Magnetic systems refer to arrangements of materials that exhibit magnetic properties, primarily due to the alignment of their atomic magnetic moments. These systems can be classified into different types, such as ferromagnetic, antiferromagnetic, and paramagnetic, based on how their magnetic moments interact with each other. Common examples include magnets used in everyday items and the magnetic fields generated by electric currents. In a magnetic system, the behavior of materials can change with temperature and external magnetic fields. For instance, ferromagnetic materials like iron can become magnetized when exposed to a magnetic field, while paramagnetic materials only exhibit magnetism in the presence of an external field. Understanding these systems is crucial for applications in electronics, data storage, and medical imaging technologies.