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Lengthscale Effects on Exchange Coupling in Co-Pt Ll0+Ll2 Nanochessboards



Eric P. Vetter, Liwei Geng, Priya Ghatwai, Dustin A. Gilbert, Yongmei Jin, William A. Soffa, Jerrold A. Floro


The Co-Pt nanochessboard is a quasi-periodic, nanocomposite tiling of Ll0 and Ll2 magnetic phases that offers a novel structure for the investigation of exchange coupling, relevant to permanent magnet applications. Periodicity of the tiling is controlled by the rate of cooling through the eutectoid isotherm, resulting in control over the Ll0-Ll2 exchange coupling. First order reversal curve analysis reveals a transition from two-phase, partial coupled reversal to nearly complete exchange-coupling in a Co40.2Pt59.8 nanochessboard structured alloy as the periodicity is reduced below the critical correlation length. Micromagnetic simulations give insights into how exchange coupling manifests in the tiling, and its impact on microscopic magnetization reversal mechanisms.
APL Materials


High Anisotropy, Composite, CoPt, Interactions, Metallurgy


Vetter, E. , Geng, L. , Ghatwai, P. , Gilbert, D. , Jin, Y. , Soffa, W. and Floro, J. (2016), Lengthscale Effects on Exchange Coupling in Co-Pt Ll<sub>0</sub>+Ll<sub>2</sub> Nanochessboards, APL Materials, [online], (Accessed July 20, 2024)


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Created August 31, 2016, Updated October 12, 2021