Strain-assisted magnetization reversal in Co/Ni multilayers with\n perpendicular magnetic anisotropy

2016/01/06 by Daniel B. Gopman, Gopman, Daniel B., Cindi L. Dennis +11 · 1 citation
Physics and Astronomy · Materials Science · #Magnetic properties of thin films #Multiferroics and related materials #Magnetic and transport properties of perovskites and related materials

paper · pdf · doi:10.48550/arxiv.1601.01349

Abstract

Multifunctional materials composed of ultrathin magnetic films with\nperpendicular magnetic anisotropy combined with ferroelectric substrates\nrepresent a new approach toward low power, fast, high density spintronics. Here\nwe demonstrate Co/Ni multilayered films with tunable saturation magnetization\nand perpendicular anisotropy grown directly on ferroelectric PZT\n[Pb(Zr_xTi₁-x)O₃] substrate plates. Electric fields up to +/- 2 MV/m expand\nthe PZT by 0.1% and generate at least 0.02% in-plane compression in the Co/Ni\nmultilayered film. Modifying the strain with a voltage can reduce the coercive\nfield by over 30%. We also demonstrate that alternating in-plane tensile and\ncompressive strains (less than 0.01%) can be used to propagate magnetic domain\nwalls. This ability to manipulate high anisotropy magnetic thin films could\nprove useful for lowering the switching energy for magnetic elements in future\nvoltage-controlled spintronic devices.\n

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