Sources of Anisotropy in Amorphous Magnetic Thin Films
Abstract
With the assistance of this grant, my laboratory has progressed substantially and is now beginning to produce results. This last year, in addition to lab build-up and student supervision, I have continued work on the amorphous rare earth transition metal alloys. There are several significant new results arising from this work. A model for the growth-induced macroscopic magnetic anisotropy: I have clear evidence against Takeshi Egami's Bond- Orientational Anisotropy model which attributes the anisotropy to anelastic strain . He describes this model as a simple increase in the number of bonds in- plane compared to out-of-plane due to stress during the growth. I find a strong (more than an order of magnitude) dependence of the anisotropy on deposition temperature and essentially no dependence on the state of stress either during the growth or after. I believe the reason for the anisotropy is a texturing of the short-range order relative to the surface, which minimizes surface energy at every instant during the growth, and gets frozen into the structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 17, 1990
- Accession Number
- ADA230542
Entities
People
- Frances Hellman
Organizations
- University of California, San Diego