys.
Hence option E is correct.

Note:
Ferromagnetic materials are a class of materials that, when exposed to a magnetic field, tend to express or display significant magnetism in the direction of the field. The alignment patterns of these materials' component atoms are primarily responsible for their magnetic properties. These atoms have a tendency to act like basic electromagnets.