Back to Search
Start Over
Large uniaxial magnetic anisotropy by lattice deformation in CoPt/Ru perpendicular films.
- Source :
- Journal of Applied Physics; 4/15/2006, Vol. 99 Issue 8, p08G908, 3p, 1 Black and White Photograph, 5 Graphs
- Publication Year :
- 2006
-
Abstract
- A large uniaxial magnetic anisotropy K<subscript>u</subscript> of about 2×10<superscript>7</superscript> erg/cm<superscript>3</superscript> was obtained in Co–(20–30) at. % Pt perpendicular films deposited on Ru seed layers. The films showed good c-axis orientation perpendicular to the film plane, and no evidence of a Co<subscript>3</subscript>Pt-type-ordered structure was found in the X-ray-diffraction patterns. The value of K<subscript>u</subscript> (the sum of the first- and second-order terms of uniaxial anisotropy, K<subscript>u1</subscript> and K<subscript>u2</subscript>) increased as the thickness of the CoPt layer decreased, and reached about 2×10<superscript>7</superscript> erg/cm<superscript>3</superscript> at 2 nm (Co–20 at. % Pt films) or 5 nm (Co–(25–30) at. % Pt films). The ratio of K<subscript>u2</subscript> to K<subscript>u1</subscript> was 0.16 in 40 nm films, but reduced to less than 0.03 for thicknesses below 5 nm. The experimental results suggest that, besides the surface anisotropy, the increase in K<subscript>u</subscript> on reducing the thickness is mostly related to the reduction of the hcp-CoPt lattice c/a ratio, probably due to epitaxial growth of CoPt on the Ru seed layer. [ABSTRACT FROM AUTHOR]
- Subjects :
- ANISOTROPY
PROPERTIES of matter
MAGNETISM
EPITAXY
CRYSTAL growth
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 99
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 21125900
- Full Text :
- https://doi.org/10.1063/1.2167351