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 (2). 023912-1-023912-8. ISSN 0021-8979

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    Abstract

    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 A° , 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 ˚A < tCo < 12 A˚ ) for multilayer stacks with Ta underlayer. In the region III, with tCo > 12 A˚ , the magneto-elastic effect emerges as an interface phenomena and the shape anisotropy becomes dominant.

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to Journal of Applied Physics
    Uncontrolled Keywords: Cobalt;Magnetic anisotropy;Magnetic multilayers; Magnetoelastic effects;Platinum;Sputter deposition
    Subjects: AERONAUTICS > Aeronautics (General)
    ENGINEERING > Structural Mechanics
    Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division, Surface Engineering Division, Other, Other, Other, Other
    Depositing User: Ms. Alphones Mary
    Date Deposited: 30 Jul 2012 13:24
    Last Modified: 30 Jul 2012 13:24
    URI: http://nal-ir.nal.res.in/id/eprint/10555

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