NanoScan Ltd
Ueberlandstrasse 129
CH-8600 Duebendorf
Switzerland
+41 43 931 02 40
info@nanoscan.ch
Local measurements of switching field distribution on bit patterned media
Once the existing hard disk technology has reached its maximum storage density, the next generation of magnetic recording media is expected to consist of so-called “bit patterned media” or BPM. BPM consists of topographical dots written into the magnetic layer. The structure of the dots confines the magnetic bit and decouples it from its neighbors, allowing smaller bits to be written.
The above series of MFM images was taken at 10 K in increasing magnetic fields. The series demonstrates the ability of the PPMS-AFM to measure MFM images in applied magnetic fields without significant drift. The resulting series of images allows the switching field distribution of the dots to be measured for a local area. The MFM images were taken at constant average height in high resolution (non-contact) mode. Islands appearing white are magnetised opposite to the tip and dark when they are magnetised parallel to the tip. The dots have a center to center pitch of 50 nm.
Sample courtesy of Dr J. Ahner, Seagate, USA.
The above series of MFM images was taken at 10 K in increasing magnetic fields. The series demonstrates the ability of the PPMS-AFM to measure MFM images in applied magnetic fields without significant drift. The resulting series of images allows the switching field distribution of the dots to be measured for a local area. The MFM images were taken at constant average height in high resolution (non-contact) mode. Islands appearing white are magnetised opposite to the tip and dark when they are magnetised parallel to the tip. The dots have a center to center pitch of 50 nm.
Sample courtesy of Dr J. Ahner, Seagate, USA.
