Size and Shape Effects in Shrinking Submicron Magnetic Memory and Logic
Abstract
The research is based on radiation-induced selective area fabrication (using metallocenes) of large arrays of micrometer sub-micrometer scale ferromagnetic features and on magnetic characterization as a function of size and shape. With 100 keV electrons we fabricated highly uniform 8nm features. With light we fabricated many sizes and shapes of identical micrometer-scale magnetic features (Ni, Fe, Co, CrO2, and Co/Pd multilayers) in large arrays, quickly, cleanly and at ambient temperatures. We used alternating gradient force magnetometry, MFM and MOKE and showed that in-plane magnetization depends on feature size and shape. Coercivities are higher for bar-shaped Ni features than for 4-fold or nearly circularly symmetric ones, but less than predicted. Pinning contributes little to coercivity in multidomain Ni features with low remanence. Growth conditions affect microstructure substantially but influence coercivity much less than patterning does, even on the micrometer-scale. We are now modeling Co/Pd multilayer arrays, characterizing reversal dynamics, and mapping magnetic features.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1999
- Accession Number
- ADA371285
Entities
People
- Brian W. Robertson
- Peter A Dowben
Organizations
- University of Nebraska–Lincoln