Paramagnetism is a form of magnetism that occurs in materials that are weakly attracted by an external magnetic field. This phenomenon arises due to the presence of unpaired electrons in the atomic structure of the material, which align with the magnetic field, causing a net magnetic moment. Common examples of paramagnetic materials include aluminum and oxygen. Unlike ferromagnetic materials, which retain their magnetism after the external field is removed, paramagnetic materials only exhibit magnetism in the presence of an external field. When the field is removed, the magnetic alignment disappears, and the material returns to its non-magnetic state. This behavior is crucial in various applications, including MRI technology and magnetic resonance studies.