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

Author:
Chowdhury, P.   Kulkarni, P. D.   Krishnan, M.   Barshilia, Harish C.   Sagdeo, A.   Rai, S. K.   Lodha, G. S.   Sridhara Rao, D. V.  


Journal:
Journal of Applied Physics


Issue Date:
2012


Abstract(summary):

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 (t Co). In the region I, with t Co< 6Aring, 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 t Co, 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 Aring < t Co< 12 Aring) for multilayer stacks with Ta underlayer. In the region III, with t Co > 12 Aring, the magneto-elastic effect emerges as an interface phenomena and the shape anisotropy becomes dominant.


Page:
023912


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