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Spacer layer thickness dependence of exchange coupling in Co-enriched Co-Mn-Si/Cr/Co-Mn-Si epitaxial trilayers.
- Source :
- Journal of Applied Physics; Dec2011, Vol. 110 Issue 11, p113901, 6p, 1 Black and White Photograph, 5 Graphs
- Publication Year :
- 2011
-
Abstract
- Interlayer exchange coupling was investigated in highly Co-enriched (75.6 at. %), i.e., in Co antisite defective Heusler alloy Co-Mn-Si-based epitaxial trilayer structures for a wide range of spacer Cr thicknesses (tCr). The exchange coupling parameters J1 (bilinear coupling) and J2 (90° coupling) were estimated from the comparison of experimental and numerical simulations of M-H loops. The comparable contributions of both the bilinear and 90° couplings were observed in a spacer thickness range, tCr ∼ 0.3 to 4.2 nm. The relative angle of magnetization at remanence between the bottom and top Co-Mn-Si layers was found to vary from 67° to a maximum of 152° as a result of competition between bilinear and 90° couplings. In contrast to the observation of strong 90° coupling without any detectable bilinear type 180° coupling in almost stoichiometric and chemically B2-ordered Co2MnSi-based trilayer structures in a previous study, the results in this study clearly indicated the importance of the effect of chemical ordering on dominating 90° coupling in Heusler alloy-based structures. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 110
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 69703028
- Full Text :
- https://doi.org/10.1063/1.3663362