Microwave assisted magnetic recording head and magnetic data storage apparatus

摘要

To suppress a spread of not only a recording magnetic field generated from a main pole but also a high-frequency magnetic field generated from a spin torque oscillator in a microwave assisted magnetic recording head. The main pole and the spin torque oscillator are surrounded by a trailing shield layer and are also surrounded by a side/leading shield layer with an insulator sidegap layer interposed therebetween, and a high-frequency magnetic field shield layer, which absorbs a high-frequency magnetic field generated from the spin torque oscillator, is arranged in at least part of the shield layers.

主权项

1. A magnetic head comprising:
a main pole configured to generate a recording magnetic field; a spin torque oscillator arranged around the main pole and configured to generate a high-frequency magnetic field; and a shield layer arranged in a manner surrounding the main pole and the spin torque oscillator, wherein the shield layer partially includes a high-frequency magnetic field shield layer, the high-frequency magnetic field shield layer including a material that absorbs the high-frequency magnetic field; the high-frequency magnetic field shield layer includes a magnetic layer with a stacked structure of soft magnetic material layers that are stacked with a spacer interposed therebetween, and a permeability of the stacked structure becomes zero at a frequency greater than or equal to 11 GHz.