Electromagnetic transducers such as heads for disk or tape drives commonly include
Permalloy (approximately Ni8OFe20), Which is formed in thin layers to create magnetic
features. For example, an inductive head may have conduc tive coils that induce a
magnetic? uX in an adjacent Per malloy core, that? uX employed to magnetiZe a portion or
bit of an adjacent media. That same inductive head may read signals from the media by
bringing the core near the magnetiZed media portion so that the? uX from the media portion …