Accession Number:

ADA371285

Title:

Size and Shape Effects in Shrinking Submicron Magnetic Memory and Logic

Descriptive Note:

Final rept. 15 Jun 96-30 Nov 99

Corporate Author:

NEBRASKA UNIV LINCOLN

Report Date:

1999-11-30

Pagination or Media Count:

12.0

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 CoPd 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 CoPd multilayer arrays, characterizing reversal dynamics, and mapping magnetic features.

Subject Categories:

  • Properties of Metals and Alloys
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE