Effect of coherent to incoherent structural transition on magnetic anisotropy in Co/Pt multilayers

Chowdhury, P and Kulkarni, PD and Krishnan, M and Barshilia, Harish C and Sagdeo, A and Rai, SK and Lodha, GS and Sridhara Rao, DV (2012) Effect of coherent to incoherent structural transition on magnetic anisotropy in Co/Pt multilayers. Journal of Applied Physics, 112. 023912. ISSN 0021-8979

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The crystallographic structure and magnetic anisotropy have been investigated in Co/Pt multilayers deposited by direct current magnetron sputtering on two different buffer layers, Ta and Pt. Detail theoretical and experimental investigations reveal the presence of three effects: magneto-elastic, interface and shape anisotropies, and their competition results in three distinct regions based on the Co layer thickness (tCo). In the region I, with tCo< 6 Å, the coherent lattice strain modifies the volume anisotropy through magneto-elastic contribution and it leads to overall positive volume anisotropy energy. With further increase in tCo, lattice mismatch initiates and this results in a decrease in magneto-elastic effect and it enhances the interface anisotropy. The presence of both diminished magneto-elastic effect and enhanced interface anisotropy results in an intermediate region (region II) with negative volume anisotropy energy which is relatively wider (6 Å<tCo< 12 Å) for multilayer stacks with Ta underlayer. In the region III, with tCo> 12 Å, the magneto-elastic effect emerges as an interface phenomena and the shape anisotropy becomes dominant.

Item Type: Article
Subjects: GENERAL > General
Depositing User: Dr. Harish C. Barshilia
Date Deposited: 28 Feb 2013 05:26
Last Modified: 10 Aug 2015 05:45
URI: http://nal-ir.nal.res.in/id/eprint/11484

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