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Title: Ferromagnetic Resonance Studies of Low Damping Multilayer Films with perpendicular Magnetic Anisotropy for Memory Applications
Keywords: ferromagnetic resonance, magnetic fi lms, Co/Ni multilayers, CoFeB/MgO, damping, perpendicular magnetic anisotropy
Issue Date: 20-Aug-2014
Source: MARIA PATRICIA ROUELLI GARCIA SABINO (2014-08-20). Ferromagnetic Resonance Studies of Low Damping Multilayer Films with perpendicular Magnetic Anisotropy for Memory Applications. ScholarBank@NUS Repository.
Abstract: The key to further downscaling spintronic devices such as spin-transfer torque magnetoresistive random access memory (STT-MRAM) is the use of magnetic materials with perpendicular magnetic anisotropy (PMA). On top of this, the free layer needs to consist of a low damping ( α) material for high spin torque switching efficiency. In this thesis, vector network analyzer ferromagnetic resonance is used as the primary tool to investigate PMA systems with low damping, starting with a study of the intrinsic damping parameter α0 in Co/Ni multilayers and the first report of intrinsic damping measurements of a perpendicular CoFeB/MgO-based stack. Because α 0 in MgO/CoFeB/MgO ("double MgO") stacks are measured to be around 300% smaller than in Co/Ni multilayers, the double MgO system is further developed to exhibit large PMA via the insertion of ultrathin Ta layers into the CoFeB layer. Evidence of the non-proportional relationship between anisotropy and damping in the CoFeB/MgO system is then presented, and implications on the theoretical model of its perpendicular magnetic anisotropy are additionally explored.
Appears in Collections:Ph.D Theses (Open)

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