Time resolved scanning Kerr microscopy of flux beam formation in hard disk write heads
Valkass, Robert Alexander James
Spicer, Timothy M
Burgos Parra, Erick
Hicken, Robert James
Bashir, Muhammad A
Gubbins, Mark A
Czoschke, Peter J
Journal of Applied Physics
American Institute of Physics (AIP)
To meet growing data storage needs, the density of data stored on hard disk drives must increase. In pursuit of this aim the magnetodynamics of the hard disk write head must be characterized and understood, particularly the process of “flux beaming”. In this study, seven different configurations of perpendicular magnetic recording (PMR) write heads were imaged using time-resolved scanning Kerr microscopy, revealing their detailed dynamic magnetic state during the write process. It was found that the precise position and number of driving coils can significantly alter the formation of flux beams during the write process. These results are applicable to the design and understanding of current PMR and next-generation heat-assisted magnetic recording (HAMR) devices, as well as being relevant to other magnetic devices.
The authors gratefully acknowledge financial support from the Seagate Plan.
This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record.
The underlying research dataset supporting this publication is available under a Creative Commons Attribution-ShareAlike 4.0 International License (https://creativecommons. org/licenses/by-sa/4.0/) and can be publicly accessed in Open Research Exeter via the following persistent identifier: http://hdl.handle.net/10871/21108.
Vol. 119: 233903