Multilevel-3D bit patterned magnetic media with 8 signal levels per nanocolumn.
This letter presents an experimental study that shows that a 3(rd) physical dimension may be used to further increase information packing density in magnetic storage devices. We demonstrate the feasibility of at least quadrupling the magnetic states of magnetic-based data storage devices by recording and reading information from nanopillars with three magnetically-decoupled layers. Magneto-optical Kerr effect microscopy and magnetic force microscopy analysis show that both continuous (thin film) and patterned triple-stack magnetic media can generate eight magnetically-stable states. This is in comparison to only two states in conventional magnetic recording. Our work further reveals that ferromagnetic interaction between magnetic layers can be reduced by combining Co/Pt and Co/Pd multilayers media. Finally, we are showing for the first time an MFM image of multilevel-3D bit patterned media with 8 discrete signal levels.
Department of Electrical Engineering, University of California Riverside, Riverside, California, United States of America. Nissim.Amos@ee.ucr.edu
Nissim
N
Amos
John
J
Butler
Beomseop
B
Lee
Meir H
MH
Shachar
Bing
B
Hu
Yuan
Y
Tian
Jeongmin
J
Hong
Davil
D
Garcia
Rabee M
RM
Ikkawi
Robert C
RC
Haddon
Dmitri
D
Litvinov
Sakhrat
S
Khizroev
D003146:Communications Media; D008280:Magnetics; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry*; D010363:Pattern Recognition, Automated; D012399:Rotation; D012815:Signal Processing, Computer-Assisted