How are magnetic glass thin films used in recording media and disk-recording heads?

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Magnetic glasses, which are typically iron-rich amorphous solids, are utilized in magnetic recording technology due to their unique physical and magnetic properties.1

In the context of recording media and disk-recording heads, thin films of magnetic glass are employed because they are magnetically soft—meaning they can be easily magnetized by small magnetic fields—and possess high electrical resistance. This high resistance, a direct result of their disordered atomic-scale structure, is particularly advantageous as it helps minimize unwanted electrical eddy currents and reduces energy losses during operation. These characteristics make them highly effective for both the storage media used in digital recording and the specialized heads required for reading and writing data on magnetic disks.1