Effect of Coil Position on Magnetization Dynamics of Multilayered Hard Disk Writer Yokes

Three partially built hard disk writer structures with active coil windings located at different positions relative to the yoke were studied by time resolved scanning Kerr microscopy. All three Cartesian components of the magnetization were recorded simultaneously. Time resolved signals recorded nea...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on magnetics 2013-07, Vol.49 (7), p.3741-3744
Main Authors: Yu, Wei, Keatley, Paul S., Hicken, Rob J., Gubbins, Mark A., Czoschke, Peter J., Lopusnik, Radek
Format: Article
Language:English
Subjects:
Coils
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Flux beaming
Magnetic heads
Magnetic multilayers
Magnetism
Magnetization
Materials science
Microscopy
MOKE
Other topics in materials science
Physics
Stationary state
Windings
yoke
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Three partially built hard disk writer structures with active coil windings located at different positions relative to the yoke were studied by time resolved scanning Kerr microscopy. All three Cartesian components of the magnetization were recorded simultaneously. Time resolved signals recorded near the pole tip showed that the component of magnetization parallel to the driving field had the same rise time irrespective of the location of the coil winding, but largest amplitude when the active coil was located near the middle of the yoke. Dynamic images obtained from three devices showed "flux beaming" in a channel parallel to the driving field. The magnetic contrast was strongest when the active coil was located near the centre of the yoke, while relaxation after removal of the excitation was most complete when the active coil was located near the confluence region. These results confirm the need for a multiturn coil to ensure effective flux propagation along the entire length of the yoke.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2013.2248349